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以抗倒伏性能不同的玉米品种为试验材料,研究密度对其农艺性状及茎秆抗倒伏性能的影响。结果表明,随着密度的增加,基部向上各节长和节粗变化不规律。节干重、单位茎长干重和茎秆抗折力均随着密度的增加先增加后降低,其中,单位茎长干物质重均在密度7万株/hm时最大,各节干重和茎秆抗折力最大值出现时间因品种和节位而不同。相关分析结果表明,玉米倒伏率与第3、第4节所有指标均呈显著相关,与第5、第6节间单位茎长干物质重、节干重和茎秆抗折力均呈显著正相关,与株高、穗位高和穗位高系数的相关性因品种而异。
Maize varieties with different lodging resistance were used as experimental materials to study the effect of density on their agronomic characters and stem lodging resistance. The results show that with the increase of density, the upwards and upwards knuckles of the base change irregularly. The dry weight of stem, the dry weight of stem and the bending strength of stem increased first and then decreased with the increase of density. The dry weight of long stem of each unit was the largest at the density of 70 000 plants / hm, The onset time of the maximum value of the ultimate stress of stems varies with the variety and node. The results of correlation analysis showed that the lodging rate of maize was significantly correlated with all the indexes in Section 3 and Section 4, and was significantly positively correlated with the dry matter weight, dry weight, and stalk bending resistance of the fifth and sixth internodes The correlation with plant height, ear height and ear height coefficient varies by species.