不同水分梯度下玉米水分利用效率研究

Water Use Efficiency of Maize Hybrids in Soil Moisture Grades

对4种不同水分梯度下18个不同基因型玉米品种水分利用效率进行了二因素裂区设计试验研究,结果表明:在雨养条件下,农大108、丹玉86、中玉9号、东单60号、沈玉18号5个基因型品种抗旱性强、水分利用效率(WUE)高,经济系数亦高;在补灌60,100,160 mm条件下,先玉335号和郑单958两个基因型品种在各种补灌条件下均表现高产,而且WUE和经济系数均高;从补灌水增产值的WUE角度看,随补灌水量的增加,增产值的WUE在下降,说明实行节水灌溉(非充分灌溉)有利于提高水分利用效率;补灌水对产量构成因素影响最大的是每穗结实粒数。

With experiment of 2 -factors split design in field, 18 genotype maize hybrids＇water use efficiency （WUE） were studied under 4 soil moisture grades. The results showed the drought tolerance, WUE, and harvest index （HI） of Nongda 108, Danyu.86, Zhongyu 9 , Dongdan 60 and Shenyu 18 were higher than those of the others under rain -fed condition. The yield, WUE, and HI of Xianyu 335 and Zhengdan. 958 were the best under 60mm, 100mm, and 160mm supplemental irrigation conditions. The increase yield of unit supplemental irrigation water was decreased, so as WUE. It showed water - saving irrigation （deficit irrigation） can increase maize WUE. The numbers per ear, a yield composing factor, was influenced most by supplemental irrigation.