集雨补灌条件下旱塬小麦玉米带田节水灌溉试验研究

对旱塬地区小麦套作玉米带田集雨限量补灌条件下带田产量、水分利用效率、叶日积(LAD)及作物复合群体生长率(CGR)进行了分析研究,认为该区发展小麦玉米带田限量补灌(35mm)的最佳生育时期为小麦抽穗期和玉米抽雄开花期,有条件时灌2水以小麦抽穗期、玉米抽雄开花期和小麦扬花期、玉米吐丝期为宜。这与各处理0～90cm土层水分利用效率的大小表现一致。带田复合群体总LAD、平均CGR灌水与不灌水处理间差别不明显,说明LAD、CGR并非单一水分因素所致,水分条件的改善对此二者的作用仅为其中一个方面,今后的栽培管理中也应重视其它方面如增施有机肥等。

Study on Water-saving Irrigation in Intercropped Wheat and Maize under Supplemental Irrigation with Water Harvesting in Dryland

The yield ( Ye ), water use efficiency ( WUE ), leaf area duration (LAD ), and crop growth rate ( CGR ) in the compound canopy of intercropped wheat and maize were analyzed under limited supplemental irrigation with water harvesting in dryland. The result suggested that the optimum growth stages of compound canopy under 35 mm irrigation were heading of wheat and heading and anthesis of maize, while anthesis of wheat and silking of maize were also concerned under a better conditions, so was WUE performance in 90 cm depth of soil layer. The differences in LAD and CGR among all the treatments were not so obvious, which indicated that the changes of LAD and CGR were not caused only by water. Thus, other aspects such as additional application of organic fertilizer should also be stressed in future culture and management of intercropped crops.