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Cotton Nitrogen Management in the Southwest Region

Frank M. Hons, Robert G. Lemon, and Mark L. McFarland

ABSTRACT

Nitrogen is the most frequently applied nutrient for cotton production in the Southwest Region (Texas and Oklahoma) and is also the most difficult to manage because of its reactivity and mobility. Inadequate nitrogen (N) reduces fruiting sites and yield, whereas excess N can create rank growth, lower yield and quality, and increase problems with disease, insects, and defoliation. Recommended N rates are normally based on a realistic yield goal and modified by residual soil nitrate (NO3) to a 2-ft depth. Significant residual profile NO3 concentrations in both Texas and Oklahoma indicate that additional research is needed to determine the scope of the problem, to identify the sources/reasons for these levels, and to develop management plans to reduce these concentrations.





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Document last modified April 16, 2003