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对不同种植模式作物进行补灌的产量及水分效应研究表明 ,在自然降雨基础上补灌 45 mm和 90 mm水 ,各种植模式的产量及水分利用效率均较对照大幅度提高。初步确定出在作物生长前期降雨较多的丰水年 ,三种种植模式的适宜补灌定额为 90 mm。三种种植模式中作物的最佳补灌时期及适宜补灌量分别为 :单作小麦播前沟灌 8mm,孕穗期补灌 82mm;单作地膜玉米在大喇叭口期一次补灌 90 mm;带田小麦播前沟灌 4mm,拔节期和孕穗期各补灌 19mm,带田地膜玉米在拔节期和大喇叭口期各补灌 2 4 mm。该结论适宜于北方旱地农田推广应用。
The study on the yield and water effect of paddy irrigation with different cropping patterns showed that the yield and water use efficiency of all cropping patterns were significantly increased compared with the control when supplemented with 45 mm and 90 mm water on the basis of natural rainfall. The hydroponic period with more rainfall during early growth stage of the crop was preliminarily determined, and the appropriate quota for the three planting patterns was 90 mm. The optimum filling period and suitable filling amount of the crops in the three planting modes were as follows: 8mm for single wheat before planting and 82mm for filling at booting stage; Field wheat before sowing irrigation 4mm, jointing and booting stage of each fill irrigation 19mm, field plastic film corn in the jointing stage and the big bell mouth of the filling 24mm. This conclusion is suitable for the popularization and application of dry farmland in northern China.