Chemical Composition and High Phosphate Purity
Mono Ammonium Phosphate (NH4H2PO4) represents one of the most concentrated water-soluble phosphorus sources available in modern horticulture. Its high nutrient analysis delivers 12% Nitrogen in ammoniacal form and 61% Phosphorus as available P2O5.
Its high chemical purity and low salt index ensure rapid plant absorption without risk of foliar scorching or root tip burning. Its acidic reaction in soil solutions (pH 4.0 to 4.5) improves the bioavailability of native micronutrients like iron, zinc, and manganese.
- High Phosphate Concentration: 61% P2O5 powers rapid root elongation and adenosine triphosphate (ATP) cellular energy synthesis.
- Ammoniacal Nitrogen: 12% NH4-N supports protein synthesis and vegetative tissue growth without excessive rank canopy flushes.
- Acidic Solution Dynamics: Lower pH improves phosphorus uptake efficiency in neutral, calcareous, and alkaline soils.
Critical Agronomic Growth Stages and Crop Benefits
12-61-00 is primarily scheduled during early crop development phases when phosphorus demands are peak. In transplanting vegetables and seeded field crops, early application accelerates primary taproot and lateral fibrous root proliferation.
During reproductive transitions, applying MAP stimulates uniform flower bud differentiation, increases pollen viability, promotes fruit setting, and reduces premature flower and fruit drop in vegetables and orchards.
- Root Development Stage: Establishes a dense root network for nutrient foraging and drought resistance.
- Flower Initiation: Stimulates floral primordia formation and bloom uniformity in tomatoes, capsicum, and melons.
- Horticultural Versatility: Ideal for drip fertigation in polyhouses, open-field drip systems, and foliar spray recovery after cold stress.
Application Methods and Fertigation Guidelines
12-61-00 can be applied through pressurized micro-irrigation (drip fertigation) or as a foliar spray. Because it dissolves completely in water without leaving insoluble residues, it prevents clogging of drip emitters and spray nozzles.
Do not mix MAP with fertilizers containing soluble calcium (such as Calcium Nitrate) or magnesium sulphate in concentrated stock solution tanks, as chemical precipitation will form insoluble calcium phosphate.
- Fertigation Practice: Dissolve directly into fertilizer injection tanks; compatible with potassium nitrate and urea.
- Foliar Spray Technique: Apply in early morning or late afternoon when relative humidity supports foliar stomatal absorption.
- Storage Caution: Keep bags sealed in dry, moisture-free storage sheds to prevent hygroscopic caking.
Official source
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Department of Fertilisers, Ministry of Chemicals and Fertilizers ↗Related on KisanPe
Common questions
What is 12-61-00 fertilizer technically known as?
12-61-00 is chemically known as Mono Ammonium Phosphate (MAP), a 100% water-soluble mineral fertilizer.
Can 12-61-00 be mixed with Calcium Nitrate in the same fertigation tank?
No, mixing Mono Ammonium Phosphate with Calcium Nitrate in the same concentrated stock tank causes insoluble calcium phosphate precipitation, clogging drip lines.
Why is 12-61-00 especially useful during the early root development stage?
Its 61% soluble phosphate provides the essential cellular energy (ATP) required for rapid cell division, root elongation, and lateral feeder root expansion.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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