Sequia y caracteres fenologicos, morfologicos y fisiologicos en trigo.
1988
Cabanas Cruz B. | Munoz Orozco A. | Kohashi Shibata J.
Six wheat varieties known for their outstanding yield under drought in rainfed areas were evaluated at Montecillo, State of Mexico, for their resistance to drought using the watering-drought method. Under this method, plants which had never been under normal watering were subjected to two drought treatments of variable lenght covering the early flowering period (S1), and after flowering (S2). Normal watering was resumed afterwards. The control (S0) consisted of normal irrigation throughout the cycle. Both drought treatments affected significantly the reproductive stage, and grain yield (kg of seed per m*2) decreased by 17.3 percent at S1 and 24.0 percent at S2 in comparision to S0. This reduction was associated with a reduction of dry matter production, relative growth rate, leaf area index, leaf area duration and leaf area ratio, spike lenght, plant height, and days to anthesis. Two out of the six varieties (Zac-2 and Mex-82) were the most resistant to drought. They exhibited the highest average seed yield and the lowest reduction in yield due to the effect of drought.
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