{"product_id":"organic-potato-fertiliser","title":"Organic Potato Fertiliser | Slow Release Feed","description":"\u003c!-- Dr Forest — Potato Fertiliser 3-5-8 eBay Listing --\u003e\u003c!-- Prefix: po — 6-tab layout --\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c!-- Pure CSS radio-input tabs. 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font-size: 0.92em; }\n  .drf-wrap table th { background: #1B3D2F; color: #fff; padding: 0.6em 0.8em; text-align: left; font-weight: 600; font-size: 0.85em; letter-spacing: 0.04em; text-transform: uppercase; }\n  .drf-wrap table td { padding: 0.5em 0.8em; border-bottom: 1px solid #d4cfc5; }\n  .drf-wrap table tr:nth-child(even) td { background: #f2f7f3; }\n\u003c\/style\u003e\n\u003cdiv class=\"drf-wrap\"\u003e\n\u003cdiv class=\"drf-tabs-wrap\"\u003e\n\u003cinput type=\"radio\" name=\"drf-po-tabset\" id=\"drf-po-tab1\" checked\u003e \u003cinput type=\"radio\" name=\"drf-po-tabset\" id=\"drf-po-tab2\"\u003e \u003cinput type=\"radio\" name=\"drf-po-tabset\" id=\"drf-po-tab3\"\u003e \u003cinput type=\"radio\" name=\"drf-po-tabset\" id=\"drf-po-tab4\"\u003e \u003cinput type=\"radio\" name=\"drf-po-tabset\" id=\"drf-po-tab5\"\u003e \u003cinput type=\"radio\" name=\"drf-po-tabset\" id=\"drf-po-tab6\"\u003e\n\u003cdiv class=\"drf-tab-labels\"\u003e\n\u003clabel for=\"drf-po-tab1\"\u003eOverview\u003c\/label\u003e \u003clabel for=\"drf-po-tab2\"\u003eIngredients\u003c\/label\u003e \u003clabel for=\"drf-po-tab3\"\u003eHow to Use\u003c\/label\u003e \u003clabel for=\"drf-po-tab4\"\u003eGrowing Guide\u003c\/label\u003e \u003clabel for=\"drf-po-tab5\"\u003eThe Science\u003c\/label\u003e \u003clabel for=\"drf-po-tab6\"\u003eFAQ\u003c\/label\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-panels\"\u003e\n\u003c!-- ═══════════ TAB 1 — OVERVIEW ═══════════ --\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-po-panel1\"\u003e\n\u003ch2\u003ePotato Fertiliser 3-5-8 — designed for starch, flavour and skin quality\u003c\/h2\u003e\n\u003cdiv class=\"drf-badge-row\"\u003e\n\u003cspan class=\"drf-badge drf-badge-green\"\u003e3-5-8 NPK\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003e20 Ingredients\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003eStarch \u0026amp; Flavour Led\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003eSlow Release\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003eNo Slaughterhouse Waste\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003eHandmade in the UK\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp\u003eThe potato is one of the most nutritionally demanding crops a home grower can grow — and one of the most rewarding when grown well. The \u003cstrong\u003e3-5-8 NPK ratio\u003c\/strong\u003e is built around what the peer-reviewed literature consistently identifies as decisive for tuber quality: \u003cstrong\u003epotassium dominant\u003c\/strong\u003e to drive starch accumulation, dry matter and flavour; \u003cstrong\u003eelevated phosphorus\u003c\/strong\u003e for tuber initiation and root development; nitrogen deliberately moderate to prevent the excess vegetative growth that diverts energy away from the crop underground.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTwenty ingredients\u003c\/strong\u003e including Yorkshire Polyhalite, Scottish Seaweed, Phosphorous Meal, Gypsum, Mealworm Frass, EM-1 Microorganisms and Fermented Biochar deliver a complete slow-release feed with \u003cstrong\u003e7% calcium\u003c\/strong\u003e from four sources for skin quality and disease suppression, and a K:N ratio exceeding 2.5:1. Handcrafted in Stockport — no slaughterhouse waste.\u003c\/p\u003e\n\u003cdiv class=\"drf-stats\"\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e3-5-8\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eNPK Ratio\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e7%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eCalcium (4 sources)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e2.4%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eMagnesium (3 sources)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e2.7:1\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eK:N Ratio\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWhat this formula does for your potatoes\u003c\/h3\u003e\n\u003cul class=\"drf-uses\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigher starch, deeper flavour\u003c\/strong\u003e — chloride-free potassium at 8% activates starch synthase and drives sugar-to-starch conversion in bulking tubers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMore tubers, better set\u003c\/strong\u003e — elevated phosphorus from Phosphorous Meal and Micronised Rock Phosphate drives stolon elongation and tuber initiation in the critical 4–8 week window\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClean skin, less scab\u003c\/strong\u003e — sulphur from Yorkshire Polyhalite and Gypsum suppresses \u003cem\u003eStreptomyces scabies\u003c\/em\u003e; Silica Meal strengthens the tuber periderm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLower nitrate in tubers\u003c\/strong\u003e — moderate organic nitrogen produces 30–50% lower nitrate than mineral-fed tubers with cleaner taste and longer storage life\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLiving soil biology\u003c\/strong\u003e — EM-1 Microorganisms and chitin from Mealworm Frass activate systemic acquired resistance and suppress soil-borne pathogens\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrace mineral depth\u003c\/strong\u003e — Scottish Seaweed, Volcanic Rock Dust and Clay Minerals