【摘要】 棉花柱头外露种质从出苗到现蕾的基本营养生长期的长短因不同类型品系而异 ,变幅为 16～ 30d。根据这个最大日差距可将棉花营养生长期分短、中、长 3类。当平均温度在 2 9.5～ 30℃ ,昼夜温差为 33.7～34.8℃ / 2 5 .4～ 2 6 .1℃ ,日照 9.0～ 13 .80h日 ,供试材料的基本营养生长期 ,以Ys9、Ys3、Ys6和泗棉 3号最短为 16～ 17d。此外 ,还可从第一果枝着生节位高低和现蕾时的单株叶面积大小得到验证。更多还原

【Abstract】 The basic vegetative periods of different types of cotton germplasm with stigma showing from seedling emergence till budding varied from 16 to 30 days. According to the Maximum difference of the basic vegetative periods, the cultivars of stigma showing were divided into short, middle and long types. Under the conditions of mean daily temperature of 29.5℃～30℃, the daylength of 9.0～13.80 hours and the temperature difference of 33.7℃～34.8℃/25.4℃～26.1℃ between day and night, the basic vegetative periods of Ys 9, Ys 3, Ys 6 and Simian 3 were the shortest -16～17 days. Furthermore, the classification of cotton germplasm with stigma showing can be verified by the height of the first fruiting branch node and the size of per plant leaf area.更多还原