夏秋季节性干旱对南方春玉米主要农艺性状的影响研究

Effect of summer and autumn seasonal drought on the agronomic characteristics of southern spring maize

试验研究了我国南方地区夏、秋季节性干旱条件下春玉米主要农艺性状的变化,结果表明,夏、秋季节性干旱使玉米线性灌浆期、叶面积稳定期及生育期缩短,秃顶增加,穗粒数减少,千粒重降低,产量下降,其中对晚熟品种影响较大,中熟品种次之,早熟品种较小,且不同品种减产幅度不同。根据其影响的大小可选出抗旱能力较强的春玉米品种。

Agronomic characteristics of the southern spring maize were studied in summer and autumn seasonal drought periods in southern China. The results show that growth, linear filling and stable leaf area periods are shortened by summer and autumn seasonal droughts, which result in increased ear baldness, decreased ear panicle and 1000-grain weight, and yield loss. Seasonal drought effects on the early maturity maize variety is lowest among the early,middle and late maturity maize varieties;and that for the middle maturity is lower than the late maturity variety. The degree of yield decrease is different for the different varieties. Thus the study shows that it is possible to analysis drought-resistance of maize varieties by agronomic characterization.