supply the enzyme cofactors for volatile aroma compounds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eDr Forest Potato vs liquid potato feed\u003c\/h3\u003e\n\u003cdiv class=\"drf-compare\"\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eDr Forest Potato Fertiliser 3-5-8\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e20 ingredients — 7% Ca, 2.4% Mg and broad trace minerals\u003c\/li\u003e\n\u003cli\u003eChloride-free potassium only — chloride suppresses starch synthesis\u003c\/li\u003e\n\u003cli\u003eSlow-release organic fractions feed for weeks per application\u003c\/li\u003e\n\u003cli\u003eEvery application permanently improves soil structure and biology\u003c\/li\u003e\n\u003cli\u003eSulphur supply suppresses common scab\u003c\/li\u003e\n\u003cli\u003eApply at planting and earthing up — not weekly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eTypical Liquid Potato Feed\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e3 nutrients — NPK and nothing else\u003c\/li\u003e\n\u003cli\u003eOften contains muriate of potash — actively suppresses starch\u003c\/li\u003e\n\u003cli\u003eNo calcium, no sulphur, no trace minerals\u003c\/li\u003e\n\u003cli\u003eFeast-and-famine cycle — leaches before tubers utilise it\u003c\/li\u003e\n\u003cli\u003eAdds nothing to soil structure or biology\u003c\/li\u003e\n\u003cli\u003eWeekly dosing required throughout the season\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-callout\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eHandcrafted in Stockport\u003c\/span\u003e\n\u003cp\u003eDr Forest fertilisers are blended in small batches from traceable British ingredients. Named after Joe's grandfather — an NHS GP who believed in doing things properly. No slaughterhouse waste. No shortcuts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ═══════════ TAB 2 — INGREDIENTS ═══════════ --\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-po-panel2\"\u003e\n\u003ch2\u003eAll 20 ingredients — what they do and why they are in the formula\u003c\/h2\u003e\n\u003cp\u003eEvery ingredient is here for a specific, research-backed reason. Nothing is filler. The potassium mineral is mined in North Yorkshire. The seaweed is hand-harvested from Scottish waters. The biochar is British-sourced and fermented before blending.\u003c\/p\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e01\u003c\/span\u003e\n\u003ch4\u003eNitrogen Plant Extract — Plant-derived, controlled release\u003c\/h4\u003e\n\u003cp\u003ePrimary nitrogen carrier at 12% N. Mineralises over 6–8 weeks without nitrate spikes. A nitrogen spike during bulking redirects energy into haulm at the expense of starch accumulation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e02\u003c\/span\u003e\n\u003ch4\u003ePhosphorous Meal — Heat-treated plant meal, fast-moderate release\u003c\/h4\u003e\n\u003cp\u003eHeat treatment dramatically increases P availability. At 15% P and 9% Ca, this is the primary fast-acting P source for stolon elongation and tuber initiation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e03\u003c\/span\u003e\n\u003ch4\u003eSulphate of Potash (SOP) — Mineral, immediate release\u003c\/h4\u003e\n\u003cp\u003eFast-acting potassium at 50% K₂O — chloride-free. Activates starch synthase and drives sugar-to-starch conversion immediately. No muriate forms anywhere in this formula.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e04\u003c\/span\u003e\n\u003ch4\u003eGypsum (Calcium Sulphate) — Mineral, immediate release\u003c\/h4\u003e\n\u003cp\u003e23.3% calcium and 18.6% sulphur in immediately plant-available sulphate form. Strengthens cell walls and tuber skin. Sulphur acidifies the rhizosphere to suppress common scab.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e05\u003c\/span\u003e\n\u003ch4\u003eMicronised Magnesium Mineral — Mineral, sustained release\u003c\/h4\u003e\n\u003cp\u003e20.9% Mg at 5-micron particle size. The central atom of every chlorophyll molecule — without it, photosynthesis fails and carbohydrate transport to tubers stalls.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e06\u003c\/span\u003e\n\u003ch4\u003eYorkshire Polyhalite — North Yorkshire, slow release 50–60 days\u003c\/h4\u003e\n\u003cp\u003eK, Ca, Mg and S from a single crystal. Mined 1,200m below the North Sea. Extends K supply by 50–60 days after SOP's immediate release is exhausted. Sulphur increases dry matter and suppresses scab.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e07\u003c\/span\u003e\n\u003ch4\u003eAlfalfa Meal — Plant-based, slow release, biostimulant\u003c\/h4\u003e\n\u003cp\u003eContains triacontanol — increases chlorophyll content by 15–20%. More photosynthate means more sucrose available for starch conversion in developing tubers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e08\u003c\/span\u003e\n\u003ch4\u003eMicronised Rock Phosphate — Mineral, slow reserve\u003c\/h4\u003e\n\u003cp\u003e31% P and 49% Ca. Dissolves slowly as long-term reserve. Handles the final stretch when tubers are still bulking in August.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e09\u003c\/span\u003e\n\u003ch4\u003eMagnesium Carbonate — Mineral, moderate release\u003c\/h4\u003e\n\u003cp\u003eThe fastest-acting of the three Mg sources at 20% Mg. Dissolves within weeks in moist soil, providing early-season correction while Micronised Magnesium Mineral and Yorkshire Polyhalite build through the season.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e10\u003c\/span\u003e\n\u003ch4\u003eScottish Seaweed Meal — Hand-harvested\u003c\/h4\u003e\n\u003cp\u003eOver 60 trace elements. Natural cytokinins delay haulm senescence. Alginates improve soil structure and moisture retention in the tuber development zone.