Organic Fertilizer and Cover Crop Calculators

This free online tool compares the nutrient value and cost of cover crops, organic and synthetic fertilizers and compost. Use this Calculator to develop well balanced and cost effective nutrient management programs for your farm. Developed by Nick Andrews, Dan Sullivan, Jim Julian and Kristin Pool.

Select a calculator for your region

Resources

Research Background

This work was sponsored by Western Sustainable Agriculture Research and Education (projects FW06-301 and FW09-328), Oregon Tilth, Inc. and the OSU Oregon Organic Cropping Research program.

We also thank Stutzman Environmental ProductsConcentrates Inc.Wilbur-Ellis Company, and Bridgewell Resources for supporting this work with their donations.