{"product_id":"organic-potassium-fertiliser","title":"Organic Potassium Fertiliser UK | 11% K Solution Grade","description":"\u003c!-- Dr Forest — Micro-K Micronised Potassium Product Page --\u003e\n\u003c!-- Prefix: mk --\u003e\n\u003cstyle\u003e\n  .drf-wrap *, .drf-wrap *::before, .drf-wrap *::after { box-sizing: border-box; margin: 0; padding: 0; }\n  .drf-wrap { font-family: 'Jost', sans-serif; font-weight: 400; color: #2c2c2c; font-size: 14px; line-height: 1.65; width: 100%; max-width: 100%; overflow: hidden; }\n  :root { --drf-grn:#1B3D2F; --drf-grn-light:#E8F0EB; --drf-grn-mid:#4a7a5e; --drf-grn-dark:#0f2a1e; --drf-gold:#C5A55A; --drf-gold-light:#FAF7F0; --drf-cream:#F5F2EC; --drf-border:#d4cfc5; --drf-muted:#666; }\n  .drf-wrap h2 { font-family: 'Cormorant Garamond', serif; font-weight: 600; font-size: 1.9em; color: var(--drf-grn); line-height: 1.25; margin-bottom: 0.5em; }\n  .drf-wrap h3 { font-family: 'Cormorant Garamond', serif; font-weight: 600; font-size: 1.35em; color: var(--drf-grn); margin: 1.4em 0 0.4em; }\n  .drf-wrap h4 { font-family: 'Jost', sans-serif; font-weight: 600; font-size: 0.85em; letter-spacing: 0.1em; text-transform: uppercase; color: var(--drf-muted); margin: 1.2em 0 0.3em; }\n  .drf-wrap p { margin-bottom: 0.9em; }\n  .drf-wrap ul { padding-left: 1.2em; margin-bottom: 0.9em; }\n  .drf-wrap ul li { margin-bottom: 0.35em; }\n  .drf-wrap strong { font-weight: 600; color: var(--drf-grn); }\n  .drf-wrap em { font-style: italic; color: var(--drf-muted); }\n  .drf-badge-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: 7px; margin: 0 0 12px; }\n  .drf-badge { padding: 9px 12px; border-radius: 2px; font-size: 11px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; display: flex; align-items: center; justify-content: center; text-align: center; min-height: 36px; line-height: 1.3; }\n  .drf-badge-green { background: #eaf4ea; color: #2d6a2d; border: 1px solid #c0d8b0; }\n  .drf-badge-gold { background: #fdf6e3; color: #8b6914; border: 1px solid #e0cc80; }\n  .drf-stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--drf-border); border: 1px solid var(--drf-border); margin: 1.2em 0; max-width: 100%; }\n  .drf-stat { background: var(--drf-grn-light); padding: 0.6em 0.5em; text-align: center; }\n  .drf-stat-number { font-family: 'Cormorant Garamond', serif; font-size: 1.35em; font-weight: 700; color: var(--drf-grn); line-height: 1.1; display: block; }\n  .drf-stat-label { font-size: 0.6em; font-weight: 500; letter-spacing: 0.06em; text-transform: uppercase; color: var(--drf-muted); display: block; margin-top: 0.15em; }\n  .drf-tabs-wrap { max-width: 100%; overflow: hidden; }\n  .drf-tabs-wrap input[type=\"radio\"] { display: none; }\n  .drf-tab-labels { display: flex; align-items: stretch; border-bottom: 2px solid var(--drf-border); margin-bottom: 1.2em; }\n  .drf-tab-labels label { flex: 1 1 0; padding: 0.75em 0.4em; font-size: 0.82em; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; color: #8b6914; background: var(--drf-gold-light); cursor: pointer; text-align: center; display: flex; align-items: center; justify-content: center; border-bottom: 3px solid var(--drf-gold); margin-bottom: -2px; transition: all 0.15s; }\n  .drf-tab-labels label:hover { color: var(--drf-grn); background: var(--drf-grn-light); border-bottom-color: var(--drf-grn); }\n  .drf-panel { display: none; }\n  #drf-mk-tab1:checked ~ .drf-tab-labels label[for=\"drf-mk-tab1\"],\n  #drf-mk-tab2:checked ~ .drf-tab-labels label[for=\"drf-mk-tab2\"],\n  #drf-mk-tab3:checked ~ .drf-tab-labels label[for=\"drf-mk-tab3\"],\n  #drf-mk-tab4:checked ~ .drf-tab-labels label[for=\"drf-mk-tab4\"] { color: var(--drf-grn); background: var(--drf-grn-light); border-bottom-color: var(--drf-grn); font-weight: 700; }\n  #drf-mk-tab1:checked ~ .drf-panels #drf-mk-panel1,\n  #drf-mk-tab2:checked ~ .drf-panels #drf-mk-panel2,\n  #drf-mk-tab3:checked ~ .drf-panels #drf-mk-panel3,\n  #drf-mk-tab4:checked ~ .drf-panels #drf-mk-panel4 { display: block; }\n  .drf-callout { background: var(--drf-grn-light); border-left: 3px solid var(--drf-grn); padding: 1em 1.2em; margin: 1.2em 0; border-radius: 0 3px 3px 0; }\n  .drf-callout-gold { background: var(--drf-gold-light); border-left-color: var(--drf-gold); }\n  .drf-callout p:last-child { margin-bottom: 0; }\n  .drf-callout-title { font-size: 0.72em; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; color: var(--drf-grn); margin-bottom: 0.4em; display: block; }\n  .drf-callout-gold .drf-callout-title { color: var(--drf-gold); }\n  .drf-mech { border: 1px solid var(--drf-border); border-left: 3px solid var(--drf-gold); padding: 1em 1.2em; margin: 0.8em 0; border-radius: 0 3px 3px 0; background: var(--drf-grn-light); }\n  .drf-mech-num { font-family: 'Cormorant Garamond', serif; font-size: 2em; font-weight: 600; color: var(--drf-gold); line-height: 1; }\n  .drf-mech h4 { margin-top: 0.2em; color: var(--drf-grn); text-transform: none; letter-spacing: 0; font-size: 1em; }\n  .drf-mech p { font-size: 0.92em; color: #555; margin-bottom: 0; }\n  .drf-rate { border: 1px solid var(--drf-border); padding: 1em 1.2em; margin: 0.8em 0; border-radius: 3px; background: var(--drf-grn-light); }\n  .drf-rate h4 { margin-top: 0; color: var(--drf-grn); text-transform: none; letter-spacing: 0; font-size: 1em; font-family: 'Cormorant Garamond', serif; border-bottom: 1px solid var(--drf-border); padding-bottom: 0.5em; margin-bottom: 0.6em; }\n  .drf-rate-meta { font-size: 0.85em; color: #555; margin-bottom: 0.5em; }\n  .drf-rate-meta strong { color: var(--drf-gold); }\n  .drf-rate p { font-size: 0.92em; color: #555; margin-bottom: 0; }\n  .drf-steps { counter-reset: drf-step; list-style: none; padding: 0; }\n  .drf-steps li { counter-increment: drf-step; padding: 0.8em 0 0.8em 3em; position: relative; border-bottom: 1px solid #eee; }\n  .drf-steps li::before { content: counter(drf-step); position: absolute; left: 0; top: 0.8em; width: 2em; height: 2em; border-radius: 50%; background: var(--drf-grn); color: #fff; font-family: 'Cormorant Garamond', serif; font-weight: 600; font-size: 0.9em; display: flex; align-items: center; justify-content: center; }\n  .drf-steps li:last-child { border-bottom: none; }\n  .drf-uses { list-style: none; padding: 0; }\n  .drf-uses li { padding: 0.6em 0; border-bottom: 2px solid var(--drf-gold); }\n  .drf-uses li:nth-child(even) { border-bottom-color: var(--drf-grn); }\n  .drf-uses li:last-child { border-bottom: none; }\n  .drf-uses li strong { color: var(--drf-grn); }\n  .drf-compare { margin: 1.2em 0; }\n  .drf-compare-box { border: 1px solid var(--drf-border); padding: 1em 1.2em; margin-bottom: 0.8em; border-radius: 3px; background: var(--drf-grn-light); }\n  .drf-compare-box h4 { margin-top: 0; color: var(--drf-grn); text-transform: none; letter-spacing: 0; font-size: 1.05em; font-family: 'Cormorant Garamond', serif; border-bottom: 2px solid var(--drf-gold); padding-bottom: 0.4em; margin-bottom: 0.6em; }\n  .drf-faq { border-bottom: 1px solid var(--drf-border); }\n  .drf-faq:last-child { border-bottom: none; }\n  .drf-faq input[type=\"checkbox\"] { display: none; }\n  .drf-faq-q { display: flex; justify-content: space-between; align-items: center; padding: 0.8em 0; cursor: pointer; font-weight: 600; color: var(--drf-grn); font-size: 0.95em; }\n  .drf-faq-q::after { content: '+'; font-size: 1.3em; font-weight: 300; color: var(--drf-gold); width: 1.5em; height: 1.5em; border-radius: 50%; background: var(--drf-grn-light); display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-left: 0.6em; }\n  .drf-faq-a { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; font-size: 0.92em; color: #555; line-height: 1.7; }\n  .drf-faq-a \u003e div { padding: 0 0 1em; }\n  .drf-faq input:checked ~ .drf-faq-q::after { content: '−'; background: var(--drf-grn); color: #fff; }\n  .drf-faq input:checked ~ .drf-faq-a { max-height: 600px; }\n  .drf-refs { font-size: 0.78em; color: #888; line-height: 1.5; margin-top: 1.5em; padding-top: 0.8em; border-top: 1px solid var(--drf-border); }\n  .drf-refs ol { padding-left: 1.4em; margin: 0; }\n  .drf-refs li { margin-bottom: 0.3em; }\n  .drf-sep { border: none; border-top: 2px solid var(--drf-gold); margin: 1.5em 0; }\n\u003c\/style\u003e\n\n\u003cdiv class=\"drf-wrap\"\u003e\n\u003cdiv class=\"drf-tabs-wrap\"\u003e\n  \u003cinput type=\"radio\" name=\"drf-mk-tabset\" id=\"drf-mk-tab1\" checked\u003e\n  \u003cinput type=\"radio\" name=\"drf-mk-tabset\" id=\"drf-mk-tab2\"\u003e\n  \u003cinput type=\"radio\" name=\"drf-mk-tabset\" id=\"drf-mk-tab3\"\u003e\n  \u003cinput type=\"radio\" name=\"drf-mk-tabset\" id=\"drf-mk-tab4\"\u003e\n  \u003cdiv class=\"drf-tab-labels\"\u003e\n    \u003clabel for=\"drf-mk-tab1\"\u003eOverview\u003c\/label\u003e\n    \u003clabel for=\"drf-mk-tab2\"\u003eThe Science\u003c\/label\u003e\n    \u003clabel for=\"drf-mk-tab3\"\u003eHow to Use\u003c\/label\u003e\n    \u003clabel for=\"drf-mk-tab4\"\u003eFAQ\u003c\/label\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"drf-panels\"\u003e\n\n  \u003c!-- ═══════════ TAB 1 — OVERVIEW ═══════════ --\u003e\n  \u003cdiv class=\"drf-panel\" id=\"drf-mk-panel1\"\u003e\n    \u003ch2\u003eMicro-K — micronised potassium rock dust, 11% K₂O, solution-grade mineral fertiliser\u003c\/h2\u003e\n    \u003cdiv class=\"drf-badge-row\"\u003e\n      \u003cspan class=\"drf-badge drf-badge-green\"\u003e11% K₂O Potassium\u003c\/span\u003e\n      \u003cspan class=\"drf-badge drf-badge-green\"\u003eMicronised Powder\u003c\/span\u003e\n      \u003cspan class=\"drf-badge drf-badge-green\"\u003eSolution Grade\u003c\/span\u003e\n      \u003cspan class=\"drf-badge drf-badge-green\"\u003eFoliar \u0026amp; Soil Drench\u003c\/span\u003e\n      \u003cspan class=\"drf-badge drf-badge-green\"\u003eOrganic Approved\u003c\/span\u003e\n      \u003cspan class=\"drf-badge drf-badge-green\"\u003eQuarry-Extracted\u003c\/span\u003e\n    \u003c\/div\u003e\n    \u003cp\u003ePotassium is the nutrient that drives fruit quality, flavour development, disease resistance, and water regulation. Most potassium fertilisers are soluble salts — they deliver a sharp pulse of K that peaks fast and leaches within days. \u003cstrong\u003eMicro-K\u003c\/strong\u003e is different. It is a potassium-rich mineral rock dust, quarry-extracted and micronised to solution-grade fineness, delivering \u003cstrong\u003e11% K₂O\u003c\/strong\u003e in a form that releases gradually as the particles dissolve in soil moisture.\u003c\/p\u003e\n    \u003cp\u003eThe ultra-fine particle size means it can be suspended in water for foliar spraying and soil drenching — giving you the flexibility of a liquid feed with the sustained release characteristics of a mineral amendment. It can also be broadcast directly onto soil for long-term potassium building. Chloride-free, no synthetic processing, organic approved.\u003c\/p\u003e\n    \u003cdiv class=\"drf-stats\"\u003e\n      \u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e11%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eK₂O (Potash)\u003c\/span\u003e\n\u003c\/div\u003e\n      \u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003eMicronised\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eSolution Grade\u003c\/span\u003e\n\u003c\/div\u003e\n      \u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003eFoliar\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003e\u0026amp; Soil Drench\u003c\/span\u003e\n\u003c\/div\u003e\n      \u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003eNatural\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eMineral Origin\u003c\/span\u003e\n\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003ch3\u003eWhat Micro-K is used for in the garden\u003c\/h3\u003e\n    \u003cul class=\"drf-uses\"\u003e\n      \u003cli\u003e\n\u003cstrong\u003eFruiting and flowering crops\u003c\/strong\u003e — potassium regulates sugar transport, fruit ripening, and flower colour intensity; essential for tomatoes, strawberries, peppers, roses, and all fruiting plants\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eFlavour and quality improvement\u003c\/strong\u003e — adequate potassium increases soluble sugar content, vitamin C, and dry matter in fruit and vegetables\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eDrought and frost resistance\u003c\/strong\u003e — potassium regulates stomatal opening and cell turgor pressure, reducing water loss and improving survival under temperature extremes\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eDisease resistance\u003c\/strong\u003e — potassium strengthens cell walls, increases cuticle wax deposition, and activates plant defence enzymes\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eSoil remineralisation\u003c\/strong\u003e — broadcast application rebuilds potassium reserves in depleted soils, with a slower, more sustained release profile than soluble K salts\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eFoliar potassium for rapid response\u003c\/strong\u003e — the micronised particle size allows suspension in water for direct foliar application during peak demand or visible deficiency\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eLawn winter hardening\u003c\/strong\u003e — potassium toughens turf against frost, improves wear tolerance, and supports root development ahead of winter dormancy\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eLong-term soil building\u003c\/strong\u003e — unlike soluble potassium which leaches rapidly, mineral-bound K releases as soil biology and root exudates break down particles over the growing season\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \u003ch3\u003eWhy micronised rock potassium instead of soluble potash?\u003c\/h3\u003e\n    \u003cdiv class=\"drf-compare\"\u003e\n      \u003cdiv class=\"drf-compare-box\"\u003e\n        \u003ch4\u003eMicronised Potassium Rock Dust — Micro-K\u003c\/h4\u003e\n        \u003cul\u003e\n          \u003cli\u003eNatural mineral — quarried, ground, and packaged with no chemical processing\u003c\/li\u003e\n          \u003cli\u003eSustained release — potassium held in mineral matrix, released gradually\u003c\/li\u003e\n          \u003cli\u003eMicronised to solution-grade — suspends in water for foliar or drench use\u003c\/li\u003e\n          \u003cli\u003eAlso effective as a dry broadcast for long-term soil K building\u003c\/li\u003e\n          \u003cli\u003eContains trace minerals from the parent rock alongside potassium\u003c\/li\u003e\n          \u003cli\u003eLow salt index — no risk of root burn or salt stress\u003c\/li\u003e\n        \u003c\/ul\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"drf-compare-box\"\u003e\n        \u003ch4\u003eSulphate of Potash \/ Muriate of Potash\u003c\/h4\u003e\n        \u003cul\u003e\n          \u003cli\u003eHigher K₂O concentration (50–60%) — more potassium per gram\u003c\/li\u003e\n          \u003cli\u003eFully soluble — fast-acting but leaches rapidly in rain and watering\u003c\/li\u003e\n          \u003cli\u003eHigher salt index — greater risk of root burn in confined volumes\u003c\/li\u003e\n          \u003cli\u003eMOP adds chloride; SOP adds sulphur — additional considerations\u003c\/li\u003e\n          \u003cli\u003eIdeal for acute deficiency correction or peak-demand supplementation\u003c\/li\u003e\n          \u003cli\u003eBest used in combination with slower-release mineral sources\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\u003cp\u003eEvery Dr Forest product is made by hand in small batches at our workshop in Stockport, Greater Manchester. We source ingredients for quality, not cost. Recyclable packaging on the 1.5 kg, 3 kg, and 9 kg sizes.