Crop Fertility Tool

Fertilizer Rate Calculator

Convert soil test and yield goals into nutrient recommendations and fertilizer cost estimates.

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Crop

Yield goal (bu/acre)

Soil nitrate-N (lb/acre)

Soil test P (ppm)

Soil P method

Bray Olsen

Soil test K (ppm)

Organic matter (%)

Previous crop (N credit)

Field size (acres)

Manure applied

Yes

N source cost ($/ton)

P source cost ($/ton)

K source cost ($/ton)

Olsen values are converted to Bray-equivalent (x1.5) for table-based recommendation logic.

× Clear saved inputs

N Need 0.0 lb/ac

P2O5 Need 0.0 lb/ac

K2O Need 0.0 lb/ac

Elemental P / K 0.0 / 0.0 lb/ac

Cost per Acre $0.00

Total Field Cost $0.00