棉花群体冠层结构与干物质生产及产量的关系

The relationship of cotton canopy structure, photosynthetic characters, dry matter accumulation and distribution and yield

对晋棉１０号品种９．０万～１５万株·ｈｍ－２５个群体密度梯度下的冠层结构、光合特性及其与干物质生产和分配的关系进行了研究。结果表明：在山西特早熟棉区适期播种条件下，晋棉１０号品种最适群体为１０．５万株·ｈｍ－２。该群体下，棉花冠层结构、光合特性及干物质生产与分配均优于其他群体，经济产量高出其他群体平均产量２５％以上。同时，提出了晋棉１０号品种适宜群体的若干指标。

The relationship of cotton canopy structure, photosynthetic characters, dry matter accumulation and distribution and yield of variety Jin 10 under the population density rank from 90,000 to 150,000 plants per hectare were studied. The results showed that the optimum population density of the variety is 105,000 plants ha in the situation of earlier harvest area of Shanxi. Under the optimum density, cotton canopy structure, photosynthetic characters and dry matter accumulation and distribution are better that other densities of the community. Specially, the yield of optimum community is higher than other's by 25%. The study also gives some index of Jin 10's optimum community, this is beneficial for the harvest of cotton and new cotton variety breeding.