蠡玉16玉米受旱减产规律及产量与水关系模型研究

以淮北平原地区常用玉米品种蠡玉16为试验材料,采用测坑法进行作物的受旱试验,研究主要农作物不同受旱条件下的减产规律,构建产量与水关系模型。结果表明,蠡玉16玉米关键期受旱对其产量的影响十分显著,轻旱、中旱、重旱的减产率分别为4.3%、36.8%、51.1%,且随着受旱程度的增大减产率剧增;蠡玉16玉米在抽雄灌浆期对水分亏缺最为敏感,敏感指数达0.925 1;其次是拔节期、分蘖期和乳熟期,敏感指数分别为0.126 2、0.066 2和0.003 2。水分亏缺对蠡玉16玉米产量影响最大阶段为抽雄灌浆期,同时也是需水强度最大期。

Research on the Reduced Production Rule of Drought-stricken Liyu No.16 Maize and the Relation Model Between the Yield with Waterc

A research was conducted to explore the reduced production rule of the main crops along Huaihe river in different drought-stricken conditions and the relation model between yield and water, in which Liyu No.16, a common maize in Huaibei plain area, was used as the test material and the pit measurement method was applied. The results showed that in the crucial growth period of Liyu No.16 maize, the influence of drought on its production was very significant, with the reduced production rates being 4.3% in light drought, 36.8% in moderate drought and 51.1% in severe drought respectively. Besides, the reduced production rate increased with the rise of the drought degree. In addition, Liyu No.16 maize was the most sensitive to water deficit in tasseling grouting period, and the sensitive index was 0.9251, followed by jointing stage, tillering stage and milk stage, with the sensitive index being 0.1262, 0.0662 and 0.0032, respectively.