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    Nitrogen Management Experiments for Upland and Pima Cotton, 1990

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    Author
    Silvertooth, J. C.
    Clark, L. J.
    Malcuit, J. E.
    Carpenter, E. W.
    Doerge, T. A.
    Watson, J. E.
    Issue Date
    1991
    Keywords
    Agriculture -- Arizona
    Cotton -- Arizona
    Cotton -- Soil fertility
    Cotton -- Management
    
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    Publisher
    College of Agriculture, University of Arizona (Tucson, AZ)
    Journal
    Cotton: A College of Agriculture Report
    Abstract
    Two field experiments were conducted in Arizona in 1990 at two locations ( Maricopa and Safford). The purposes of the experiments were to validate and refine nitrogen (N) fertilization recommendations for both Upland and Pima cotton. The experiments each utilized N management tools such as pre - season soil tests for NO₃⁻-N, in-season plant tissue testing (petioles) for N fertilirystatus, and crop monitoring to ascertain crop fruiting patterns and crop N needs. Results at both locations revealed a strong relationship between the crop fruit retention levels and N needs for the crop. This pattern was further reflected in final yield analysis in response to the N fertilization regimes used. At Maricopa, fruit retention levels were low, petiole NO₃⁻-N concentrations relatively high, and yield responses to higher and later applications of fertilizerN were negative. At Safford, fruit retention levels were higher, petiole concentrations of NO₃⁻-N reflected strong crop demand, and a positive response to rates of fertilizer N up to 170 lbs. N/acre was measured.
    Series/Report no.
    370087
    Series P-87
    Collections
    Cotton Report 1991

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