研究甘蔗不同施氮期,是研究甘蔗合理施肥的一个重要方面。近几年来,联产到户责任制的落实,极大地调动了广大蔗农群众发展蔗糖生产的积极性。但有的农户为了追求单位面积产量,出现了偏施、重施和晚施化学氮肥的倾向,结果增肥不增产,增产不增收,增收不增糖,给工农业经济效益带来了不良后果。 Studying different nitrogen application period of sugarcane is an important aspect to study reasonable fertilization of sugarcane. In recent years, the implementation of the household responsibility system has greatly aroused the enthusiasm of the masses of sugar cane farmers in developing their sucrose production. However, some farmers tended to deviate, re-apply and apply chemical nitrogen fertilizers in order to pursue yield per unit area. As a result, they did not increase production of fertilizers, increased yields did not increase incomes, and increased yields did not increase the added value of sugar, thereby bringing adverse economic and social benefits to industry and agriculture .