![]() ![]() ![]() The effectiveness of a P-based application system of animal manure composts has not been reported for paddy fields. Annual P-based manure or compost treatments had similar available soil P levels to the original soil P level before treatment application. Eghball and Power (1999) reported that annual or biennial beef cattle manure applicatio or compost application based on N or P requirements of corn engendered corn yields that were similar to those for fertilizer application. An application system of animal manure compost without increasing soil P levels is needed to establish environmentally conscious agriculture. The accumulated P can cause water system eutrophication through surface runoff and soil erosion (Sharpley, 1999). ![]() ![]() Consequently, excess P accumulates in the soil. When animal manure composts were applied based on Nitrogen (N) amounts that meet crop requirements, the associated amounts of Phosphorus (P) applied were greater than the crop demand. Generally, animal manure composts have lower Nitrogen-to-Phosphorus ratios (N/P ratio) than those of crop uptake. Excessive application of animal manure composts engenders soil phosphorus accumulation. ![]()
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