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e11\u003c\/span\u003e\n\u003ch4\u003eRapeseed Meal — British, slow release\u003c\/h4\u003e\n\u003cp\u003eSteady nitrogen over 6–8 weeks through microbial breakdown. Acts as a prebiotic carbon source. Gradual mineralisation avoids nitrate spikes that suppress starch.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e12\u003c\/span\u003e\n\u003ch4\u003eMealworm Frass — Sustainably reared, SAR activator\u003c\/h4\u003e\n\u003cp\u003eContains chitin. Plants detect it as a pest signal and upregulate Systemic Acquired Resistance, priming defences against Pythium, Rhizoctonia and other potato pathogens.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e13\u003c\/span\u003e\n\u003ch4\u003eHumic Acid \u0026amp; Fulvic Acid — Mineral organic, chelation\u003c\/h4\u003e\n\u003cp\u003eChelates micronutrients, increases soil bacterial biomass by 30–60%, stimulates mycorrhizal colonisation by 25–40%. Fulvic acid increases nutrient uptake during rapid bulking.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e14\u003c\/span\u003e\n\u003ch4\u003eFermented Biochar — British, activated\u003c\/h4\u003e\n\u003cp\u003ePermanent porous carbon scaffold. Increases K retention by 18–35% under leaching conditions — particularly valuable in potato beds where earthing up and watering leach soluble nutrients.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e15\u003c\/span\u003e\n\u003ch4\u003eClay Minerals — British, permanent CEC reservoir\u003c\/h4\u003e\n\u003cp\u003eMontmorillonite and illite clays. Ionic reservoirs that bind and slowly release K, Ca and Mg. Valuable in the light or sandy soils where potatoes are commonly grown.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e16\u003c\/span\u003e\n\u003ch4\u003eSeaweed Extracts — British coastal, biostimulant\u003c\/h4\u003e\n\u003cp\u003eConcentrated cytokinins, betaines for drought tolerance, and mannitol for beneficial rhizobacteria. Enhances nutrient uptake and tuber set.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e17\u003c\/span\u003e\n\u003ch4\u003eVolcanic Rock Dust (Basalt) — Mineral, trace elements\u003c\/h4\u003e\n\u003cp\u003eZinc, iron, copper, manganese — the enzyme cofactors for volatile aroma compounds that give well-grown potatoes their characteristic earthy depth.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e18\u003c\/span\u003e\n\u003ch4\u003eEM-1 Microorganisms — Living culture\u003c\/h4\u003e\n\u003cp\u003eBacteria, yeasts, actinomycetes and lactic acid bacteria. Suppresses pathogens, accelerates organic matter decomposition, builds the diverse rhizosphere that keeps scab in check.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e19\u003c\/span\u003e\n\u003ch4\u003eSilica Meal — Mineral, structural\u003c\/h4\u003e\n\u003cp\u003eSilicon strengthens the tuber periderm — improving skin finish, reducing scab damage and increasing storage life. Also a physical barrier against pest damage and fungal penetration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e20\u003c\/span\u003e\n\u003ch4\u003eHerbal Mixture — Plant-derived, biostimulant\u003c\/h4\u003e\n\u003cp\u003eComfrey (K-rich), nettle (iron, silica), yarrow (phosphorus-solubilising bacteria), chamomile (rhizobacteria support). Broad-spectrum biological stimulus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ═══════════ TAB 3 — HOW TO USE ═══════════ --\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-po-panel3\"\u003e\n\u003ch2\u003eHow to use: rates, timing \u0026amp; method\u003c\/h2\u003e\n\u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eBefore you start\u003c\/span\u003e\n\u003cp\u003eThis product is a \u003cstrong\u003emilled powder with a bulk density of 1 g\/ml\u003c\/strong\u003e — grams and millilitres are interchangeable. \u003cstrong\u003eNever apply in direct contact with seed tubers\u003c\/strong\u003e — always mix into surrounding soil with a 10 cm gap. Water thoroughly after application. For best results, mix 1:1 with compost before applying.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eStep-by-step: containers and grow bags\u003c\/h3\u003e\n\u003col class=\"drf-steps\"\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrepare your compost.\u003c\/strong\u003e 5–7.5g per litre. Mix thoroughly. 5g\/L for enriched compost; 7.5g\/L for plain or peat-free mixes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFill and plant.\u003c\/strong\u003e Half depth of prepared compost. Seed tuber eyes upward. Cover with 10–15cm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEarth up as shoots emerge.\u003c\/strong\u003e When 10–15cm tall, add compost leaving 5cm exposed. Add 1.5–2.5g per litre of added compost.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContinue until full.\u003c\/strong\u003e Include top-dress dose each time. Once full, switch to surface top-dressing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSurface top-dress every 3–4 weeks.\u003c\/strong\u003e 1.5–2.5g per litre of container volume. 10cm from stem. Scratch in and water.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMonitor plant signals.\u003c\/strong\u003e Very dark haulm, few flowers: stretch to 5–6 weeks. Pale lower leaves from midsummer: normal remobilisation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003chr class=\"drf-sep\"\u003e\n\u003ch3\u003eApplication rates\u003c\/h3\u003e\n\u003ch4\u003eContainers, grow bags \u0026amp; pots\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSituation\u003c\/th\u003e\n\u003cth\u003eRate (g = ml)\u003c\/th\u003e\n\u003cth\u003eFrequency\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePotting mix preparation\u003c\/td\u003e\n\u003ctd\u003e5–7.5g per litre\u003c\/td\u003e\n\u003ctd\u003eOnce at planting\u003c\/td\u003e\n\u003ctd\u003e5g\/L enriched mixes. 