Manure Nutrient Application Rate
N-based rate = crop N need / (total N x availability), with the P2O5 and K2O delivered at that rate reported so phosphorus over-application is visible. 150 lb N/acre, 10 lb N/ton, 50% avail -> 30 ton/acre, delivering 150 lb P2O5/acre; composted manure (70%) drops it to 21.4 ton/acre. The nutrient-management plan governs.
Formula and source
avail_N_per_ton = total_N x availability%; rate = crop_N_need / avail_N_per_ton; P2O5_applied = rate x P2O5/ton; K2O_applied = rate x K2O/ton.
Nitrogen-based manure application rate and the co-applied P/K, per USDA NRCS Code 590 (Nutrient Management), by name.
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