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近年来,我地使用的氮素化肥主要是尿素和碳酸氢铵,而人们又习惯于用尿素做棉花种肥 但往往因用量过多,造成尿素烧种死苗,影响全苗,结果是早播没有早苗,迟播不能全苗,全苗不能壮苗。为了找出棉花用尿素做种肥的适宜用量,1986年我们进行了初步的试验和观察。试验在冲积泥土和砂土两种土壤中进行,供试品种为鄂荆92.试验设10个处理,模拟每亩施尿素0,1.5、3、4.5、6、7.5、10.5、13.5、16.5、20公斤,播种时开
In recent years, the nitrogenous fertilizers that I use mainly are urea and ammonium bicarbonate, and people are accustomed to use urea as fertilizer for cotton, but they often burn their seedlings due to the excessive use of urea, affecting the whole seedlings. The result is early Sow no seedlings, delayed seedlings can not be delayed, the whole seedlings can not strong seedlings. In order to find out the appropriate amount of urea fertilizer for cotton, in 1986 we conducted a preliminary test and observation. The experiment was carried out in alluvial soil and sand soil, and the test variety was Jing Jing 92. The experiment set 10 treatments, simulating urea application at 0,1.5,3,4.5,6,7.5,10.5,13.5,16.5, 20 kg, sowing time