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This article in AJ

  1. Vol. 75 No. 6, p. 903-907
     
    Received: May 10, 1982
    Published: Nov, 1983


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doi:10.2134/agronj1983.00021962007500060012x

Interactions among a Herbicide Program, Nitrogen Fertilization, Tarnished Plant Bugs, and Planting Dates for Yield and Maturity of Cotton

  1. Michael J. Gaylor,
  2. G. A. Buchanan,
  3. F. R. Gilliland and
  4. R. L. Davis2

Abstract

Abstract

The influence of a maximum herbicide program, N rates, tarnished plant bugs [Lygus lineolaris (Palisot de Beauvois)], planting date, and interactions among these treatments on cotton (Gossypium hirsutum L.) was determined under field conditions on a Dewey silt loam (clayey, kaolinitic, thermic, Typic Paleudult) soil. High rates of herbicides caused early phytotoxicity and reduced earliness in all 3 years of this study. Total yields were reduced by herbicides in 1976 and 1978. In 1977, compensation for early season herbicide injury by the early-planted cotton apparently resulted in higher yields in the herbicide treated plots than in untreated plots. Generally, the herbicide program reduced earliness and yields most under conditions where the potential yield was greatest (early planting, high N rates, and effective tarnished plant bug control). Yield reductions due to the herbicide program were not additive with reductions due to other factors. Effects of variable N rates on yield were inconsistent. Tarnished plant bugs reduced total yields in cotton planted late in 1976, but because early-planted cotton had time to compensate for damage, plant bug infestations resulted in no yield loss in the early 1976 planting and in increased total yields in cotton planted early in 1977. Because of complex interactions among production practices, interdisciplinary research is needed to design optimum production systems.

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