7.5g\/L plain or peat-free.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContainer top-dressing\u003c\/td\u003e\n\u003ctd\u003e1.5–2.5g per litre of pot volume\u003c\/td\u003e\n\u003ctd\u003eEvery 3–4 weeks\u003c\/td\u003e\n\u003ctd\u003e1.5g\/L earlies. 2–2.5g\/L maincrops.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch4\u003eOutdoor beds, raised beds \u0026amp; allotments\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSituation\u003c\/th\u003e\n\u003cth\u003eRate (g = ml)\u003c\/th\u003e\n\u003cth\u003eFrequency\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInitial soil preparation\u003c\/td\u003e\n\u003ctd\u003e125–175g per m²\u003c\/td\u003e\n\u003ctd\u003eOnce before planting\u003c\/td\u003e\n\u003ctd\u003eFork into top 15–20cm. 175g\/m² for depleted beds.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutdoor top-dressing\u003c\/td\u003e\n\u003ctd\u003e100–150g per m²\u003c\/td\u003e\n\u003ctd\u003eEvery 3–4 weeks\u003c\/td\u003e\n\u003ctd\u003e100g\/m² earlies. 150g\/m² maincrops through bulking.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle plant at planting\u003c\/td\u003e\n\u003ctd\u003e30–45g per plant\u003c\/td\u003e\n\u003ctd\u003eOnce at planting\u003c\/td\u003e\n\u003ctd\u003eMix into planting hole. 10cm gap from tuber.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle plant top-dressing\u003c\/td\u003e\n\u003ctd\u003e20–35g per plant\u003c\/td\u003e\n\u003ctd\u003eEvery 3–4 weeks\u003c\/td\u003e\n\u003ctd\u003eRing 10–15cm from stem. Time with earthing up.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr class=\"drf-sep\"\u003e\n\u003ch3\u003eSeasonal feeding guide\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eStage\u003c\/th\u003e\n\u003cth\u003eTiming\u003c\/th\u003e\n\u003cth\u003eRate \u0026amp; Frequency\u003c\/th\u003e\n\u003cth\u003eGoal\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBed \/ container prep\u003c\/td\u003e\n\u003ctd\u003e2–4 weeks before planting\u003c\/td\u003e\n\u003ctd\u003eBeds: 125–175g\/m². Pots: 5–7.5g\/L\u003c\/td\u003e\n\u003ctd\u003eBuild nutrient-rich root zone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAt planting\u003c\/td\u003e\n\u003ctd\u003eAt time of planting\u003c\/td\u003e\n\u003ctd\u003e30–45g per planting position\u003c\/td\u003e\n\u003ctd\u003eLocalised nutrition for emerging stolons\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFirst earthing up\u003c\/td\u003e\n\u003ctd\u003e3–4 weeks after emergence\u003c\/td\u003e\n\u003ctd\u003eBeds: 100–150g\/m². Pots: 1.5–2.5g\/L\u003c\/td\u003e\n\u003ctd\u003eK and P into tuber initiation zone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eActive bulking\u003c\/td\u003e\n\u003ctd\u003e4–6 weeks after tuber initiation\u003c\/td\u003e\n\u003ctd\u003eSame, every 3–4 weeks\u003c\/td\u003e\n\u003ctd\u003eSustained K for starch accumulation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRipening \u0026amp; curing\u003c\/td\u003e\n\u003ctd\u003eHaulm yellowing\u003c\/td\u003e\n\u003ctd\u003eStop or single low-rate application\u003c\/td\u003e\n\u003ctd\u003eAllow skin set; excess N reduces storage life\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv class=\"drf-callout\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eWorks well combined with…\u003c\/span\u003e\n\u003cp\u003eUse \u003cstrong\u003eDr Forest Seaweed Powder\u003c\/strong\u003e as a fortnightly foliar. Apply \u003cstrong\u003eDr Forest Liquid Gypsum\u003c\/strong\u003e as a root drench for additional calcium during tuber initiation. Use the \u003cstrong\u003eDr Forest All-Purpose 6-6-6\u003c\/strong\u003e for companion plantings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eStorage\u003c\/span\u003e\n\u003cp\u003eCool, dry place out of direct sunlight. Keep sealed. Effective for at least 18 months.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ═══════════ TAB 4 — GROWING GUIDE ═══════════ --\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-po-panel4\"\u003e\n\u003ch2\u003ePotato growing guide — varieties, chitting, earthing up \u0026amp; feeding by type\u003c\/h2\u003e\n\u003cp\u003eNot all potatoes grow the same way. This guide covers the practical differences between variety types grown in the UK — and how to adjust your fertiliser programme to get the best from each one.\u003c\/p\u003e\n\u003ch3\u003eFeeding adjustments by variety type\u003c\/h3\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eFirst earlies — Rocket, Swift, Casablanca, Lady Christl, Pentland Javelin\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e Lower end of range  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Every 4 weeks  |  \u003cstrong\u003eTop-dresses:\u003c\/strong\u003e 1–2 max\u003c\/div\u003e\n\u003cp\u003eShort season (10–12 weeks). Full base dressing, then 1 top-dress at first earthing up. A second only if the season is long. Earlies are harvested before full starch accumulation — they are valued for thin skins and fresh, waxy texture. Lower K demand than maincrops.