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在棉花生长后期,是营养生长和生殖生长并进,协调发展时期,也是营养最大效率时期。对养分的需长量增大,而根系吸收功能却明显减退,此时进行叶面根外追肥有明显增产作用。 一、喷氮肥防早衰:在8月下旬至9月上旬,用10—20％尿素溶液喷洒棉株,每亩喷40—50kg,每隔5—7天喷一次。连喷2—3次,能使棉叶保持绿色,增强光合作用.防止早衰,提高单产。 二、喷磷肥促早熟:从8月下旬开始,用过磷酸钙1kg加水50kg,溶解后取其过滤液,亩喷100kg左右,每7天喷一次,连喷2—3次,可促进种子饱满,增加铃重,提早吐絮,还能提高根系吸收能力,有利于抗旱,防早衰促早熟。
In the later stages of cotton growth, vegetative and reproductive growth go hand in hand, the period of coordinated development, but also the period of maximum efficiency of nutrition. The need for nutrients in large quantities increased, while the root absorption function was significantly reduced, then foliar fertilizer topdressing significantly increased yield. First, anti-premature senility nitrogen spray: In late August to early September, spray cotton plants with 10-20% urea solution, spraying 40-50kg per mu, spray every 5-7 days. Even spray 2-3 times, make cotton leaves green, enhance photosynthesis. Prevent premature aging and improve yield. Second, the early phosphatic fertilizer to promote early maturing: from the beginning of late August, with superphosphate 1kg water 50kg, dissolved after taking the filtrate, acres spray about 100kg, spray once every 7 days, and even spray 2-3 times, can promote full seed , Increase the boll weight, prematurely flocculent, but also improve the root absorption capacity, is conducive to drought, prevent premature aging and failure.