摘要
试验在黄淮地区棉麦两熟不同配置方式的棉田进行。测定表明,7月底封行期叶面积系数(F 或 LAI)为2.16～4.40,日光强和层次光强不同配置方式之间存在较大差异。中低产与高产田的六二和三一式(常规密度)群体消光系数(K)值大且不稳定,宽行过宽群体光浪费严重;四二式和高密度的群体 K 值小且稳定,光能分布合理。研究指出,两熟配置宜适当缩短行距以增加群体密度。7月底封行期最适 F 为3.5～4.0,实现这一指标,育苗移栽宜选用四二式配置方式,标准带幅宽150cm;采用密植密管促早栽培,每公顷密度75000株较为合适。
This study aims to describe cotton population structure and light distribution law in cotton-wheat intercrop under different planting patterns in Huanghuai district.It showed that during the canopy closed period in late July,the leaf area index(LAI or F)was 2.16～4.40.There are singnificant differences among different planting patterns in daily light intensity and light intensity in stem layers.The light absorbing coefficient(K)of general planting density with the pattern of wheat:cotton rows of 6:2 and 3:1 on the soil of sligh- nly low productivity and high productivity were large and unstable.An over wide row space could make cotton plants squander light energy heavily.The general planting density with the pattern of wheat:cotton rows of 4:2 and high planting density have small and stable K val- ue,which made light evenly distributed.Rows space for double crop planting should be pro- perly decreased in order to increase population density.It suggested that the optimal LAI value is 3.5～4.0 during the canopy closed period thus a measure of transplanting young plants and the planting pattern of 4 wheat:2 cotton with row space 150cm wide should be taken,at the same time,special cultural measures of high planting density and careful management with 75000 plants per hectare should be also conducted.
出处
《棉花学报》
CSCD
北大核心
1993年第1期65-72,共8页
Cotton Science
关键词
棉花
配置方式
群体结构
光能分布
cotton
planting pattern
population structure
light distribution
