WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Thursday, January 18, 2018

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6592. Sommerfeldt, T.G., C. Chang, and T. Entz. 1988. Long-term annual manure applications increase soil organic matter and nitrogen, and decrease carbon to nitrogen ratio.. Soil Sci. Soc. Am. J. 52:1668-1672.
Studied the effects of long-term annual additions of cattle feedlot manure on the accumulation, decomposition, and movement of organic matter and total N. Significant increases in SOM and total N in the first 8 and 6 yr, repsectively, were limited to the surface 30 cm of soil of both the nonirrigated and irrigated land, and were similar on both fields. Tillage did not affect the amount of accumulation. The rates of accumulation decrease with years of application such that after two or three decades, increases will be small. A model was developed to predict changes and develop guidelines for land disposal of feedlot manure.

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