Wall chart, revised. M.S. Thesis, University of Missouri-Columbia. Soil Test Interpretation and Recommendations Handbook, Department of Agronomy, University of Missouri-Columbia. Missouri Agricultural Experiment Station Results Bulletin 1046. Forages, including hay and silage, are harvested as whole plants.
Grains result in removal of only a portion of the plant.
Rates of biosolids for pasture are based upon the necessary N to maintain the pasture, assuming manure is returned to the grazed field by the animals. The excess is not figured into the average composition values. Future research and experience with biosolids may provide some means of incorporating luxury consumption into the calculations. If you regularly use biosolids on your land, analyze the produce to determine actual removals from the site. These analyses are particularly useful with hay and silage because the vegetation of the plants are more variable in composition than grain.