行向和种植方式对玉米穗下节间与茎倒伏相关性状的影响

Effects of Row Orientation and Planting Pattern on Traits Associated with Stem Lodging in Maize

行向和种植方式是调节玉米冠层结构的重要措施。但行向和种植方式是否影响基部茎节的抗倒伏相关性状还不清楚。本研究在吉林省玉米种植区进行,采用均匀垄(行距为65 cm)和宽窄行(宽行距为80 cm,两窄行距为40 cm)的种植方式,行向分别为东西向、南北向和南偏西20°,探讨行向和种植方式对倒伏相关的玉米基部节间性状的影响。研究结果显示,宽窄行种植的玉米的穗高系数低于均匀垄。行向影响玉米基部第二茎节的横向压碎强度、第二、第四和第六茎节的含水量以及第四茎节的茎粗系数。行向和种植方式互作对第二和第六茎节的横向压碎强度、第四茎节的单位长度鲜质量、鲜密度以及茎粗系数的影响显著。因此选择宽窄行种植方式和适宜的行向可以提高玉米基部茎节倒伏抗性。

Stem traits of maize decided stem lodging resistance. Whether the row orientation and planting pattern affects the stern strains associated with stem lodging was not clear. The experiment with planting pattern of wide - narrow row （80 cm ＋ 40 cm） and u- niform row （65 cm, CK） in North- South （NS） , East- West （EW） and South by West 20 degree （SW） orientation was conducted in field. Stem traits associated with stem lodging were measured. The results showed that cob position height coefficient under wide - narrow row was significantly decreased. Row orientation influenced stalk crushing strength at the second internode, water content at the second, fourth and sixth internodes and stem diameter coefficient at the fourth internode. The interaction between row orientation and planting pattern affected stalk crushing strength at the second and sixth internodes, fresh weight/length, and stem diameter coefficient at the fourth internode. Therefore, suitable row orientation and planting pattern could affect some stem traits associated with stem lodg- ing in Dehui City, Jilin province corn planting area.