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低产和高产的玉米杂交种对土壤缺水的反应为育种工作者提供了非常有价值的资料。玉米产量的提高归因于诸多因素,如空秆率减少,粒重增加,较长的灌浆期,较大的叶面积或较长的持绿时间等。Duvick和Cast等(1984)观察到新杂交种比旧栽培种在土壤有效水降低的环境下有较好的产量。可是,关于干旱对高
The response of low-yield and high-yielding maize hybrids to soil water deficit has provided valuable information for breeders. The increase in maize yield is due to many factors such as reduced stalk ratio, increased grain weight, longer grain filling, larger leaf area, or longer green holding time. Duvick and Cast et al. (1984) observed that new hybrids had better yields than the older cultivars under conditions of reduced soil available water. However, on the high drought