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eSecond earlies \u0026amp; salad — Charlotte, Anya, Nicola, Kestrel, International Kidney (Jersey Royal)\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e Lower to mid-range  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Every 3–4 weeks  |  \u003cstrong\u003eTop-dresses:\u003c\/strong\u003e 1–2\u003c\/div\u003e\n\u003cp\u003eWaxy varieties bred for firm texture and buttery flavour. The 3-5-8 formula's K emphasis improves sugar content and skin quality without pushing starch so high it changes the waxy character. Moderate feeding. Harvest when haulm just begins to yellow.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eFloury maincrops — King Edward, Maris Piper, Rooster, Kerr's Pink, Golden Wonder\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e Upper end of range  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Every 3 weeks at peak  |  \u003cstrong\u003eTop-dresses:\u003c\/strong\u003e 2–3\u003c\/div\u003e\n\u003cp\u003eThe varieties where the 3-5-8 formula makes the most dramatic difference. Floury varieties are genetically programmed for high starch — but that potential is only realised with sustained potassium throughout the extended bulking period. Full programme. Upper rates. This is what the formula was designed for.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eAll-rounders — Desiree, Cara, Sarpo Mira, Wilja, Estima\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e Mid-range  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Every 3–4 weeks  |  \u003cstrong\u003eTop-dresses:\u003c\/strong\u003e 2–3\u003c\/div\u003e\n\u003cp\u003eVersatile varieties that respond well to standard rates. Sarpo Mira has exceptional blight resistance and benefits from the full maincrop programme. Desiree's red skin colour intensifies with adequate potassium and the anthocyanin support from the trace mineral profile.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eHeritage \u0026amp; specialist — Pink Fir Apple, Shetland Black, Highland Burgundy Red, Ratte, Salad Blue\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e Mid-range  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Every 3–4 weeks  |  \u003cstrong\u003eTop-dresses:\u003c\/strong\u003e 2–3\u003c\/div\u003e\n\u003cp\u003eHeritage varieties retain genetic capacity for complex flavour and respond more dramatically to organic feeding than modern commercial types. The volatile aroma compounds and anthocyanin pigments that make these varieties special are produced more abundantly under K-rich organic nutrition. Worth the extra attention.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003chr class=\"drf-sep\"\u003e\n\u003ch3\u003eContainers vs beds\u003c\/h3\u003e\n\u003cdiv class=\"drf-compare\"\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eContainers, grow bags \u0026amp; patio pots\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eBest for first and second earlies — shorter varieties, faster harvest\u003c\/li\u003e\n\u003cli\u003eLimited compost volume means nutrients leach faster — biochar and clay minerals in the formula help\u003c\/li\u003e\n\u003cli\u003eEarth up by adding compost layers as shoots grow\u003c\/li\u003e\n\u003cli\u003eWater daily in warm weather — consistent moisture prevents scab and hollow heart\u003c\/li\u003e\n\u003cli\u003eFeed at every earthing up, then surface top-dress every 3–4 weeks\u003c\/li\u003e\n\u003cli\u003eDrain freely — waterlogging rots tubers\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eOutdoor beds, raised beds \u0026amp; allotments\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eFull range of varieties — earlies through to late maincrops\u003c\/li\u003e\n\u003cli\u003eLarger soil volume buffers nutrients and moisture better\u003c\/li\u003e\n\u003cli\u003eEarth up by drawing soil from between rows\u003c\/li\u003e\n\u003cli\u003eWater deeply 2–3 times per week rather than little and often\u003c\/li\u003e\n\u003cli\u003eMulch after final earthing up to conserve moisture and suppress weeds\u003c\/li\u003e\n\u003cli\u003eRotate — never grow potatoes in the same bed two years running\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr class=\"drf-sep\"\u003e\n\u003ch3\u003eChitting — do you need to?\u003c\/h3\u003e\n\u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eChitting is optional but valuable for earlies\u003c\/span\u003e\n\u003cp\u003eChitting (pre-sprouting) gives first and second earlies a 2–3 week head start. It is less important for maincrops — some growers skip it entirely for late varieties. If you chit: stand tubers upright in egg boxes in a cool (8–10°C), bright room from late January. Plant when sprouts are 1.5–2.5cm long. Do not let sprouts exceed 3cm — they become fragile and snap during planting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003chr class=\"drf-sep\"\u003e\n\u003ch3\u003eEarthing up — why it matters\u003c\/h3\u003e\n\u003col class=\"drf-steps\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eTriggers stolon formation.\u003c\/strong\u003e Burying the base of the stem stimulates the plant to produce the underground lateral stems from which tubers develop. More earthing up = more potential tuber sites.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrevents greening.\u003c\/strong\u003e Tubers exposed to light produce solanine — toxic and bitter. Earthing up keeps developing tubers in darkness.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDelivers fertiliser to the stolon zone.\u003c\/strong\u003e Apply your top-dress dose just before or during earthing up. The fresh soil drawn over the fertiliser creates the ideal microbial breakdown environment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhen to earth up.\u003c\/strong\u003e First time: when shoots reach 15–20cm. Second time: 2–3 weeks later when shoots re-emerge. Container growers: add compost layers instead of drawing soil.