Reducing denitrification loss with nitrification inhibitors following presowing applications of urea to a cottonfield
1994
Chen, D.L. | Freney, J.R. (Commonwealth Scientific and Industrial Research Organisation, Canberra (Australia). Div. of Plant Industry) | Mosier, A.R. (United States Dept. of Agriculture, Fort Collins. Agricultural Research Service) | Chalk, P.M. (Melbourne Univ., Parkville (Australia). School of Agricultural and Forestry)
The effects of the nitrification inhibitors nitrapyrin, acetylene (provided by wax-coated calcium carbide), and phenylacetylene on N transformations and denitrification losses following presowing applications of urea were determined in a cottonfield in the Namoi Valley of New South Wales. When urea was applied in February (34 weeks before sowing), 84 percent of applied N was lost from the soil. Loss of applied N was reduced by addition of nitrapyrin and phenylacetylene, to 53 and 57 percent, respectively. In the absence of nitrification inhibitors, less N was lost (72 percent of that applied) from an application in May than from February application. Addition of acetylene, phenylacetylene, and nitrapyrin reduced losses over the 24 weeks to sowing to 57, 52, and 48 percent, respectively. These experiments show that N loss from presowing applications of urea can be significantly reduced by the use of nitrification inhibitors, but that the losses of N are still substantial.
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