Stock Solution Nitrogen PPM Target

Invert exact final-flow stock replacement and source-water nitrogen to fertilizer stock mass, assuming stock is made in nitrogen-free water; not DAP nitrogen contribution, solubility validation or a crop dosing recommendation.

Description

Injected stock replaces a fraction of the final water flow.

Injected stock replaces a fraction of the final water flow. Source-water nitrogen remaining in the other fraction must be included in the final concentration balance.^[1]

When to use Stock Solution Nitrogen PPM Target

Use this tool to invert exact final-flow stock replacement and source-water nitrogen to fertilizer stock mass, assuming stock is made in nitrogen-free water; not DAP nitrogen contribution, solubility validation or a crop dosing recommendation.

Prepare the plant, nutrient, light or scheduling measurements for the intended crop and period. Keep paired records aligned and confirm units and supplied target values.

How to use Stock Solution Nitrogen PPM Target and understand its results

Prepare the plant, nutrient, light or scheduling measurements for the intended crop and period. Keep paired records aligned and confirm units and supplied target values.
Enter targetFinalNitrogenMgPerLiter, sourceWaterNitrogenMgPerLiter, stockVolumeLiters, stockFractionOfFinalFlow, fertilizerNitrogenMassFraction, fertilizerAssayPurityFraction using the field table and calculation rules, then run the tool.
Read requiredStockNitrogenMgPerLiter, requiredFertilizerGrams. 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
targetFinalNitrogenMgPerLiter	Target final nitrogen mg per liter	number	Required
sourceWaterNitrogenMgPerLiter	Source water nitrogen mg per liter	number	Required
stockVolumeLiters	Stock volume liters	number	Required
stockFractionOfFinalFlow	Stock fraction of final flow	number	Required
fertilizerNitrogenMassFraction	Fertilizer nitrogen mass fraction	number	Required
fertilizerAssayPurityFraction	Fertilizer assay purity fraction	number	Required

Enter positive stock volume and stock, nitrogen and purity fractions in (0,1]. Use nonnegative mg/L concentrations and target at least source concentration. Calculate required stock nitrogen and fertilizer mass, assuming stock water has no nitrogen.

stock N=source N+(target N−source N)/stock fraction; fertilizer g=stock N × stock liters/(1000 × N fraction × purity)

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
requiredStockNitrogenMgPerLiter	Required stock nitrogen mg per liter	number
requiredFertilizerGrams	Required fertilizer grams	number

json

{
  "input": {
    "targetFinalNitrogenMgPerLiter": 100,
    "sourceWaterNitrogenMgPerLiter": 10,
    "stockVolumeLiters": 20,
    "stockFractionOfFinalFlow": 0.01,
    "fertilizerNitrogenMassFraction": 0.2,
    "fertilizerAssayPurityFraction": 0.9
  },
  "output": {
    "requiredStockNitrogenMgPerLiter": 9010,
    "requiredFertilizerGrams": 1001.111111111111
  }
}

Limitations and assumptions

Targets below source are rejected even if dilution might otherwise be possible. Solubility, chemical compatibility and crop suitability are not checked.

Numeric inputs and returned numeric values must be finite; an unrepresentable returned value produces an error. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use EC MS CM Correction Factor: Normalize uncompensated solution EC to supplied reference temperature using sample-specific linear coefficients; an already compensated instrument bypass avoids double correction. For a complementary task, use Peat Perlite Bark Blend Ratio Mixer: Scale caller peat/perlite/bark loose-volume ratios to a calibrated settled blend volume and balance dry/water masses; no additive pore-volume, pH or fertility guarantee.

References

Stock Solution Nitrogen PPM Target — tool.io

Similar or alternative tools

EC MS CM Correction Factor
Normalize uncompensated solution EC to supplied reference temperature using sample-specific linear coefficients; an already compensated instrument bypass avoids double correction.
Peat Perlite Bark Blend Ratio Mixer
Scale caller peat/perlite/bark loose-volume ratios to a calibrated settled blend volume and balance dry/water masses; no additive pore-volume, pH or fertility guarantee.