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003chr class=\"drf-sep\"\u003e\n\u003ch3\u003eUK seasonal timeline\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMonth\u003c\/th\u003e\n\u003cth\u003eWhat to Do\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJan–Feb\u003c\/td\u003e\n\u003ctd\u003eChit early varieties in egg boxes. 8–10°C, bright but not direct sun. Order seed tubers early — popular varieties sell out.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMarch\u003c\/td\u003e\n\u003ctd\u003ePrepare beds: fork in 125–175g\/m² base dressing 2–4 weeks before planting. Plant first earlies mid-March in mild areas; late March elsewhere.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApril\u003c\/td\u003e\n\u003ctd\u003ePlant second earlies and maincrops. 30–45g per planting hole. Prepare containers with 5–7.5g\/L charged compost.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMay\u003c\/td\u003e\n\u003ctd\u003eFirst earthing up when shoots reach 15–20cm. Apply first top-dress (100–150g\/m²) during earthing up. Keep soil moist.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJune\u003c\/td\u003e\n\u003ctd\u003eSecond earthing up. Continue top-dressing every 3–4 weeks. Earlies: harvest when flowers open or haulm begins to yellow. Consistent watering critical for scab prevention.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJuly\u003c\/td\u003e\n\u003ctd\u003eHarvest first and second earlies. Maincrops in active bulking — feed at upper end every 3 weeks. Monitor for blight in warm, humid weather.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAugust\u003c\/td\u003e\n\u003ctd\u003eFinal top-dress for maincrops. Reduce watering slightly in the last 2 weeks to concentrate starch and dry matter. Cut haulm if blight appears.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSep–Oct\u003c\/td\u003e\n\u003ctd\u003eHarvest maincrops on a dry day. Cure on soil surface for 1–2 hours. Store in cool, dark, ventilated conditions. Pull spent haulm and compost (unless blighted).\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr class=\"drf-sep\"\u003e\n\u003ch3\u003eCommon problems\u003c\/h3\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eCommon scab\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eCause:\u003c\/strong\u003e \u003cem\u003eStreptomyces scabies\u003c\/em\u003e in alkaline, dry, biologically poor soil\u003c\/div\u003e\n\u003cp\u003eThe sulphur, silica and EM-1 in this formula directly address all three risk factors. Consistent watering during weeks 2–6 after tuber initiation is the single most important non-fertiliser intervention. Do not lime before potatoes. Choose scab-resistant varieties (Cara, Sarpo Mira, Kestrel) if your soil is prone.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eBlight (Phytophthora infestans)\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eCause:\u003c\/strong\u003e Fungal spores spread in warm, humid, wet conditions — typically July–August\u003c\/div\u003e\n\u003cp\u003eNo fertiliser prevents blight — it is an airborne fungal disease. Choose blight-resistant varieties for outdoor growing (Sarpo Mira, Sarpo Axona, Carolus). Monitor the Hutton Criteria blight forecast. Cut haulm at ground level immediately if blight appears. Do not compost blighted foliage. Tubers below ground are usually safe if haulm is removed promptly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eHollow heart\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eCause:\u003c\/strong\u003e Rapid, uneven growth — typically from erratic watering or excess nitrogen\u003c\/div\u003e\n\u003cp\u003eThe moderate 3% N in the formula prevents the growth surges that cause hollow heart. Consistent watering and even fertiliser distribution are the prevention. Most common in large-tubered varieties (King Edward, Maris Piper) during rapid bulking.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eGreening (solanine formation)\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eCause:\u003c\/strong\u003e Tubers exposed to light during growth or after harvest\u003c\/div\u003e\n\u003cp\u003eThorough earthing up is the prevention. The stronger periderm from Silica Meal and calcium slows light penetration, but physical coverage is essential. After harvest: store immediately in darkness. Green potatoes should not be eaten.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eSlug damage\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eCause:\u003c\/strong\u003e Slugs tunnelling into tubers — especially in wet conditions and heavy soils\u003c\/div\u003e\n\u003cp\u003eHarvest earlies promptly. For maincrops, harvest before autumn rains intensify. Choose slug-resistant varieties (Sarpo Mira, Cara, Kestrel). Organic slug pellets around the base of the earthed-up ridge are effective. The strong skin structure from calcium and silica provides some resistance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eBlackleg\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eCause:\u003c\/strong\u003e Bacterial infection (\u003cem\u003ePectobacterium\u003c\/em\u003e) from infected seed tubers or waterlogged soil\u003c\/div\u003e\n\u003cp\u003eBuy certified seed tubers. Ensure good drainage. Do not overwater. Remove and destroy affected plants immediately — do not compost. The competitive microbial community from EM-1, biochar and humic acid provides some suppression but cannot overcome infected seed stock.