Precision Fertilizer Rate Calculator

Calculate variable rate fertilizer application from soil test levels, target PPM, and crop nutrient removal.

Soil Test Level

ppm

Target Soil Level

ppm

Crop Removal

lbs/ac

Fertilizer Nutrient Content

Fertilizer Cost

$/ton

Field Size

acres

Tab to move between fields

Fertilizer Rate

163 lbs/ac

Total Cost

$8,478.26

≈ 8 smartphones

Nutrient Deficiency15 ppm

Total Nutrient Need75 lbs/ac

Cost per Acre$52.99

Total Fertilizer13.04 tons

How to Use This Calculator

Enter Soil Test Level, Target Soil Level, and Crop Removal.
Set Fertilizer Nutrient Content, Fertilizer Cost, and Field Size.
Review Fertilizer Rate (lbs/ac) and Total Cost ($).
Use Nutrient Deficiency (ppm) and Total Nutrient Need (lbs/ac) to inform your decision.
Use the chart to visualize the results and explore different scenarios by adjusting inputs.

How the result changes with Fertilizer Nutrient Content

Fertilizer Nutrient Content	Fertilizer Rate	Total Cost
11	681.8 lbs/ac	$35,454.55
36	208.3 lbs/ac	$10,833.33
65	115.4 lbs/ac	$6,000.00
90	83.3 lbs/ac	$4,333.33

Soil Test Level: Current soil nutrient level from lab analysis.
Target Soil Level: Desired soil nutrient level for optimal production.
Crop Removal: Nutrient removed by harvested crop (lbs per acre).
Fertilizer Nutrient Content: Nutrient analysis of fertilizer product (e.g., DAP = 46% P2O5).
Fertilizer Cost: Price per ton of fertilizer product.
Field Size: Total acres for this zone or field.

Identify Input Parameters
4 parameters
Soil Test Level = 15, Target Soil Level = 30, Crop Removal = 45, Fertilizer Nutrient Content = 46 = 6 input(s) provided
Calculate Fertilizer Rate
Fertilizer Rate
163 = 163
Calculate Total Cost
Total Cost
8478.26 = $8,478.26
Calculate Nutrient Deficiency
Nutrient Deficiency
15 = 15
Calculate Total Nutrient Need
Total Nutrient Need
75 = 75