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This article in AJ

  1. Vol. 79 No. 4, p. 641-645
    Received: June 12, 1986

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Tall and Semidwarf Wheat Response to Dryland Planting Systemsv1

  1. S. R. Winter and
  2. A. D. Welch2



Dryland winter wheat (Triticum aestivum L.) yields on the Southern Great Plains are almost always limited by crop water deficits. This research was conducted to determine if a wide-row planting system in combination with a high-yielding, semidwarf wheat would increase plant height, leaf conductance, leaf water potential, and grain yield of dryland wheat. ‘Scout 66’, a tall wheat, and ‘TAM IDS’, a semidwarf, were planted in five row-spacing systems on Pullman clay loam soil (fine, mixed, thermic Torrertic Paleustoll) at Bushland, TX. Two narrow-row systems (0.20- and 0.25-m row spacing) and three wide-row systems (0.51-m single rows and 0.25/0.51-m and 0.25/0.76-m skip-row systems) were studied. Total soil water depletion was not affected by row-spacing system or cultivar in either year. Wide-row systems were, however, effective in economizing usage of soil water before boot stage so more water was available in widerow systems during later growth stages in 1985. As a result, leaf conductance and leaf water potential at the boot stage in 1985 were increased from 2.21 mm s−1 and −1.38 MPa, respectively, in wheat growing in the 0.20-m row-spacing system, to 4.24 mm s−1 and −0.85 MPa in wheat growing in the 0.51-m row-spacing system. Wide-row systems increased plant height of TAM 105 by 0.07 m. While using semidwarf wheat in wide-row systems was successful in reducing crop water deficit and increasing plant height, grain yield was reduced in wide-row systems compared to narrow-row systems for both tall and semidwarf wheat.

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