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ═══════════ TAB 5 — THE SCIENCE ═══════════ --\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-po-panel5\"\u003e\n\u003ch2\u003eThe science of potato flavour, starch and why nutrition is decisive\u003c\/h2\u003e\n\u003cp\u003ePotato flavour combines four systems: \u003cstrong\u003estarch\u003c\/strong\u003e (texture and body), \u003cstrong\u003esugars\u003c\/strong\u003e (sweetness and Maillard browning), \u003cstrong\u003eamino acids\u003c\/strong\u003e (Strecker degradation volatiles), and \u003cstrong\u003eVOCs\u003c\/strong\u003e (earthy, nutty aroma). All four are profoundly influenced by nutrition.\u003c\/p\u003e\n\u003cdiv class=\"drf-stats\"\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003eN 3%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003ePrevents dilution\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003eP 5%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eTuber set\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003eK 8%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eStarch \u0026amp; dry matter\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003eCa 7%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eSkin \u0026amp; scab defence\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr class=\"drf-sep\"\u003e\n\u003ch3\u003eWhy 3-5-8\u003c\/h3\u003e\n\u003cp\u003ePotato NPK uptake approximates 1 : 0.25 : 1.4–1.5. The 3-5-8 ratio delivers K:N of 2.7:1 — firmly in the range where potassium dominates starch synthase activation, sugar-to-starch conversion and carbohydrate transport into developing tubers.\u003c\/p\u003e\n\u003ch3\u003eWhy sulphate, not muriate\u003c\/h3\u003e\n\u003cp\u003eThe chloride ion in muriate of potash inhibits starch synthase. SOP and polyhalite deliver potassium as sulphate — promoting maximum starch accumulation. No chloride anywhere in the formula.\u003c\/p\u003e\n\u003chr class=\"drf-sep\"\u003e\n\u003ch3\u003eMechanisms of action\u003c\/h3\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e01\u003c\/span\u003e\n\u003ch4\u003eStarch accumulation via potassium\u003c\/h4\u003e\n\u003cp\u003eK activates starch synthase and drives phloem loading of sucrose into developing tubers. Chloride-free K from SOP (immediate) and Polyhalite (50–60 day sustained).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e02\u003c\/span\u003e\n\u003ch4\u003eLow nitrogen preserves flavour\u003c\/h4\u003e\n\u003cp\u003eExcess N produces watery tubers with low starch, elevated nitrate and bitter taste. 3% N through slow organic mineralisation prevents this.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e03\u003c\/span\u003e\n\u003ch4\u003eDual-speed phosphorus for tuber set\u003c\/h4\u003e\n\u003cp\u003ePhosphorous Meal for early demand; Micronised Rock Phosphate for months-long reserve. Undersupplied P is one of the most common causes of poor set.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e04\u003c\/span\u003e\n\u003ch4\u003eDisease suppression and skin quality\u003c\/h4\u003e\n\u003cp\u003eSulphur acidifies the rhizosphere and suppresses \u003cem\u003eStreptomyces\u003c\/em\u003e — reducing scab 30–60%. Silica strengthens the periderm. EM-1 and chitin build competitive microbial communities.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e05\u003c\/span\u003e\n\u003ch4\u003eMicrobial metabolites and flavour\u003c\/h4\u003e\n\u003cp\u003eDecomposing organic ingredients generate secondary metabolites that directly influence volatile aroma biosynthesis. Biologically active soil produces higher methional and hexanal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e06\u003c\/span\u003e\n\u003ch4\u003e7% calcium from four sources\u003c\/h4\u003e\n\u003cp\u003eGypsum (immediate), Phosphorous Meal (9% Ca), Micronised Rock Phosphate (49% Ca, slow), Yorkshire Polyhalite (17% Ca, sustained). Continuous availability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003chr class=\"drf-sep\"\u003e\n\u003ch3\u003eStudy data\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eStudy\u003c\/th\u003e\n\u003cth\u003eFinding\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField trials incl. Impala (2020–2024)\u003c\/td\u003e\n\u003ctd\u003eOrganic: dry matter +10–15%, starch +15–30%. Nitrate below permissible norms.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBiofertiliser trials (2023–2024)\u003c\/td\u003e\n\u003ctd\u003eOrganic NPK + biologicals: yield +104%, starch +79%. Low-N, high P\/K outperformed high-N.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlobal meta-analysis (2023)\u003c\/td\u003e\n\u003ctd\u003eCombined NPK + organic: yield +31%, nutritional quality +12–30%.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eK and starch synthesis\u003c\/td\u003e\n\u003ctd\u003eOptimal K:N 1.5–2.5:1. SOP better than muriate for starch and cooking quality.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSulphur and scab\u003c\/td\u003e\n\u003ctd\u003eSulphur (incl. polyhalite) reduced scab 30–60%.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrganic matter and flavour VOCs\u003c\/td\u003e\n\u003ctd\u003eHigher methional, 2-ethyl-1-hexanol, hexanal across all cooking methods.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv class=\"drf-refs\"\u003e\n\u003ch4\u003eReferences\u003c\/h4\u003e\n\u003col\u003e\n\u003cli\u003eHopkins, B.G. et al. (2010). Potato nutrition and quality. \u003cem\u003eAmerican Journal of Potato Research\u003c\/em\u003e.\u003c\/li\u003e\n\u003cli\u003eLal, M.K. et al. (2022). Starch biosynthesis in potato. \u003cem\u003eCarbohydrate Polymers\u003c\/em\u003e.