On the indexes of soil moisture for summer maize

Based on the experiments during the period 1984-1987, this paper analyzes systematically the influences of soil moisture on stoma resistance, transpiration, photosynthesis, milking rate and yield. Using mathematical method and the theory of optimum segmentation, the optimum soil moisture and the drought indexes can be determined. During the period of jointing to tasseling,they are 15.5% and 10.5 (as percentage of dry weight of soil), which are 71.4% and 48.4 of field capacity respectively. But for the period of tasseling to maturing, they are 16.7% and 10.7%, which are 77% arid 49.3% of field capacity They are useful to reasonable irrigation.

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