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.
Description
A nitrogen product budget separates uncovered crop uptake from fertilizer recovery and nutrient concentration.
A nitrogen product budget separates uncovered crop uptake from fertilizer recovery and nutrient concentration. Soil and other credits reduce demand before those two corrections are applied.1
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.
When to use Agriculture Fertilizer Requirement Nitrogen
Use this tool to 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.
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 Nitrogen 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 cropNitrogenUptakeTargetKgPerHa, soilAvailableNitrogenKgPerHa, otherNitrogenCreditKgPerHa, fertilizerRecoveryFraction, fertilizerNitrogenMassFraction using the field table and calculation rules, then run the tool.
- Read uncoveredCropNitrogenDemandKgPerHa, modelFertilizerNitrogenKgPerHa, modelFertilizerProductKgPerHa. 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 |
|---|---|---|---|
| cropNitrogenUptakeTargetKgPerHa | Crop nitrogen uptake target kg per ha | number | Required |
| soilAvailableNitrogenKgPerHa | Soil available nitrogen kg per ha | number | Required |
| otherNitrogenCreditKgPerHa | Other nitrogen credit kg per ha | number | Required |
| fertilizerRecoveryFraction | Fertilizer recovery fraction | number | Required |
| fertilizerNitrogenMassFraction | Fertilizer nitrogen mass fraction | number | Required |
Enter nonnegative nitrogen targets and credits in kg/ha, with recovery and product nitrogen fractions greater than zero and at most one. Return uncovered crop demand, modeled fertilizer nitrogen and modeled fertilizer product kg/ha. Credits above target produce zero demand.
uncovered = max(0,targetUptake−soilAvailable−otherCredits); fertilizerN = uncovered/recovery; product = fertilizerN/Nfraction Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| uncoveredCropNitrogenDemandKgPerHa | Uncovered crop nitrogen demand kg per ha | number |
| modelFertilizerNitrogenKgPerHa | Model fertilizer nitrogen kg per ha | number |
| modelFertilizerProductKgPerHa | Model fertilizer product kg per ha | number |
{
"input": {
"cropNitrogenUptakeTargetKgPerHa": 100,
"soilAvailableNitrogenKgPerHa": 30,
"otherNitrogenCreditKgPerHa": 20,
"fertilizerRecoveryFraction": 0.5,
"fertilizerNitrogenMassFraction": 0.25
},
"output": {
"uncoveredCropNitrogenDemandKgPerHa": 50,
"modelFertilizerNitrogenKgPerHa": 100,
"modelFertilizerProductKgPerHa": 400
}
}Limitations and assumptions
Targets, availability and recovery are supplied assumptions. The balance does not establish crop sufficiency, environmental permission or a suitable application schedule.
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 Nitrogen Footprint: Audit declared N input/product/soil-stock balance and signed unaccounted residual per product mass; residual is not automatically environmental emission, and above-unit recovery may reveal stock depletion or omitted inputs. For a complementary task, use 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.
References
Similar or alternative tools
- Agriculture Nitrogen Footprint
Audit declared N input/product/soil-stock balance and signed unaccounted residual per product mass; residual is not automatically environmental emission, and above-unit recovery may reveal stock depletion or omitted inputs.
- 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.