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This article in AJ

  1. Vol. 93 No. 1, p. 157-163
     
    Received: Jan 26, 2000
    Published: Jan, 2001


    * Corresponding author(s): dhoward2@utk.edu
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doi:10.2134/agronj2001.931157x

Nitrogen Fertilization of No-Till Cotton on Loess-Derived Soils

  1. Donald D. Howard *a,
  2. C.Owen Gwathmeya,
  3. Michael E. Essingtonb,
  4. Roland K. Robertsc and
  5. Mike D. Mullenb
  1. a Plant and Soil Sciences Dep., Univ. of Tennessee, West Tennessee Exp. Stn., Jackson, TN 38301
    b Plant and Soil Sciences Dep., Univ. of Tennessee, P.O. Box 1071, Knoxville, TN 37901-1071
    c Agric. Economics and Rural Sociology Dep., Univ. of Tennessee, P.O. Box 1071, Knoxville, TN 37901-1071

Abstract

Information on nitrogen (N) fertilization of no-till (NT) cotton (Gossypium hirsutum L.) is needed to optimize lint yields and earliness. We evaluated five N rates and three application methods for NT cotton production on Loring silt loam (fine-silty, mixed, active, thermic Oxyaquic Fragiudalfs) with natural winter annuals as a cover; and on Memphis silt loam (fine-silty, mixed, active, thermic Typic Hapludalfs) having corn (Zea mays L.) stover as a cover and on Lexington silt loam (fine-silty, mixed, active, thermic Utlic Hapludalfs) having winter wheat (Triticum aestivum L.) as a cover. Nitrogen rates of 0, 34, 67, 101, and 134 kg ha−1 were either broadcasted as ammonium nitrate (AN) or injected as urea–ammonium nitrate (UAN) at planting. Additional treatments included broadcasting 67 kg N ha−1 as AN at planting with either 34 or 67 kg N ha−1 banded 6 wk later. Relative to no N, broadcasting 67 kg N ha−1 as AN increased 4-yr average NT lint yields on Loring silt loam from 739 to 1281 kg lint ha−1 and 2-yr average yields on Lexington silt loam from 1086 to 1535 kg ha−1 A higher N rate (101 kg N ha−1) was needed to increase 2-yr average yields on Memphis silt loam from 821 to 1169 kg ha−1 Broadcasting AN was a satisfactory placement method producing yields equal to or higher than injecting UAN or splitting AN for NT cotton produced on these loessial soils despite different covers and residues.

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Copyright © 2001. American Society of AgronomyPublished in Agron. J.93:157–163.