Chemical Matrix and High-Phosphate Concentration
NPK 11:50:11 is an ultra-high phosphate water-soluble compound fertilizer containing 11% Total Nitrogen (N), 50% Water-Soluble Phosphate (P2O5), and 11% Water-Soluble Potash (K2O).
Manufactured from high-purity monoammonium phosphate (MAP), technical monopotassium phosphate (MKP), and potassium nitrate, it dissolves completely in water, leaving zero insoluble residue in micro-irrigation lines.
- Nitrogen (N): 11 percent (balanced ammoniacal and nitrate forms for early vegetative vigor)
- Phosphate (P2O5): 50 percent (ultra-high water-soluble phosphorus driving cellular energy and root growth)
- Potash (K2O): 11 percent (soluble potassium enhancing cellular turgor and enzymatic balance)
- Regulatory status: Fully recognized under the Fertilizer (Control) Order (FCO) 100% water-soluble schedule
Physiological Functions in Early Growth and Budding
Phosphorus is the primary constituent of nucleic acids (DNA/RNA) and cellular energy currencies (ATP/ADP). The 50% phosphate concentration provides an energy surge for expanding root systems.
Applying 11:50:11 during early seedling emergence or pre-bloom triggers root elongation, enhances root hair surface area, and stimulates floral bud differentiation to minimize unpollinated flower drop.
- Root initiation: Stimulates rapid taproot elongation and dense lateral feeder root proliferation
- Transplant establishment: Minimizes transplant shock in vegetable seedlings and fruit saplings
- Floral differentiation: Enhances reproductive bud formation, pollen fertility, and early fruit set
- Target crops: Tomato, chilli, capsicum, potato, cotton, grapes, pomegranate, and floriculture
Drip Fertigation and Foliar Application Guidelines
NPK 11:50:11 dissolves rapidly in water, forming a slightly acidic solution that enhances foliar cuticular uptake and prevents calcium-carbonate scaling in drip emitters.
For foliar spraying, dissolve 4 to 5 grams per liter of clean water during early morning hours. For micro-irrigation systems, fertigate at 3 to 5 kg per acre per application during early vegetative and pre-flowering stages.
- Foliar concentration: 4 to 5 g per liter of clean water sprayed during cool morning or evening hours
- Drip fertigation: 3 to 5 kg per acre per application during initial vegetative and bud formation phases
- Emitter safety: 100 percent solubility prevents clogging in drippers, micro-jets, and sprinkler nozzles
- Tank compatibility: Compatible with neutral micronutrients; avoid mixing directly with concentrated calcium nitrate
Official source
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Department of Fertilizers, Ministry of Chemicals and Fertilizers ↗Related on KisanPe
Common questions
What is the primary benefit of applying NPK 11:50:11 fertilizer?
With its 50 percent water-soluble phosphate content, it provides an energy surge that accelerates root system development and stimulates floral bud differentiation.
Can NPK 11:50:11 be applied to standing nursery seedlings?
Yes, light foliar drenching or micro-sprinkler applications at low concentrations (2 to 3 g/L) help nursery seedlings establish strong root systems before field transplanting.
Why should high-phosphate fertilizers not be mixed with Calcium Nitrate?
Soluble phosphate reacts with calcium ions to form insoluble calcium phosphate precipitate, which can clog micro-irrigation filters and drip emitters.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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