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- ═══════════ TAB 2 — THE SCIENCE ═══════════ --\u003e\n  \u003cdiv class=\"drf-panel\" id=\"drf-mk-panel2\"\u003e\n    \u003ch2\u003eThe science of potassium in plant nutrition\u003c\/h2\u003e\n    \u003ch3\u003eThe quality nutrient\u003c\/h3\u003e\n    \u003cp\u003ePotassium is the most abundant cation in plant tissue and the single most important nutrient for fruit quality. It does not become part of organic molecules — instead it operates as a free ion, regulating water pressure, activating over 60 enzymes, balancing electrical charges, and transporting sugars from leaves to developing fruit. Plants deficient in potassium produce smaller, less flavourful fruit with reduced shelf life and weaker resistance to disease.\u003c\/p\u003e\n    \u003chr class=\"drf-sep\"\u003e\n    \u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e01\u003c\/span\u003e\u003ch4\u003eSugar Transport \u0026amp; Fruit Quality\u003c\/h4\u003e\n\u003cp\u003ePotassium is essential for phloem loading — the active process by which sucrose is pumped into the phloem for transport to developing fruit, roots, and storage organs. Potassium-deficient plants accumulate sugars in leaves while fruit remains undersized, under-sweetened, and poorly coloured. This is why potassium is called the \"quality nutrient\" — it does not increase the quantity of growth so much as the \u003cem\u003equality\u003c\/em\u003e of what is produced.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e02\u003c\/span\u003e\u003ch4\u003eStomatal Regulation \u0026amp; Drought Tolerance\u003c\/h4\u003e\n\u003cp\u003ePotassium is the primary ion controlling stomatal aperture. Guard cells accumulate K⁺ to increase turgor and open stomata for gas exchange; they release K⁺ to close stomata and conserve water under drought stress. Plants with adequate potassium respond faster to water stress, lose less water per unit of CO₂ fixed, and recover more quickly from drought episodes. This makes potassium the most important nutrient for water use efficiency.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e03\u003c\/span\u003e\u003ch4\u003eDisease Resistance \u0026amp; Cell Wall Strength\u003c\/h4\u003e\n\u003cp\u003ePotassium strengthens cell walls by promoting lignin and cellulose synthesis, increases cuticle wax deposition, and activates pathogenesis-related (PR) proteins. Potassium-sufficient plants show reduced incidence of fungal diseases including powdery mildew, botrytis, and fusarium wilt. The mechanism is physical — stronger cell walls resist penetration by fungal hyphae — combined with faster enzymatic defence cascades.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e04\u003c\/span\u003e\u003ch4\u003eFrost Hardiness\u003c\/h4\u003e\n\u003cp\u003ePotassium lowers the freezing point of cell sap by increasing solute concentration, maintaining membrane integrity under temperature extremes. Autumn applications of potassium are standard practice in professional turf management and orchard care specifically to harden tissue against winter frost damage.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e05\u003c\/span\u003e\u003ch4\u003eMicronised Rock Dust — Sustained Release\u003c\/h4\u003e\n\u003cp\u003eIn soluble form (SOP, MOP), potassium is immediately available but highly mobile in soil solution — it leaches rapidly in rain and irrigation, particularly in sandy and container soils. Potassium held within a mineral rock matrix releases as the particle surface dissolves in soil moisture and is attacked by root exudates and microbial organic acids. The micronisation of Micro-K dramatically increases the surface area available for this dissolution, accelerating release compared to coarse rock dust while maintaining the sustained-availability advantage over fully soluble salts.