种植密度对贵州春玉米茎秆抗倒伏性能及籽粒产量的影响

郑迎霞, 陈杜, 魏鹏程, 卢平, 杨锦越, 罗上轲, 叶开梅, 宋碧

Effects of planting density on lodging resistance and grain yield of spring maize stalks in Guizhou province

ZHENG Ying-Xia, CHEN Du, WEI Peng-Cheng, LU Ping, YANG Jin-Yue, LUO Shang-Ke, YE Kai-Mei, SONG Bi

表8 茎秆形态、力学特性与倒伏率、产量之间的相关性分析

Table 8 Correlation analysis between stalk morphology, mechanical properties, lodging rate and yield

指标 Item 倒伏率 Lodging rate 穿刺强度 Rind penetration strength 抗折力 Bending strength 产量 Grain yield 空秆率Empty shot rate -0.34 -0.51** -0.29 -0.56** 株高Plant height 0.76** -0.14 -0.25 0.48* 穗位高 Ear height 0.88** -0.56** -0.32 0.77** 穗位系数Ear position coefficient 0.01 -0.51** -0.05 0.31 节间长Internode length 0.75** -0.39 -0.53** 0.59** 节间粗Internode stem thickness -0.54** 0.64** 0.88** -0.63** 节间干重Internode dry weight -0.34 0.82** 0.76** -0.63** 单位茎长干重Dry weight under length -0.60** 0.81** 0.83** -0.80** 节间横截面积Cross-sectional area -0.82** 0.49* 0.97** -0.52** 横截面扁率Cross section flatness -0.59** -0.08 0.47* -0.04 穿刺强度Rind penetration strength -0.55** — — -0.83** 抗折力Bending strength -0.41* 0.61** — -0.58**