Differences between Two Grain Sorghum Genotypes in Adaptation to Drought Stress. 11* Root Water Uptake and Water Use

摘要

A study of two sorghum hybrids, E-57 and TX-671, indicated that differences in grain yield under nconditions of low rainfall were associated with increased extraction of soil water at depth. E-57 used nless water before anthesis than did TX-671, which was more than compensated for by increased water nuse after anthesis. As soil water declined in a drying cycle, TX-671 tended to restrict its water use at na higher water content than E-57. The implication of these results is discussed.