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Project Details:
References
Justification
Methodology
Justification
Earlier research in Alberta and North Dakota showed that using larger granules of urea compared to regular sized ag-grade urea was a means of increasing crop yield and reducing the potential for denitrification losses by slowing down nitrification of urea nitrogen (N) (Nyborg and Malhi 1979, and Goos and Johnson 1993). It is thought that a larger granule urea (up to 10 mm in diameter) that is used in helicopter applications to forestry replanting stands, and in agro-forestry plantations could be used as a broadcast application in no-till cropping systems in the Northern Great Plains (NGP). The earlier research noted above was done largely by hand application to small field research plots. Standard spin-broadcast application equipment available earlier could not achieve an even spread of the larger urea granules. More recent pneumatic floater spreaders do have the capability to handle the larger granules and achieve a reasonably even spread of granules over the spreading width of the equipment. Goos and Johnson’s research investigated the addition of a nitrification inhibitor (DCD) with the urea in different sized granules; such treated granules were not commercially available at the time of this research. Recent developments of technology now allow the treatment of different sized granules of urea with both a urease and a nitrification inhibitor (i.e. Agrotain and DCD). This study will investigate the following factors in a factorial field experiment.
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