前言近年来,广东珠江三角洲沙围田蔗区的化学氮肥用量水平,随着甘蔗单产的增加而有很大的提高,并出现偏施重施化学氮肥求高产的倾向。科学理论和生产实践证明:在不讲究合理施肥技术的情况下,偏施化学氮肥越多,其损失就越大,甘蔗对氮肥的利用率也就越低;结果往往是增肥不增产,既大量浪费化肥,又增加生产成本,甚至还会降低甘蔗的工艺品质。因此,应用~(15)N示踪法来研究甘蔗在该类 Preface In recent years, the level of chemical nitrogen fertilizer in sugarcane field in Shahetian of Pearl River Delta in Guangdong Province has been greatly increased with the increase of yield per unit of sugarcane. Scientific theory and production practice have proved that without paying attention to the reasonable fertilization technology, the more partial chemical nitrogenous fertilizer is, the greater its loss is, and the lower the utilization rate of nitrogenous fertilizer is. The result is that increasing fertilizer does not increase production, A lot of waste of fertilizers, but also increase production costs, and even reduce the quality of sugar cane. Therefore, the application of ~ (15) N tracer method to study sugarcane in this category