盛花期调节群体底层透光率对棉花产量的影响

Effeets of modulating light transmission ratio of population bottom at full-bloom stage on the cotton yield

在生育稳健、盛花期叶面积指数偏大的棉田 ,以整枝为手段 ,把群体底层透光率调节到 2 2 3%、5 18%和 8 90 % 3个水平。测产表明 ,透光率为 5 18%的处理的成铃率和子棉产量都极显著高于透光率过低和过高的处理 ,其中透光率为 8 90 %的处理子棉产量最低 ,比透光率为 2 2

Light transmission ratio of the population bottom was modulated to three different level with the method of pruning in the normal development and bigger leaves area index field.The yield test showed that boll setting ratio and seedcotton yield of the treatment with 5 18% light transmission ratio were higher at very significant level than the other treatments.In the study the seedcotton yield of the treatment with 8 9% light transmission ratio was lowest and its yield loss reached to significant level compared with the treatment with 2 23% light transmission ratio.