NP [CAS?] supplies nitrogen and phosphorus in equal declared proportions, with no potassium. At 40 % total nutrient it is a higher-analysis product than [CAS?], and its balanced ratio positions it differently: rather than front-loading phosphorus with a starter charge of nitrogen, it delivers a substantial share of both at once. It is a mainstream basal grade in cereal-dominated systems across South Asia and the Middle East, and is the natural point of comparison for any other zero-potassium compound.
Substance identity
| Field | Value |
|---|---|
| Product type | Formulation — no single CAS number |
| Grade | [CAS?] (N — P₂O₅ — K₂O) |
| Nutrients per tonne | 200 kg N · 200 kg P₂O₅ · 0 kg K₂O |
| Total declared nutrient | 40 % |
| Typical constituents | ammonium phosphates with ammonium sulfate and/or urea |
No single CAS number applies. This is a manufactured formulation, not a chemical substance. Its constituents each hold their own registry numbers and are declared individually on the safety data sheet.
Specification
Typical commercial declaration — confirm on certificate of analysis:
| Parameter | Typical |
|---|---|
| Total nitrogen (N) | 20 % |
| P₂O₅, total | 20 % |
| Water-soluble P₂O₅ as % of total | declare on CoA |
| K₂O | 0 % |
| Sulfur (S) | route-dependent; not guaranteed unless declared |
| Moisture | ≤ 1.5 – 2.5 % |
| Particle size | ≥ 90 % within 2 – 4 mm |
| Appearance | granular |
Properties
-
N : P₂O₅ ratio of 1 : 1, and 40 % total declared nutrient against 36 % for [CAS?] — an 11 % relative gain in nutrient per tonne handled, which affects freight, storage volume and spreading passes.
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Practical consequence of the ratio. Replacing [CAS?] with [CAS?] at the same rate delivers the same phosphorus but 25 % more nitrogen. Substitution between the two grades therefore requires the topdress nitrogen program to be recalculated, not just the basal rate — a step that is skipped often enough to be worth stating plainly.
- Nitrogen form is not visible in the grade. Ammoniacal and ureic nitrogen behave differently in the field with respect to leaching and volatilization loss. Request the form and, where relevant, the split.
- Compound or blend — confirm which. Compound granules cannot segregate nutrient-wise; physical blends can.
Applications
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Basal fertilizer for cereals — wheat, maize, rice, barley, sorghum — applied at or before sowing, drilled or broadcast and incorporated.
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Where a 1 : 1 ratio is the right call. Balanced grades suit soils of medium phosphorus status where a meaningful basal nitrogen charge is also wanted: cool early-season soils where mineralization of soil organic nitrogen is slow, crops with high early nitrogen demand, and situations where the number of field passes must be minimized and a larger share of the season’s nitrogen is therefore applied up front.
- Where [CAS?] is the better call instead. On soils of low phosphorus status where the priority is maximum P per unit spent, or in systems where nitrogen is deliberately kept low at establishment and delivered entirely in split topdressings — for instance to limit early lodging risk in cereals or excessive vegetative growth in some vegetable crops.
- Vegetables and industrial crops as a pre-plant base, closed out with topdress N and separate K where required.
- The 0 % K decision rests on soil test potassium, crop K removal and whether K is being supplied separately. Continuous use of zero-K grades depletes soil potassium reserves over successive seasons; this is a program-design question, not a product question.
Handling and storage
Dry, covered, ventilated storage; bagged on pallets; humidity control, since multi-salt compounds have a lower critical relative humidity than their individual components. Limit stack height against set. Segregate from lime and other alkaline materials. Keep away from heat and moisture. Where the product contains urea, moisture control is more critical still — urea-containing compounds pick up atmospheric moisture readily and cake.
Notes
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No CAS number for the formulation; constituents individually on the SDS.
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Sulfur: where a sulfate route is used, incidental S is present but is not a guaranteed specification unless declared. For a guaranteed sulfur supply, specify NPS [CAS?]-13S.
- Conversion: 20 % P₂O₅ = 8.7 % elemental P.
- Compare on cost per unit of N and per unit of P₂O₅ together, never per tonne, when choosing between [CAS?] and [CAS?].