多熟制地区带距与套作玉米生长、产量分析

Effect of strip distance on interplanting corn growth and yield in multi-harvest regions

1996～1998年不同带距与玉米产量、群体动态指标结果分析表明:4m带距是丘陵区套作春夏玉米的高产稳产带距,夏季套栽玉米4m比中带增产9 7%,比窄带平均增产12 0%,春季套栽玉米4m比1 67m增产5 9%,迟春套栽玉米4m比1 67m减产9 99%;并建立了带距与产量的回归方程。4m带距在发挥边行优势基础上,有利于春季套栽玉米建立中行优势,迟春、夏季套栽玉米中行劣势的显著下降;促进玉米苗期叶面积指数的提高,喇叭口期叶日积达高值期,穗叶供长期(七叶展)干物质积累增长,穗五叶的生长,吐丝前形成壮苗健株,吐丝后光合势占总光合势的百分率和生物产量显著增加。

In 1996-1998,the multilocation trials were carried out to study the effects of differen strip distance on corn growth and population dynamic index.The results showed that the springsummer interplanting corn yield of 4m strip was the highest and most stable in hilly regions.Compared with that of middle strip and narrow strip,the summer interplanting corn yield of 4m strip increased by 9.4% and 12.0%,respectively,and compared with that of 1.67m,the yield of spring interplanting corn increased by 5.9%,and that of latespring interplanting corn of 4?m strip decreased by 9.99%.A regression equation of the strip distance and corn yield was established.It showed 4m strip was benefit to the middle superiority of spring interplanting corn,based on full use of side superiority,and the middle inferiority of summer interplanting corn significantly dropped.The results showed LAI·T reached peak value,and the accumulation of dry matter increased significantly at the ear and leaf growth stage.