\u003c\/li\u003e\n\u003cli\u003eKlikocka, H. et al. (2016). Sulphur and nitrogen effects on potato tuber amino acids. \u003cem\u003eJournal of Elementology\u003c\/em\u003e.\u003c\/li\u003e\n\u003cli\u003eWang, Y. et al. (2023). Combined organic–mineral meta-analysis. \u003cem\u003eScience of the Total Environment\u003c\/em\u003e.\u003c\/li\u003e\n\u003cli\u003eLeake, A.R. (2003). Organic and conventionally grown potatoes. \u003cem\u003eAspects of Applied Biology\u003c\/em\u003e.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ═══════════ TAB 6 — FAQ ═══════════ --\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-po-panel6\"\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-po-faq1\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-po-faq1\"\u003eMy potatoes always get common scab. Will this help?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eYes — sulphur from Yorkshire Polyhalite and Gypsum acidifies the rhizosphere to suppress \u003cem\u003eStreptomyces\u003c\/em\u003e. Silica Meal strengthens the tuber skin. EM-1 and chitin from Mealworm Frass build competitive biology. Combine with consistent watering during weeks 2–6 after tuber initiation.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-po-faq2\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-po-faq2\"\u003eWhy more phosphorus than most potato feeds?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eTuber set is phosphorus-driven. If P is limiting during the 4–8 week window after emergence, tuber number is permanently reduced. Phosphorous Meal and Micronised Rock Phosphate at different speeds ensure unbroken P supply.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-po-faq3\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-po-faq3\"\u003eLush haulm but few flowers — what should I do?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eExcess nitrogen relative to potassium. Skip the next top-dress, reduce rates and stretch to 5–6 weeks. Common in recently manured soil.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-po-faq4\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-po-faq4\"\u003eCan I use this in grow bags with pre-fertilised compost?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eYes — use 5g\/L rather than 7.5g\/L for the initial mix. Begin top-dressing at 6–8 weeks rather than immediately at first earthing up.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-po-faq5\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-po-faq5\"\u003eDo I need different rates for earlies vs maincrops?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eYes — see the Growing Guide tab. Earlies: lower rates, 1–2 top-dresses. Maincrops: upper rates, 2–3 top-dresses through bulking. Same base dressing for both.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-po-faq6\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-po-faq6\"\u003eWhy sulphate of potash and not muriate?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eThe chloride ion in muriate inhibits starch synthase. SOP and polyhalite deliver potassium as sulphate, promoting maximum starch. No chloride anywhere in this formula.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-po-faq7\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-po-faq7\"\u003eIs it suitable for sweet potatoes?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eThe high K and moderate N suits sweet potato nutrition broadly. Use lower rates. The formula was specifically designed for \u003cem\u003eSolanum tuberosum\u003c\/em\u003e.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-po-faq8\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-po-faq8\"\u003eIs it safe for edible crops, pets and children?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eYes. Organic and mineral ingredients, no synthetic chemicals, no slaughterhouse by-products, no persistent toxins. No withholding period.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-po-faq9\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-po-faq9\"\u003eIs it organic?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eMade from organic and natural ingredients. Not certified organic. No synthetic chemicals, no slaughterhouse waste, no GMO inputs.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-po-faq10\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-po-faq10\"\u003eHow should I store harvested potatoes?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eCure 1–2 hours on harvest day. Store at 4–8°C in darkness with ventilation. Hessian sacks or wooden boxes. Never plastic. Maincrops store for months; earlies eat within weeks.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Dr Forest","offers":[{"title":"1.5kg (750gx2)","offer_id":57049795690870,"sku":null,"price":12.0,"currency_code":"GBP","in_stock":true},{"title":"4kg","offer_id":57049795723638,"sku":null,"price":24.0,"currency_code":"GBP","in_stock":true},{"title":"9kg","offer_id":57049795756406,"sku":null,"price":44.0,"currency_code":"GBP","in_stock":true},{"title":"15kg","offer_id":57049795789174,"sku":null,"price":60.49,"currency_code":"GBP","in_stock":true},{"title":"30kg","offer_id":57049795821942,"sku":null,"price":120.0,"currency_code":"GBP","in_stock":true},{"title":"60kg","offer_id":57049795854710,"sku":null,"price":240.0,"currency_code":"GBP","in_stock":true},{"title":"120kg","offer_id":57049795887478,"sku":null,"price":420.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0049\/8194\/8504\/files\/premium-potato-fertiliser-slow-release-plant-food-high-yield-797.webp?v=1772229972","url":"https:\/\/www.drforest.co.uk\/products\/organic-potato-fertiliser","provider":"Dr Forest","version":"1.0","type":"link"}