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随着棉区生产条件的改善,农村生产责任制的建立,广大棉农为了追求棉花高产,棉田氮素化肥投入量显著加大,施肥次数明显增多。由于肥料报酬递减规律的作用,加之氮肥施用技术不当和用量过大,致使棉花迟熟减产,纤维品质下降,投资高,效益低,而低产棉田却因氮肥供应不足或施用不当,得不到应有的增产效益。因此,如何经济合理施用氮肥,充分发挥氮肥的经济效益,是当前亟待解决的问题之一。为此,协作组
With the improvement of production conditions in cotton area and the establishment of responsibility system for rural production, in order to pursue high yield of cotton, the majority of cotton farmers increased the input of nitrogen fertilizer in cotton fields and the number of fertilization increased obviously. Due to the law of diminishing returns of fertilizers and improper application of nitrogen fertilizers and overdoses, delayed cotton production decreases, fiber quality declines, high investment and low efficiency, while low yield cotton fields can not receive due to inadequate supply or improper application of nitrogen fertilizers Some increase production efficiency. Therefore, how to use nitrogen fertilizer economically and rationally and give full play to the economic benefits of nitrogen fertilizer is one of the most urgent problems to be solved. To this end, the collaboration group