Abstract: In order to clarify the characteristics of corn stalk differences in the Hilly Region of Sichuan Province and the ability of lodging and yield,screening maize variety with lodging resistance and summer sowing resistant. In this experiment,ten maize varieties with larger area in Sichuan Province were used as the materials in spring and summer sowing dates. And compared the stalk morphological characteristics,mechanical strength,lodging resistance of basal internodes and consist of yield in 7-days after silking. The results showed that the lodging was easier in summer. There were significant difference in morphological characteristic,mechanical strength of basal internode and grain yield of different varieties,all affected by sowing date.Compared with spring sowing,summer maize plant and ear height become higher,basal internode length decreased thinner,crushing strength and breaking strength weakened, lodging resistance and yield also decreased,but there was a big difference in the magnitude of this variation between varieties. CD30 was a good summer sowing varieties,lodging resistant ability was strong,high yield of summer sowing; However,ZH505 resistant ability was relatively weak,but high yield and strong lodging resistance of spring maize could be used as a variety of planting.

Key words: Sowing in spring, Sowing in summer, Maize, Lodging resistant, Mechanical properties

CLC Number: 

• S513.01