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棉花生长后期,根系对养分的吸收功能明显减退,这时进行叶面喷肥可防早衰、防病害、促早熟,增产增收。叶面喷肥的时间最好在上午9时以前或下午5时以后。 一、喷氮防早衰。在8月下旬至9月上旬,叶面补充氮素营养,可使棉叶保持绿色,光合作用增强,防止早衰,提高产量;若与植物生长促进剂802混用,效果更好。先配制4000倍的802溶液,再按每50公斤溶液加0.5公斤尿素混合。每亩每次喷混合液75公斤左右,5—10天1次,连喷2—3次。 二、喷钾防病害。棉花缺钾,在开花结铃期易发生红叶茎枯病,发病后叶片呈黄、红色,易脱落,株型变矮小,早衰减产。在遇干旱的情况下,这种病害更为严重。在防止干旱的同时,叶面喷施钾肥液,可预防病害的发生,减轻损失。7天一次,连喷2—3次。 三、喷磷促早熟。8月下旬,叶面喷磷,可使种
Late cotton growth, nutrient absorption of root function decreased significantly, then foliar spray can prevent premature aging, disease prevention, early maturity, increase yield. Foliar spraying the best time before 9:00 or after 5:00 pm. First, anti-premature anti-inflammatory nitrogen. In late August to early September, foliar nitrogen nutrition, cotton leaves can be kept green, photosynthesis increased to prevent premature aging and increase production; if the plant growth promoter 802 mixed with better. 4000 times the first preparation of the 802 solution, then press every 50 kg solution plus 0.5 kg of urea mixed. Spray mixed liquid per acre about 75 kg, 5-10 days 1, and even spray 2-3 times. Second, spray potassium disease prevention. Cotton potassium deficiency, blossoming in the blossoming prone to blight stem blight, the leaves were yellow, red, easy to fall off, plant type becomes dwarf, premature declines. In the case of drought, the disease is even worse. In the prevention of drought at the same time, the foliar application of potassium fertilizer can prevent the occurrence of diseases and reduce losses. 7 days time, even spray 2-3 times. Third, spray early to promote phosphorus. In late August, foliar phosphorus, can make the species