Chemical composition and root zone acidification benefits
Mono Ammonium Phosphate provides an unmatched ratio of plant-available phosphate paired with starter ammoniacal nitrogen.
- Nutrient grade: 12-61-0 containing 12 percent ammoniacal nitrogen and 61 percent water-soluble phosphate (P2O5).
- High water solubility: Dissolves rapidly without clogging micro-irrigation drip emitters or foliar spray nozzles.
- Rhizosphere acidification: Moderately acidifies the immediate root zone, enhancing the availability of soil phosphorus, zinc, and iron in alkaline soils.
- Low salt index: Minimizes root burning and salinity risks during delicate seedling establishment.
Crop agronomic advantages across development phases
MAP delivers concentrated phosphorus at critical biological stages when energy transfer (ATP synthesis) is paramount.
- Early vegetative stage: Promotes vigorous primary and secondary root development and rapid seedling anchorage.
- Pre-flowering and bloom initiation: Accelerates floral bud differentiation and boosts flowering percentage.
- Legumes and pulses: Provides essential phosphorus without supplying excess nitrogen that inhibits nodulation.
- Cereals and oilseeds: Encourages early tillering, sturdy root crowns, and uniform seed head emergence.
Application techniques: Fertigation and foliar feeding
Apply MAP through drip irrigation systems or as a foliar mist during early vegetative growth and pre-flowering. Do not mix concentrated MAP stock solutions with calcium fertilizers in the same tank, as insoluble calcium phosphate precipitates will form. Quality and purity are governed under the Fertilizer (Control) Order (FCO).
Official source
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Department of Fertilizers (Govt of India) ↗Related on KisanPe
Common questions
What is the NPK nutrient grade of Mono Ammonium Phosphate (MAP)?
MAP has an NPK analysis of 12-61-0, containing 12 percent ammoniacal nitrogen and 61 percent water-soluble phosphate.
Why is MAP beneficial for alkaline and calcareous soils?
MAP has a mild acidifying reaction in the root zone, which helps keep phosphorus and micronutrients like zinc and iron available in high-pH soils.
Can MAP be mixed with Calcium Nitrate in the same fertigation tank?
No, mixing concentrated phosphate with calcium causes insoluble calcium phosphate to precipitate, clogging drip irrigation emitters.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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