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This article in AJ

  1. Vol. 85 No. 6, p. 1198-1203
     
    Received: Aug 14, 1992


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doi:10.2134/agronj1993.00021962008500060020x

Nitrogen Fertilization Timing Effect on Wheat Production, Nitrogen Uptake Efficiency, and Residual Soil Nitrogen

  1. Mercedes M. Alcoz,
  2. Frank M. Hons  and
  3. Vincent A. Haby
  1. Dep. of Soil and Crop Sciences and the Texas Agric. Exp. Stn., Texas A&M Univ., College Station, TX 77843-2474
    Texas A&M Univ. Agric. Res. and Ext. Center, Drawer E, Overton, TX 75684.

Abstract

Abstract

Split fertilizer N application has been proposed for improving N uptake efficiency in wheat (Triticum aestivum L.) production systems, but results have been inconsistent. In this field study, 75 and 150 kg N ha−1 was applied either all preplant or in two, three, or four split applications based on wheat growth stage (GS) to determine N timing effect on wheat yield and apparent fertilizer N recovery. Vegetative samples were also collected at Feekes GS 4, 6, and 10 to determine treatment effects on tissue N concentration during the growing season. Soil samples were collected after harvest to evaluate residual N quantity and movement in soil relative to N rate and time of application. The soil used was a Fluventic Ustochrept-Udic Chromustert intergrade. Nitrogen rate and application timing appeared to have less effect than year on yield and N parameters. Significant grain yield increases were achieved with split applications of N fertilizer when N was topdressed at GS 4 or 6 in 1989 as compared with all preplant or application at GS 10. Split N application at GS 10 produced greater grain yield than application at GS 4 or 6 in 1990. Nitrogen uptake efficiency was greatest with 75 kg N ha−1 and split application. Soil NO-3-N concentration was significantly higher at 150 kg N ha−1 than at 75 kg N ha−1. Significantly lower residual NO-3-N with the preplant treatment was not accounted for by greater grain or straw N content.

Research supported in part by the Tennessee Valley Authority, Muscle Shoals, AL.

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