Variable Rate Prescription Generator

Variable Rate Prescription Generator

Soil Test → Nutrient Requirement → Product Blend → Variable Rate Prescription

1. Prescription Method ▼
Distance in feet over which the Safe Range Estimate transitions from minimum range → target.
Final rates are rounded to this increment.
2. Upload Data ▼
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No shapefile loaded.
Expected soil-location field: The application looks for the soil sample Plus Code in a column named Sample ID 2 (or Grid, if your lab uses that header instead). The Plus Code is converted into latitude/longitude and spatially associated with the uploaded field boundary.
Expected lime/pH fields: For lime recommendations, the application looks for a soil pH column (pH or Soil pH), a Buffer pH column (BpH, Buffer pH, or SMP Buffer pH), and a CEC column (CEC or CEC (meq/100g)). Buffer pH is preferred when present; CEC is used as a fallback when Buffer pH is missing. See section 4b for the calibration table.
3. Products Used in Prescription ▼

Enter the guaranteed analysis as percent by weight. For example, 0-0-60 Potash = K 60%. In Single Product Blend Rate mode, these products are treated as blend ingredients and the calculated ingredient rates are converted into one total blend rate.

Product N % P % K % Ca % Mg % S % B % Cu % Fe % Mn % Zn % CCE % Unit Min Max

4. Soil Interpretation Edit optimal ranges, targets, and requirement factors ▼

These are your current optimal ranges and target values. You can edit them before generating the prescription.

Nutrient Minimum Target Maximum Requirement Factor
Requirement Factor: This is the amount of actual nutrient, in lb/ac, that the application engine will consider necessary for each one-unit increase in the soil test value. These values should be calibrated to your soil-test method, CEC, crop, soil depth and agronomic recommendations before using the generated prescription operationally.
4b. Lime Program (pH Management) Calibrate the Buffer pH lime-requirement table and fallback factors ▼

The desired pH for each point is taken from the pH row in section 4 (Soil Interpretation) and follows whichever Prescription Method is selected in section 2 — Target, Range, or Safe Range Estimate — exactly like the other nutrients.

The pH the Buffer pH table below assumes you are correcting to. Requirement is scaled down if the desired pH for a point is less than this.
Tons ENP/ac per CEC unit per pH unit needed to raise. Used only when Buffer pH is missing for a row but CEC is present.
Tons ENP/ac per pH unit needed to raise. Last-resort fallback when neither Buffer pH nor CEC is present.
Rounds lime product rates to this many lb/ac. Product min/max rates are pulled from the Product Input section.

Buffer pH ENP Required (tons/ac to reach Reference Target pH)

Buffer pH Table: These starting values are a generic, illustrative approximation of a Buffer pH → lime-requirement relationship (in tons of effective neutralizing power, ENP, per acre, to reach the Reference Target pH above). Buffer pH methods (SMP, Mehlich, Adams-Evans, Woodruff, etc.) each have their own calibration curve — replace these values with the table published for the specific buffer method your lab uses before relying on this operationally.
Product CCE: For any product checked as Lime in section 3, the ENP requirement (tons/ac) is divided by that product's CCE % (Calcium Carbonate Equivalent, entered as percent by weight) to get the actual product application rate: Product Rate = ENP Required ÷ (CCE ÷ 100). A product with CCE below 100% needs a heavier rate to supply the same neutralizing power as pure calcium carbonate.
5. Generate Prescription ▼
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