Agriculture Fertilizer Requirement Phosphorus
Account harvest P removal plus caller soil-build budget and credits, explicitly separating elemental P, P2O5 and product mass; distinct from N recovery/uptake balance, without soil-test recommendations.
Description
A phosphorus budget distinguishes elemental P from P₂O₅ equivalents and fertilizer product mass.
A phosphorus budget distinguishes elemental P from P₂O₅ equivalents and fertilizer product mass. Harvest removal, soil-building allowance and other credits are supplied accounting terms.1
Account harvest P removal plus caller soil-build budget and credits, explicitly separating elemental P, P2O5 and product mass; distinct from N recovery/uptake balance, without soil-test recommendations.
When to use Agriculture Fertilizer Requirement Phosphorus
Use this tool to account harvest P removal plus caller soil-build budget and credits, explicitly separating elemental P, P2O5 and product mass; distinct from N recovery/uptake balance, without soil-test recommendations.
Prepare the field, crop, soil or material measurements for the intended period. Confirm units, dry/wet bases and supplied parameters; keep paired observations aligned.
How to use Agriculture Fertilizer Requirement Phosphorus and understand its results
- Prepare the field, crop, soil or material measurements for the intended period. Confirm units, dry/wet bases and supplied parameters; keep paired observations aligned.
- Enter plannedHarvestYieldTonnesPerHa, harvestPhosphorusKgPerTonne, soilBuildPhosphorusKgPerHa, otherAvailablePhosphorusKgPerHa, declaredP2O5ToElementalPMassFactor, productP2O5MassFraction using the field table and calculation rules, then run the tool.
- Read netElementalPhosphorusBudgetKgPerHa, equivalentP2O5KgPerHa, modelPhosphorusProductKgPerHa. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| plannedHarvestYieldTonnesPerHa | Planned harvest yield tonnes per ha | number | Required |
| harvestPhosphorusKgPerTonne | Harvest phosphorus kg per tonne | number | Required |
| soilBuildPhosphorusKgPerHa | Soil build phosphorus kg per ha | number | Required |
| otherAvailablePhosphorusKgPerHa | Other available phosphorus kg per ha | number | Required |
| declaredP2O5ToElementalPMassFactor | Declared p2 o5 to elemental p mass factor | number | Required |
| productP2O5MassFraction | Product p2 o5 mass fraction | number | Required |
Enter nonnegative yield and elemental-P budget quantities. Supply P₂O₅-to-elemental-P mass factor and product P₂O₅ fraction greater than zero and at most one. Return net elemental kg/ha, equivalent P₂O₅ kg/ha and product kg/ha after dividing by product fraction.
netP = max(0,yieldTonnes×P removalPerTonne+soilBuild−credits); P2O5 = netP/conversionFactor Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| netElementalPhosphorusBudgetKgPerHa | Net elemental phosphorus budget kg per ha | number |
| equivalentP2O5KgPerHa | Equivalent p2 o5 kg per ha | number |
| modelPhosphorusProductKgPerHa | Model phosphorus product kg per ha | number |
{
"input": {
"plannedHarvestYieldTonnesPerHa": 5,
"harvestPhosphorusKgPerTonne": 2,
"soilBuildPhosphorusKgPerHa": 5,
"otherAvailablePhosphorusKgPerHa": 3,
"declaredP2O5ToElementalPMassFactor": 0.44,
"productP2O5MassFraction": 0.2
},
"output": {
"netElementalPhosphorusBudgetKgPerHa": 12,
"equivalentP2O5KgPerHa": 27.272727272727273,
"modelPhosphorusProductKgPerHa": 136.36363636363635
}
}Limitations and assumptions
The conversion factor means elemental P per mass of P₂O₅, so division converts P demand to oxide equivalent. No soil-test interpretation, agronomic sufficiency or field application recommendation is supplied.
Numeric inputs must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Agriculture Fertilizer Requirement Nitrogen: Balance caller crop N uptake/available soil/other credits with explicit recovery/product fractions; a simple accounting scenario, not agronomic sufficiency, environmental permission or application recommendation. For a complementary task, use Agriculture Manure Nutrient Content: Account declared independent dry-basis manure nutrient components from wet mass and model first-year availability; elemental/oxide bases must be consistent and release fractions are not nutrient sufficiency recommendations.
References
Similar or alternative tools
- Agriculture Fertilizer Requirement Nitrogen
Balance caller crop N uptake/available soil/other credits with explicit recovery/product fractions; a simple accounting scenario, not agronomic sufficiency, environmental permission or application recommendation.
- Agriculture Manure Nutrient Content
Account declared independent dry-basis manure nutrient components from wet mass and model first-year availability; elemental/oxide bases must be consistent and release fractions are not nutrient sufficiency recommendations.