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MANAGEMENT OF UREA-CONTAINING FERTILIZERS FOR NO-TILLAGE CORN USING NITROGEN STABILIZERS AND COATED-GRANULE TECHNOLOGY

No-tillage production systems are being used by an increasing number of producers in the Great Plains, however, the large amount of surface residue left on the soil surface can made nitrogen (N) management difficult. There are several products currently available for use with granular urea (46% N) and urea-ammonium nitrate solution (UAN) that have the ability to reduce or eliminated N losses. The objective of this study was to evaluate the effectiveness of several N-fertilizer additives and a slow-release polymer coated urea product in a no-tillage corn (Zea mays L.) production system. A 3-year field experiment was conducted from 2006–2008 at the North Central Kansas Experiment Field, located near Scandia, KS, on a Crete silt loam soil (fine, montmorillonitic, mesic Pachic Arquistoll). When averaged over the 3-years of the experiment, the treated fertilizer products yielded greater than untreated urea or UAN. This occurred regardless of applied N-rate. The additive treated products along with the time release-polymer coated urea yield the same as ammonium nitrate. There were no significant differences among additive products. If producers wish to broadcast urea-containing N-fertilizer on the soil surface in high-residue production systems there are several N- additive options available that limit N loses and maximize grain yield with reduced environmental risk