不同生育期水分胁迫对玉米农艺性状的影响

为了研究不同生育期玉米水分胁迫对玉米农艺性状的影响,为干旱、半干旱地区玉米抗旱提供理论依据。以玉米在苗期、拔节期、抽雄-吐丝、灌浆-成熟期进行水分胁迫,测量玉米株高、穗位高、叶面积、穗部性状,对比充分灌水与非充分灌溉下玉米农艺性状差异。利用Jensen模型求解出玉米各生育期水分敏感系数,验证水分胁迫对玉米产量的影响。结果表明在拔节期进行干旱处理的株高、穗位高、叶面积受影响较大,有明显的抑制作用。抽雄—吐丝期干旱胁迫对穗部性状的形成较为明显,并且对产量影响较大。

Effects of Water Stress on Agronomic Traits of The Maize at Different Growth Stages

In order to provide theoretical basis for maize drought-resistance, an experiment is conducted to study the influence of water stress at different growth period on the agronomic traits of maize.By water stressing the maize in seeding stage, jointing stage and tasseling stage and measuring the plant height, ear height, leaf area and panicle traits, the difference of the agronomic traits of maize before and after full irrigation and fertilizing cycocel is compared.Jensen model, which has applicability in evaluating the relationgship between crop yield and water, is used to find the water sensitivity index at each growth stage.The experiment result show that the plant height reaches its maximum after spinning and water stress has the greatest restraining effect on the plant height, ear height and leaf area in jointing stage, while in tasseling stage water stress has greater effect on the agronomic traits and yield of maize.