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e06\u003c\/span\u003e\u003ch4\u003eDeficiency Symptoms\u003c\/h4\u003e\n\u003cp\u003ePotassium is phloem-mobile, so deficiency symptoms appear on older leaves first. The classic sign is marginal leaf scorch — brown, dry edges on lower leaves that progress inward. Other symptoms include poor fruit set, small fruit, weak stems, and increased susceptibility to disease and frost damage. In lawns, potassium deficiency manifests as poor winter survival and slow spring recovery.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-refs\"\u003e\n\u003ch4\u003eScientific References\u003c\/h4\u003e\n\u003col\u003e\n      \u003cli\u003eMengel, K. \u0026amp; Kirkby, E.A. (2001). \u003cem\u003ePrinciples of Plant Nutrition\u003c\/em\u003e. 5th ed. Kluwer Academic.\u003c\/li\u003e\n      \u003cli\u003eMarschner, P. (2012). \u003cem\u003eMarschner's Mineral Nutrition of Higher Plants\u003c\/em\u003e. 3rd ed. Academic Press.\u003c\/li\u003e\n      \u003cli\u003eWang, M. et al. (2013). The critical role of potassium in plant stress response. \u003cem\u003eInt. J. Mol. Sci.\u003c\/em\u003e, 14, 7370–7390.\u003c\/li\u003e\n      \u003cli\u003ePettigrew, W.T. (2008). Potassium influences on yield and quality production for maize, wheat, soybean and cotton. \u003cem\u003ePhysiologia Plantarum\u003c\/em\u003e, 133(4), 670–681.\u003c\/li\u003e\n    \u003c\/ol\u003e\n\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- ═══════════ TAB 3 — HOW TO USE ═══════════ --\u003e\n  \u003cdiv class=\"drf-panel\" id=\"drf-mk-panel3\"\u003e\n    \u003ch2\u003eHow to use Micro-K: application rates \u0026amp; guide\u003c\/h2\u003e\n    \u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eSolution-grade micronised powder\u003c\/span\u003e\u003cp\u003eMicro-K suspends in water for foliar spraying and soil drenching. Stir or shake well before and during application — as a mineral suspension it will settle over time. It can also be broadcast directly onto soil as a dry amendment for long-term potassium building.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003ch3\u003eApplication rates\u003c\/h3\u003e\n    \u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eSoil drench — liquid application\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 0.5–1g per litre of water  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Every 2–4 weeks during the growing season\u003c\/div\u003e\n\u003cp\u003eSuspend in water and apply to the root zone. Particularly useful during peak fruiting and flowering when potassium demand spikes. Use at the higher rate for heavy-feeding crops like tomatoes and peppers.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eFoliar spray — rapid potassium delivery\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 0.5–1g per litre of water  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Every 7–14 days during fruiting\u003c\/div\u003e\n\u003cp\u003eSpray both leaf surfaces in early morning or late evening. Stir the solution regularly during spraying to maintain suspension. Foliar potassium is absorbed rapidly and can supplement root uptake during peak demand.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eSoil broadcast — dry application for beds and borders\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 150–350g per m²  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Once or twice per year\u003c\/div\u003e\n\u003cp\u003eScatter evenly and work into the top layer if possible. Water in. The micronised particles release potassium gradually as they dissolve in soil moisture. Use the higher rate for known-deficient soils or heavy-feeding crops.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eTrees and shrubs\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 5–15 kg per plant  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Annually in spring or autumn\u003c\/div\u003e\n\u003cp\u003eSpread around the drip line and work into the soil. Water in thoroughly. Particularly important for fruit trees, vines, and ornamental trees where potassium supports fruit quality and winter hardiness.