已报道过玉米籽粒产量对从大约吐丝开始直到灌浆这一期间内的缺水特別敏感。然而,胁迫始期对玉米产量及产量组成的影响尚不清楚。Robins等(1953)和Denmead(1960)等均报道过,从抽雄到吐丝后一周发生胁迫会造 It has been reported that corn grain yield is particularly sensitive to water shortages from about the beginning of silking until the filling stage. However, the impact of initial stress on the yield and yield components of maize is unclear. Robins et al. (1953) and Denmead et al. (1960) reported that stress occurs one week after tasseling