关键词: 播期, 播期, 大豆, 生长状况, 产量

Abstract: To obtain reasonable irrigative control indexes of summer maize, based on the results of two-year control experiments, we comprehensively evaluated the water consumption, yield and water use efficiency (WUE) of summer maize by the weighted grey correlation comprehensive evaluation. The results showed that: compared with the measured yield, water consumption and WUE of each treatment from high to low, the single level value ranking of the yield, water consumption and WUE was basically consistent, which was feasible to optimize drought stress control indexes of summer maize; with the increase of drought stress degree, the evaluation value of the yield and water consumption was decreased; the value of WUE increased first and then decreased; the results of multi-level comprehensive evaluation showed that: the weight of WUE was the largest; the comprehensive evaluation value decreased with the increase of the degree of drought stress in each reproductive period, indicating that the treatment of mild drought stress was optimal in the same reproductive period; in the two-year control experiment, the optimal water treatment was suitable for the control group, followed by mild drought in the grouting stage and mild drought in the seedling stage. Considering the production practice of summer maize in Henan, we suggest that the minimum irrigation water is controlled at the seedling stage, jointing stage, tasseling stage and maturity stage to be 60%, 70%, 75% and 60% of the field water holding rate, respectively, ensuring the water saving and stable production of summer maize.