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二、棉花蕾、铃发育所需的积温棉花蕾、铃期的长短,除与棉种、品种有关外,与温度关系最为密切。过去大量研究证明,一般蕾、铃期随气温的升高而缩短。我院1974年定株观察结果,棉株一个蕾的充分发育(即从现蕾到开花)所需的活动积温为700℃左右,有效积温为400℃左右。但6月中旬到7月上旬不同时期现的蕾,其蕾期长短所需的积温差别不大,其传况见表4。
Second, cotton buds, bell development required temperature cotton buds, the length of the bell, except with cotton varieties, varieties, and the temperature most closely. In the past a large number of studies have shown that the general bud, bell-shaped shortening with the temperature rise. In our hospital in 1974, the results of observation of plants, cotton bud full development (that is, from budding to flowering) required activity accumulated temperature of about 700 ℃, the effective accumulated temperature of about 400 ℃. However, the buds present in different periods from the middle of June to the first ten days of July have little difference in accumulated temperature required for their budding duration. See Table 4 for their transmission.