Long-Term Cattle Manure Plots.
Hao, X. and Benke, M.B. (2012). "Long-Term Cattle Manure Plots.", Prairie Soils and Crops, 5, pp. 132-138.
A field experiment was started in 1973 to determine the safe loading capacity of soil with cattle feedlot manure. Manure was applied annually at 0, 30, 60, and 90 tonne ha-1 (wet weight) under rainfed and 0, 60, 120, and 180 tonne ha-1 under irrigated conditions. The long-term manure applications resulted in increased levels of organic matter, N, P, salt and trace minerals in soil. This increased straw yield at all manure rates, but reduced grain yields at higher rates and affected crop quality. Increased nutrient levels also increase the potential for nutrient losses and surface and groundwater contamination. The soil enrichments were long-lasting and could pose environmental threats long after application has ceased.
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