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在中亚細亚灌溉棉田的条件下,氮肥的有效性主要决定于施入土壤中的时期。全苏棉作科学研究所阿克·卡瓦克試驗場棉花生长試驗指出:貯藏在棉籽內的氮素营养物質只能保証供应幼苗10-15天的需要。棉花开始生长到孕蕾期,从土壤中消耗的氮量,約佔其全部生长期中总消耗量的5-10%。烏茲別克
Under the condition of cotton fields in Central Asia being irrigated, the effectiveness of nitrogen fertilizers mainly depends on the period of application into the soil. All cotton for the Institute of Science and Technology Akekawake test site cotton growth test points out: Nitrogen stored in cottonseed nutrients can only guarantee the supply of seedlings 10-15 days of needs. Cotton begins to grow into the bud period of pregnancy, and the amount of nitrogen consumed from the soil accounts for about 5-10% of the total consumption during its entire growing period. Uzbekistan