What is the appropriate method for calculating agronomic rate for applying biosolids?
A. Michigan Part 24 Rules defines agronomic rate, in part, as “the calculated biosolids application rate which provides the amount of plant-available nitrogen (PAN) needed by the crop or vegetation grown on the land . . .” The two most commonly utilized methods for calculating PAN in Michigan are the 1 year PAN and the multiyear PAN methods. Michigan recommends facilities utilize the multiyear PAN, which involves calculating the amount of mineralized nitrogen that becomes available from land application having occurred to the site in the previous 3 years. Guidance on calculating multiyear PAN can be obtained from Appendix E of the RMP Development Document. Calculating agronomic rate also requires determining the nitrogen needs of the crop for a realistic yield goal. Nitrogen needs of the intended crop can either be obtained from Michigan State University Cooperative Extension Bulletin or directly from the soil test. However, if you base application rates on the soil test, you need to m
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