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eLawns and turf\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 50–150g per m²  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Twice per year — spring and autumn\u003c\/div\u003e\n\u003cp\u003eBroadcast evenly and water in. The autumn application is particularly important for winter hardening. Potassium improves frost tolerance, wear resistance, and spring recovery.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003ch3\u003eStep-by-step preparation for liquid application\u003c\/h3\u003e\n    \u003col class=\"drf-steps\"\u003e\n      \u003cli\u003e\n\u003cstrong\u003eMeasure the powder.\u003c\/strong\u003e For a 10-litre watering can, measure 5–10g (1–2 level teaspoons).\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eAdd to water and stir vigorously.\u003c\/strong\u003e The micronised powder suspends in water but will settle over time. Stir or shake regularly during application.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eApply to foliage or root zone.\u003c\/strong\u003e For foliar sprays, use a sprayer with good agitation. For root drenches, apply evenly around the base of the plant.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eTime to demand.\u003c\/strong\u003e Potassium demand peaks during flowering and fruit development. Begin supplementing when the first flowers appear and continue through to harvest.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eStore dry powder sealed.\u003c\/strong\u003e Keep in a cool, dry place. Shelf life is indefinite when kept dry.\u003c\/li\u003e\n    \u003c\/ol\u003e\n    \u003cdiv class=\"drf-callout\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eWorks well combined with…\u003c\/span\u003e\u003cp\u003eFor higher-concentration soluble potassium during peak fruiting, combine with \u003cstrong\u003eSulphate of Potash\u003c\/strong\u003e (50% K₂O). Use alongside \u003cstrong\u003eYorkshire Polyhalite\u003c\/strong\u003e for balanced K, Ca, Mg, and S. Pair with \u003cstrong\u003eMicro-Mag\u003c\/strong\u003e to maintain K:Mg balance — high potassium can induce magnesium deficiency if Mg is not also supplemented. Add \u003cstrong\u003eSeaweed Powder\u003c\/strong\u003e for biostimulant activity.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- ═══════════ TAB 4 — FAQ ═══════════ --\u003e\n  \u003cdiv class=\"drf-panel\" id=\"drf-mk-panel4\"\u003e\n    \u003ch2\u003eFrequently asked questions about Micro-K\u003c\/h2\u003e\n    \u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-mk-faq1\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-mk-faq1\"\u003eWhy only 11% K₂O when sulphate of potash is 50%?\u003c\/label\u003e\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eMicro-K is a natural rock dust, not a refined salt. The potassium is bound within the mineral matrix and releases gradually as particles dissolve in soil moisture. Sulphate of potash is a concentrated soluble salt — higher K per gram but it leaches faster and has a higher salt index. The two products serve different purposes: Micro-K for sustained background potassium and soil building, SOP for acute supplementation during peak demand. Many growers use both.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-mk-faq2\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-mk-faq2\"\u003eWhat are the symptoms of potassium deficiency?\u003c\/label\u003e\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eMarginal leaf scorch on older leaves — brown, dry edges that progress inward. Because potassium is mobile in the plant, deficiency always appears on older leaves first as K is remobilised to new growth. Other signs include poor fruit set, small or poorly flavoured fruit, weak stems, and increased susceptibility to disease and frost damage.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-mk-faq3\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-mk-faq3\"\u003eCan I use Micro-K as a foliar spray?