Nutrient Composition and High Phosphorus Density
Mono Ammonium Phosphate (12-61-0) possesses the highest concentration of plant-available phosphorus among fully water-soluble fertilizers.
Under the Fertilizer Control Order (FCO), it dissolves completely without leaving insoluble grits, preventing micro-irrigation emitter blockages.
Its moderately acidic reaction in solution helps keep micro-nutrients soluble in alkaline soils and prevents calcium phosphate precipitation.
- Total Nitrogen (12%): Present in ammoniacal form for steady root-level uptake
- Water-soluble Phosphate (61%): Readily available orthophosphate for immediate cellular energy transfer
- Acidic pH: Moderately acidic solution enhances micronutrient availability in root zones
Crop Stages and Application Methods
12-61-0 is utilized during early crop phases when root establishment and cellular energy (ATP) requirements are highest.
It is also applied prior to flowering to promote uniform flower bud initiation and reduce early blossom abscission.
- Early vegetative stage: Promotes rapid seedling root proliferation and robust crown development
- Pre-flowering phase: Stimulates profuse floral primordial development across horticultural crops
- Drip fertigation: Injected via venturi or fertilizer tanks at recommended concentrations per irrigation cycle
- Foliar feeding: Applied at low foliar concentrations during periods of high phosphorus demand
Storage, Compatibility, and Quality Checks
Because 12-61-0 is acidic in solution, it should not be mixed in concentrated stock tanks with calcium-containing fertilizers (such as Calcium Nitrate) to prevent insoluble precipitates.
Store bags in dry, covered godowns and ensure FCO batch certification marks are checked upon dealer purchase.
- Tank compatibility: Compatible with most soluble potassium and magnesium fertilizers; separate from calcium salts
- Moisture protection: Reseal opened bags tightly to prevent hygroscopic moisture absorption
- Soil test alignment: Coordinate phosphorus applications with Soil Health Card recommendations
Official source
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Department of Fertilizers - IFMS Portal ↗Related on KisanPe
Common questions
What is the common chemical name of 12-61-0 fertilizer?
12-61-0 is commonly known as Mono Ammonium Phosphate (MAP).
Why is 12-61-0 recommended during early crop growth?
Its 61% water-soluble phosphorus stimulates rapid root proliferation, seedling vigor, and strong plant anchorage.
Can 12-61-0 be mixed with Calcium Nitrate in the same fertigation tank?
No, mixing concentrated phosphate with calcium causes insoluble calcium phosphate precipitation, clogging drip emitters.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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