Worksheet for Calculating Biosolids Application Rates in Agriculture

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Dan M. Sullivan, Deirdre Griffin LaHue, Biswanath Dari, Andy I. Bary and Craig G. Cogger
PNW 511 | Revised March 2023, Reviewed 2023

Summary

Biosolids are a byproduct of municipal wastewater treatment. Raw sewage solids must be processed to meet U.S. Environmental Protection Agency standards before they can be called biosolids. This worksheet provides step-by-step instructions for calculating an application rate of municipal biosolids, based on satisfying crop nitrogen need.

About the authors

Deirdre Griffin LaHue
Sustainable soil management specialist and assistant professor
Washington State University
Biswanath Dari
Agronomist and assistant professor
Department of Crop and Soil Science, Oregon State University
Andy I. Bary
Senior scientific assistant
Department of Crop and Soil Sciences, Washington State University
Craig G. Cogger
Extension soil scientist (emeritus)
Department of Crop and Soil Sciences, Washington State University

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