A rapid procedure for estimating nitrogen mineralization in manured soil |
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Authors: | R L Haney F M Hons M A Sanderson A J Franzluebbers |
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Institution: | (1) Department of Soil and Crop Sciences, Texas Agricultural Experiment Station, Texas A. and M. University, 2474 TAMU, College Station, TX 77843-2474, USA e-mail: f-hons@tamu.edu Fax: +1-409-8450456, US;(2) USDA-ARS Pasture Systems and Watershed Management Research Laboratory, Curtin Road, University Park, PA 16802-3702, USA, US;(3) USDA-ARS J. Phil Campbell, Sr. Natural Resources Conservation Center, 1420 Experiment Station Road, Watkinsville, GA 30677-2373, USA, US |
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Abstract: | A routine soil testing procedure for soil N mineralization is needed that is rapid and precise. Not accounting for N mineralization
can result in the over-application of N, especially in soils with a history of manure application. Our objectives were to
compare results from a recently proposed rapid laboratory procedure with: (1) long-term N mineralization under standard laboratory
conditions, and (2) actual forage N uptake from soil receiving dairy cattle (Bos taurus) manure in a 2-year field study. The rapid procedure is based on the quantity of CO2-C evolved during 24 h under optimum laboratory conditions following the rewetting of dried soil. Dairy cattle manure was
surface applied beginning in 1992 at annual rates of 0, 112, 224, or 448 kg N ha–1 to field plots on a Windthorst fine sandy loam soil (fine, mixed, thermic Udic Paleustalf) near Stephenville, Texas (32°N,
98°W). Results of the one-day CO2 procedure were highly correlated with soil N mineralized from samples collected in March of 1995 (P=0.004) and 1996 (P<0.001) and with forage N uptake (P<0.001) both years of the study. Residual inorganic N in the same soil samples was poorly correlated with soil N mineralization
and forage N uptake.
Received: 23 February 2000 |
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Keywords: | Carbon mineralization Nitrogen mineralization Soil testing Manure Nitrogen uptake |
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