OSU Organic Fertilizer and Cover Crop Calculator

Download the OSU Calculator

This Excel spreadsheet estimates nitrogen release from organic fertilizers and cover crops, and calculates costs. You can download calculators for per acre or per 1000sf calculations. Developed by Nick Andrews, Dan Sullivan, Jim Julian and Kristin Pool.

Information and resources


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 Products, Concentrates Inc., Wilbur-Ellis Company, and Bridgewell Resources for supporting this work with their donations.