北疆棉田叶面积系数变化动态的初步研究

A Tentative Studied on Leaf Area Index Change \;Tread of Early Mature Upland Cotton

1996～ 1 998年对棉田叶面积系数变化动态的研究结果表明 :棉花苗期叶面积系数增长缓慢 ,初蕾期开始迅速增长 ,到盛花期达到最大值 ,盛铃期下降缓慢 ,吐絮期迅速减少。北疆高产田 (1 80 0～ 2 2 50kg·hm-2 )适宜叶面积系数为 :五叶期为 0 0 98,蕾期 0 2 68,开花期 2 32 1 ,花铃期 3 30 3 ,吐絮期 2 4 99,9月下旬为 0 71 7。主茎叶与叶枝叶面积系数发生高峰期接近 ,虹枝叶比主茎叶推迟 30d左右。品种、地膜膜面积宽度、密度、化学调控。

In 1966～1999,results of studing cotton field leaf area index change tread indicated that seeding stage of cotton leaf area index increases slowly,early bud season begins quickly increase,when peak flowering stage leaf area index reaches maximum,peak bolling stage comes down slowly,boll opening stage decreases rapidly, hige yield cotton in North Xinjiang (1 800～2 250 kg·hm -2 )suitable leaf area index is 3.0～3.5 main stalk leaf and leafy shoot leaf area index show near high peak stage,fruit branch leaf is postponed about 30 days in comparison with main stalk leaf.Variety,land film surface width,density,chimical regulatory inhibition,the interval of days between watering the first time and opening film has stronger regulatory inhibition effect on cotton field leaf area index.