Tall and Semidwarf Wheat Response to Dryland Planting Systemsv1
- S. R. Winter and
- 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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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