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以耐密性不同玉米品种为材料,调查吐丝期暴雨大风后玉米倒伏情况,分析增密过程中不同夏玉米群体植株形态与茎秆力学变化规律。结果表明,随密度增加,大风后根倒率和茎折率显著增加,登海618的根倒率和茎折率显著低于浚单20。随着密度增加,玉米株高和穗位高增加,基部3~7节间均表现为节间伸长、变细,茎粗系数、穿刺强度、抗折力、压碎强度显著降低,两个品种表现一致。相关分析表明,根倒率和茎折率与节间长度、株高、穗位高和穗位系数正相关,与茎粗、茎粗系数和茎秆力学负相关。站秆率与倒伏率均与基部第3节间性状的相关性达显著水平。与浚单20相比,登海618具有较低的节间长度、株高、穗位高、穗位系数和较高的茎粗、茎粗系数和茎秆力学,抗倒性能较强。
With different density of maize varieties as material, the investigation of maize lodging after torrential wind gusts during silking stage was carried out. The changes of plant morphology and stem mechanics of different summer maize populations during densification were analyzed. The results showed that with the increase of density, the root and stem percentages of gynophores increased significantly, and the root and stem percentages of Denghai 618 were significantly lower than those of Xundan 20. With the increase of density, the plant height and ear height of maize increased. The internode elongation, thinning, stem diameter coefficient, puncture strength, The performance of the same species. Correlation analysis showed that root turnover rate and stem rate were positively correlated with internode length, plant height, ear height and ear position coefficient, but negatively correlated with stem diameter, stem diameter coefficient and stem mechanics. Stalk rate and lodging rate both had a significant correlation with the third inter-node trait in the base. Compared with Xundan 20, Denghai 618 had lower internode length, higher plant height, higher ear height, higher ear diameter and higher stem diameter, stem diameter and stem mechanics, and better lodging resistance.