Granulated Rock Phosphate (Dolophos26) is a premium, minimally processed mineral fertilizer containing 11% Phosphorus (P) designed for long-term soil fertility. Fully approved for organic farming systems, this slow-release formula provides a steady supply of plant-available phosphate throughout the growing season while enriching the soil with secondary nutrients, including 30% Calcium and 2% Magnesium. It is an ideal, non-acidifying alternative to conventional superphosphates for horticulture, tillage, and grasslands.
Granulated Rock Phosphate (Dolophos26) is a premium, minimally processed mineral fertilizer containing 11% Phosphorus (P) designed for long-term soil fertility. Fully approved for organic farming systems, this slow-release formula provides a steady supply of plant-available phosphate throughout the growing season while enriching the soil with secondary nutrients, including 30% Calcium and 2% Magnesium. It is an ideal, non-acidifying alternative to conventional superphosphates for horticulture, tillage, and grasslands.
Granulated Rock Phosphate 11% P (Dolophos26) by Fruit Hill Farm is a natural mineral product derived from mined rock phosphate that is finely ground and granulated to allow for gradual biological degradation in the soil. Free from chemical acidulation processing, it is fully approved for organic holdings (subject to certification body confirmation). Because it releases nutrients steadily and matches crop uptake over time, it provides an environmentally responsible strategy to build baseline phosphate fertility without the risk of immediate nutrient leaching.
Vital Root & Establishment Support: Phosphorus is critical for robust root architecture and early crop establishment. Dolophos effectively treats and prevents deficiency symptoms such as stunted growth, stiff blue/green foliage, and small, overly acidic fruit.
Three-Year Nutrient Release Curve: Ground rock phosphate acts as a long-term reservoir, typically distributing its phosphorus load evenly over a three-year cycle (roughly one-third per year).
Synergy with Legumes & Nitrogen Fixation: Adequate phosphorus is the core limiting nutrient required to optimize nitrogen ($N$) fixation by Rhizobium bacteria in legume root nodules. Legumes naturally acidify the root zone, which enhances their ability to unlock and absorb phosphorus from Dolophos.
Soil Conditioning (Liming Effect): Unlike conventional superphosphates that acidify the root zone, Dolophos contains approximately 35% Calcium, providing a mild, beneficial liming effect to improve overall soil structure.
Primary Nutrient: 11% Elemental Phosphorus (P)
Secondary Nutrients: 30% Calcium (Ca), 2% Magnesium (MgCO_3)
Trace Minerals: Rich in vital micronutrients including Manganese (Mn), Zinc (Zn), Copper (Cu), and Molybdenum (Mo).
Solubility: High solubility in a 2% formic acid solution.
pH Interaction: Performs most efficiently in soils with a pH below 6.5.
While beneficial for broad tillage and grassland operations, highly susceptible crops that benefit from this targeted placement include carrots, lettuce, spinach, apples, currants, and gooseberries.
Standard Application Rates:
Maintenance Application: Approximately 2–3 kg per 100 m².
Tillage / Arable Land: 200–400 kg per hectare.
Grassland Yield Management: 200–300 kg per hectare.
Note: Higher corrective application rates should be guided precisely by an analytical soil test.
Available Sizes: Convenient 4 kg Garden Packs and 20 kg bags for commercial growers. Bulk 600 kg bags are also supplied upon direct request.
Compliance Note: For bulk agricultural volumes, a valid Fertilizer End User (FEU) registration number must be provided at the time of purchase
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