\u003c\/label\u003e\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eYes. The micronised particle size suspends in water for sprayer application. Stir or shake regularly during use as particles will settle. Foliar potassium is absorbed through the leaf surface and can supplement root uptake during periods of high demand. Spray in early morning or late evening for best absorption.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-mk-faq4\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-mk-faq4\"\u003eIs Micro-K chloride-free?\u003c\/label\u003e\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eYes. Micro-K is a natural mineral rock dust containing no chloride. It is safe for chloride-sensitive crops including tomatoes, strawberries, potatoes, grapes, and salad crops.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-mk-faq5\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-mk-faq5\"\u003eIs Micro-K suitable for organic growing?\u003c\/label\u003e\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eYes. Natural quarry-extracted potassium-rich rock dust with no synthetic processing or chemical additives. Suitable for use in organic growing systems.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-mk-faq6\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-mk-faq6\"\u003eCan I use Micro-K on lawns?\u003c\/label\u003e\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eYes. Potassium is essential for turf winter hardiness, drought tolerance, and wear resistance. Apply 50–150g per m² in spring and autumn. The autumn application is particularly important for hardening turf against frost and winter damage.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-mk-faq7\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-mk-faq7\"\u003eDoes it dissolve completely in water?\u003c\/label\u003e\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eNo — like all rock dust products, Micro-K forms a suspension rather than a true solution. The micronised particle size allows it to suspend effectively for spraying and drenching, but it will settle over time. Stir or agitate regularly during application. This is normal and does not reduce effectiveness.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-mk-faq8\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-mk-faq8\"\u003eWill high potassium cause magnesium deficiency?\u003c\/label\u003e\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003ePotassium and magnesium compete for root uptake sites. Very high potassium levels can suppress magnesium absorption, particularly in containers where the root zone is confined. If you are applying potassium heavily during fruiting, consider supplementing with \u003cstrong\u003eMicro-Mag\u003c\/strong\u003e or \u003cstrong\u003eYorkshire Polyhalite\u003c\/strong\u003e (which contains both K and Mg) to maintain the balance.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-mk-faq9\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-mk-faq9\"\u003eIs the packaging recyclable?\u003c\/label\u003e\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eThe 1.5 kg, 3 kg, and 9 kg sizes are supplied in recyclable packaging. The 500g size is not currently in recyclable packaging.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Dr Forest","offers":[{"title":"500g","offer_id":45753767395515,"sku":null,"price":6.99,"currency_code":"GBP","in_stock":true},{"title":"1.5kg","offer_id":45753767428283,"sku":null,"price":13.99,"currency_code":"GBP","in_stock":true},{"title":"3kg","offer_id":45765532221627,"sku":null,"price":24.0,"currency_code":"GBP","in_stock":true},{"title":"9kg","offer_id":56320556826998,"sku":null,"price":56.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0049\/8194\/8504\/files\/micro-k-micronised-potassium-fertiliser-11-organic-solution-427.webp?v=1772229376","url":"https:\/\/www.drforest.co.uk\/products\/organic-potassium-fertiliser","provider":"Dr Forest","version":"1.0","type":"link"}