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研究结果表明 ,农田耗水主要在 1m以上土层 ,玉米对 0～ 50cm土层的水分利用率达6 0 % ;玉米农田棵间土壤水分蒸发占农田蒸散的 4 7 6 %～ 77 5% ,整个生育期棵间蒸发与叶面积指数呈负相关 ,玉米产量与蒸腾量呈正相关 ;秸秆覆盖可有效减少棵间土壤水分蒸发 ;合理施肥能促进玉米对土壤水分的利用
The results showed that the water consumption of farmland was mainly above 1 m soil layer, and the water use efficiency of maize to 0-50 cm soil layer was 60%. Soil water evaporation among farmland fields accounted for 47.6% -77.5% of farmland evapotranspiration, There was a negative correlation between evaporation and leaf area index during the whole growth period, and there was a positive correlation between corn yield and the amount of transpiration. Straw mulching could effectively reduce soil water evaporation and the rational fertilization could promote corn utilization of soil moisture