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Key indicators affecting maize stalk lodging resistance of different growth periods under different sowing dates
Journal of Integrative Agriculture ( IF 4.8 ) Pub Date : 2020-09-10 , DOI: 10.1016/s2095-3119(20)63259-2
Qun WANG , Jun XUE , Jiang-lu CHEN , Ying-hu FAN , Guo-qiang ZHANG , Rui-zhi XIE , Bo MING , Peng HOU , Ke-ru WANG , Shao-kun LI

The accurate evaluation of maize stalk lodging resistance in different growth periods enables timely management of lodging risks and ensures stable and high maize yields. Here, we established five different sowing dates to create different conditions for maize growth. We evaluated the effects of the different growth conditions on lodging resistance by determining stalk morphology, moisture content, mechanical strength and dry matter, and the relationship between stalk breaking force and these indicators during the silking stage (R1), milk stage (R3), physiological maturity stage (R6), and 20 days after R6. Plant height at R1 positively affected stalk breaking force. At R3, the coefficient of ear height and the dry weight per unit length of basal internodes were key indicators of stalk lodging resistance. At R6, the key indicators were the coefficient of the center of gravity height and plant fresh weight. After R6, the key indicator was the coefficient of the center of gravity height. The crushing strength of the fourth internode correlated significantly and positively with the stalk breaking force from R1 to R6, which indicates that crushing strength is a reliable indicator of stalk mechanical strength. These results suggest that high stalk strength and low ear height benefit lodging resistance prior to R6. During and after R6, the coefficient of the center of gravity height and the mechanical strength of basal internodes can be used to evaluate plant lodging resistance and the appropriate time for harvesting in fields with a high lodging risk.



中文翻译:

影响不同生育期不同生育期玉米秸秆抗倒伏性的关键指标

准确评估不同生育期玉米秸秆的抗倒伏能力,可以及时管理倒伏风险,并确保稳定和高产的玉米。在这里,我们确定了五个不同的播种日期,为玉米生长创造了不同的条件。我们通过确定茎的形态,水分含量,机械强度和干物质,以及在吐丝期(R1),乳期(R3),茎断裂力与这些指标之间的关系,评估了不同生长条件对抗倒伏性的影响。生理成熟阶段(R6),以及R6之后的20天。R1处的植物高度积极影响茎的断裂力。在R3,穗高系数和基底节间单位长度的干重是茎秆抗倒性的关键指标。在R6,关键指标是重心高度系数和植物鲜重。在R6之后,关键指标是重心高度的系数。第四节间的抗压强度与从R1到R6的秸秆断裂力呈显着正相关,表明抗压强度是秸秆机械强度的可靠指标。这些结果表明,高茎秆强度和低耳高有益于R6之前的抗倒伏性。在R6期间和之后,可以使用重心高度的系数和基节间的机械强度来评估植物的抗倒伏性和在高倒伏风险的田间收获的合适时间。关键指标是重心高度的系数。第四节间的抗压强度与从R1到R6的秸秆断裂力呈显着正相关,表明抗压强度是秸秆机械强度的可靠指标。这些结果表明,高茎秆强度和低耳高有益于R6之前的抗倒伏性。在R6期间和之后,可以使用重心高度的系数和基节间的机械强度来评估植物的抗倒伏性和在高倒伏风险的田间收获的合适时间。关键指标是重心高度的系数。第四节间的抗压强度与从R1到R6的秸秆断裂力呈显着正相关,表明抗压强度是秸秆机械强度的可靠指标。这些结果表明,高茎秆强度和低耳高有益于R6之前的抗倒伏性。在R6期间和之后,可以使用重心高度的系数和基节间的机械强度来评估植物的抗倒伏性和在高倒伏风险的田间收获的合适时间。这表明抗压强度是秸秆机械强度的可靠指标。这些结果表明,高茎秆强度和低耳高有益于R6之前的抗倒伏性。在R6期间和之后,可以使用重心高度的系数和基节间的机械强度来评估植物的抗倒伏性和在高倒伏风险的田间收获的合适时间。这表明抗压强度是秸秆机械强度的可靠指标。这些结果表明,高茎秆强度和低耳高有益于R6之前的抗倒伏性。在R6期间和之后,可以使用重心高度的系数和基节间的机械强度来评估植物的抗倒伏性和在高倒伏风险的田间收获的合适时间。

更新日期:2020-09-11
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