Water Soluble Fertilizer Calculator
Calculate the dry weight of water-soluble fertilizer required to mix a target nutrient dilution in your irrigation tank.
Input Parameters
Enter details for calculation.
Dry Fertilizer Weight
Expert Tip
Check irrigation water EC (Electrical Conductivity) after mixing. Over-fertilizing plants causes leaf margin burn and nutrient lockout.
Calculation Methodology & Details
Formula
Computes fertilizer weight to achieve target nitrogen concentrations. The constant 75 is derived from the fact that 1 oz of 100% nutrient in 100 gal = 75 ppm.
Important Disclaimer
The calculations provided are for educational and general planning guidelines only. They do not replace professional agronomic advice or certified agricultural testing.
How to Dilute Water Soluble Fertilizer
Follow these steps to mix irrigation solutions:
Determine Target ppm
Choose dilution target (typical vegetative growth is 100-200 ppm N).
Verify Tank Volume
Measure the volume of water in your irrigation reservoir.
Check Nitrogen Grade
Enter the nitrogen percentage from fertilizer NPK numbers.