Using corn hybrid Kehe 28 as material , the effects of drought stress on growth , development , physiological and biochemical characters and photosynthetic characteristics of corn in field were studied in Wu -wei City .The results showed that long -term drought stress made corn leaf curl , reduced the leaf area , de-creased the plant height , reduced the number of leaves per plant and dry matter accumulation , decreased the ear volume , declined the grain weight per spike and hundred grain weight , and the yield decreased sharply and almost total crop failure under extreme drought conditions .Drought stress also decreased the stomatal con-ductance , made stoma close , declined photosynthetic capacity and net photosynthetic rate , and inhibited the plant growth .
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