How do I calculate fertilizer application rate?

Rate (kg/ha) = Required nutrient (kg/ha) ÷ (Fertilizer grade % / 100). For 50 kg/ha N using 46-0-0 urea: 50 ÷ 0.46 = 108.7 kg urea/ha.

What do the N-P-K numbers mean?

N-P-K represents the percentages of nitrogen (N), phosphate (P₂O₅), and potash (K₂O) by weight. 10-10-10 contains 10% of each.

How often should I apply fertilizer?

Most crops benefit from split applications. Nitrogen especially should be split to reduce leaching and volatilization losses.

Fertilizer Rate Calculator — N-P-K Application

How It Works

Calculate fertilizer application rates based on soil test results, crop requirements, and field area. Supports N-P-K nutrients and multi-nutrient blends

Each component has a specific meaning:

Soil test results — The soil test results recorded for the scenario being assessed.
Crop requirements — The crop requirements recorded for the scenario being assessed.
Field area — The field area recorded for the scenario being assessed.

Note: Interpret the fertilizer rate result against the thresholds and context described above.

How to Use

Enter the soil test results, crop requirements, field area for the scenario you are assessing. Calculate fertilizer application rates based on soil test results, crop requirements, and field area. Supports N-P-K nutrients and multi-nutrient blends. Use the fertilizer rate result to inform your calculation.