Chemical Properties and Acidifying Benefits
Urea Phosphate is an equimolar compound of urea and phosphoric acid. When dissolved in irrigation water, it lowers solution pH drastically, dissolving carbonate scale and making fixed phosphorus, iron, and zinc bioavailable to crop roots.
In alkaline, calcareous soils where phosphorus commonly binds with calcium into insoluble calcium phosphate, Urea Phosphate maintains phosphorus in an absorbable soluble ionic state.
- 17% Urea Nitrogen: Supplies fast-acting nitrogen that supports early vegetative vigor and root proliferation.
- 44% Phosphate (P2O5): High-concentration water-soluble phosphate that stimulates rapid root branching, tillering, and flower bud formation.
- Cleans drip irrigation lines: Acidic reaction dissolves calcium and magnesium carbonate scale inside drip lateral emitters, preventing clogging.
- Calcareous soil correction: Mobilizes native micronutrients (iron, zinc, manganese) in high-pH alkaline soils.
Fertigation Application and Tank Compatibility
Urea Phosphate is designed for precision drip fertigation during early vegetative growth and root establishment phases.
Growers must observe strict tank-mixing precautions when combining with other agricultural fertilizers.
- Application timing: Apply during initial rooting and vegetative establishment when crop demand for phosphorus peaks.
- Do not mix with calcium: Never mix directly with calcium nitrate in the same mother tank to avoid forming insoluble calcium phosphate precipitates.
- Drip system maintenance: Inject periodically into drip systems to maintain clean emitter orifices without requiring separate hazardous acid flushes.
Official source
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Common questions
What nutrients are present in Urea Phosphate (17-44-0)?
It contains 17% Nitrogen and 44% water-soluble Phosphate (P2O5) in a strongly acidic formulation.
Why is Urea Phosphate particularly beneficial in alkaline soils?
Its acidic reaction lowers soil solution pH around the root zone, preventing phosphorus from locking with calcium into insoluble precipitates.
How does Urea Phosphate help clean drip irrigation lines?
When injected through drip systems, its low pH dissolves mineral carbonate scale that clogs drip emitters, keeping irrigation lines clear.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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