Evaluation of maize lodging resistance based on the critical wind speed of stalk breaking during the late growth stage

文献类型： 外文期刊

第一作者： Xue, Jun

作者： Xue, Jun;Ming, Bo;Xie, Ruizhi;Wang, Keru;Hou, Peng;Li, Shaokun;Xue, Jun;Ming, Bo;Xie, Ruizhi;Wang, Keru;Hou, Peng;Li, Shaokun

作者机构：

关键词： Maize; Stalk lodging; Critical wind speed; Stalk strength; Cultivar

期刊名称：PLANT METHODS （ 影响因子：4.993； 五年影响因子：5.312 ）

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年卷期： 2020 年 16 卷 1 期

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收录情况： SCI

摘要： Background The accurate evaluation of the stalk-lodging resistance during the late stage of maize growth can provide a basis for the selection of cultivars, the evaluation of cultivation techniques, and timely mechanical grain harvesting. In this study, the critical wind speed of stalk breaking, plant morphology, stalk mechanical strength, and lodging rate were investigated in 10 maize cultivars to identify the parameters evaluate lodging resistance during the later growth stage of maize. Clarify the relationship with the stalk mechanical strength, critical wind speed of stalk breaking, and natural lodging rate in the field. Results The results showed that, in the late growth stage, with increasing number of days after physiological maturity, (1) the stalk lodging rate gradually increased, (2) the stalk breaking force and rind penetration strength (RPS) of the third internode above the soil gradually decreased, and (3) the critical wind speed of stalk breaking increased first and then decreased, and was highest at about 16-24 days after physiological maturity. The position of stalk lodging mostly occurred between second and fifth internodes. The torque at the base of maize plant increased as wind speed increased, and the different of torque was excited among different maize cultivars under same wind speed. Furthermore, the stalk lodging rate was significantly negatively correlated with the critical wind speed of stalk breaking. Additionally, the critical wind speed of stalk breaking was significantly positively correlated with the stalk breaking force and the RPS. Conclusion This indicates that the critical wind speed of stalk breaking is a superior way to determine the stalk lodging resistance. These results suggest that, in the late growth stage, the decrease in the stalk mechanical strength is an important reason for the decrease in the critical wind speed of stalk breaking and the increase in the lodging rate.

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