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由于1995年属特殊年份,夏季雨水偏多,秋季光照不足,棉花伏前桃、伏桃比例比常年明显下降,秋桃、晚秋桃为构成产量的主要部分。我省大部分棉田贪青晚熟,生育期推迟半月左右。因此棉农多用乙烯利催熟。喷过乙烯利的棉田,棉铃铃期可缩短8—5天,提早拔秆7—10天,由于缩短了棉花铃期,因此棉种的种胚发育不健全,种子的生活力弱。即使种皮已经变黑,种壳变硬,种内的胚因先天不足不能正常生长,影响发芽。据试验,霜前自然成熟的棉种,发芽率一般在70％以上,而喷过乙烯利的棉种,发芽率低于30％。因此,凡喷过乙稀利的棉花不宜留做种使用。如果已留做种子的,不能和霜前留种棉混合,需做严格的发芽试验,以保证播种质量。
Since 1995 is a special year, the rainfall in summer is too much and the autumn light is insufficient. The proportion of cotton peach and peach declined obviously compared with that of perennial. Autumn peach and late autumn peach are the main components of yield. Most cotton fields in our province are greedy and late-maturing, and the growth period is delayed by about half a month. Therefore, farmers use ethephon more ripening. Spraying ethephon in cotton fields, boll boll period can be shortened 8-5 days, early stubble 7-10 days, due to shorten the boll period, cotton seed embryo development is not perfect, the seed of weak vitality. Even if the seed coat has become black, the seed coat hardens, the embryo within the species due to congenitally deficient normal growth, affecting germination. According to the test, the natural mature cotton before frost, the germination rate is generally above 70%, while spraying ethephon cotton, germination rate of less than 30%. Therefore, it is not advisable to use cotton that has been sprayed with Polyethylene. If you have left the seeds, can not be mixed with the remaining cotton before frost, need to do a rigorous germination test to ensure the quality of planting.