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奉贤县棉花产量1980、1981、1982连续三年徘徊在百斤左右,这除不利的气候因素外,在栽培上用肥量大(平均亩施纯氮25～27斤)特别是前期施用氮肥过多(平均亩施纯氮10～11斤),导致棉花徒长是个重要原因。联系蕾铃脱落的生理机制,我们认识到控制棉株前期营养生长,保证棉田一定的光照条件和防止后期早衰是棉花稳产高产的关键,实质上这是个科学施肥的问题。1982年县农业技术推广站提出在棉花前期生长阶段轻施苗肥,少施或不施蕾肥的技术意见,结果几做得好的一些生产队的棉花产量都在140斤
Fengxian County, cotton production 1980,1981,1982 hovering for about three consecutive years in about hundred pounds, which in addition to unfavorable weather factors, the use of large amounts of fertilizer on cultivation (average 25-25 kg of nitrogen per acre) especially the early application of nitrogen fertilizer over More (an average of 10 to 11 pounds of pure nitrogen Mushi), leading to petty cotton is an important reason. Contact with the physiological mechanism of the fall of the bell, we recognize that the control of cotton plant vegetative growth in the early stage, to ensure that certain cotton fields of light conditions and prevent premature aging is the key to stable and high yield of cotton, in essence, this is a scientific fertilization. In 1982, the county agricultural extension station put forward the technical suggestion of lightly applying the seedling fertilizer, applying or not applying the lean fertilizer in the pre-cotton growth stage. As a result, some production teams that did a good job of producing cotton produced 140 kg