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NUTRIENT DYNAMICS IN SOILS RECEIVING CHEMICALLY TREATED DAIRY MANURE

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Pp. 655-665 in the Ninth International Animal, Agricultural and Food Processing Wastes Proceedings of the 12-15 October 2003 Symposium (Research Triangle Park, North Carolina USA), Publication Date 12 October 2003.  701P1203.(doi:10.13031/2013.15305)
Authors:   M. Kalbasi and K. G. Karthikeyan
Keywords:   Chemical treatment, dairy manure, manure application, phosphorus, nitrate, ammonium, manure management, alum, lime, ferric chloride

Chemical treatment of animal manure with Al, Fe, and Ca salts appears capable of concentrating P in a smaller volume thereby providing increased manure management options. However, very little information is available on the fate of nutrients in soils receiving chemically treated manure. An incubation study was conducted with 3 soils (I, II, and III with 12, 66, and 94 mg/kg Bray-1 P), 4 manure treatments (1 untreated; 3 chemically [alum – Al; FeCl3 - Fe, lime - Ca] treated), at 2 rates (25 and 50 kg P/ha), and a control (no manure). Sub-samples were analyzed for water-extractable NO3 - and NO2 -, K+-exchangeable NH4 + and water-soluble P (WSP) after each incubation time (1 d, 1 & 2 w, 1, 3 & 6m, and 1 y). NO3 - release was controlled by treatment type (untreated > Al-treated > Fe-treated > Ca-treated > control) and manure application rate and increased sharply between 1 d and 1 or 2 w and then slowly at longer incubation periods. In contrast, K+-exchangeable NH4 + exhibited a sharp decrease during the first week and then remained relatively constant for up to 1 year. WSP increased when soils received untreated or Ca-treated manure with the magnitude being proportional to the rate of manure (i.e., P) applied. WSP, however, decreased (compared to control) for soils II and III (high Bray-1 P) or slightly increased for soil I (low Bray-1 P) with application of Al or Fe-treated manure. WSP decreased sharply between 1 d and 1 or 2w incubation and then remained relatively constant or increased slightly up to 1 y depending on treatment and soil type. Addition of Al or Fe treated manure decreases P solubility, with the effect more pronounced in soils with high background P.

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