目前,我市水稻生产中氮肥用量居高不下,氮肥当季利用率较低,既造成肥料大量流失,污染环境,又增加农本,影响稻米品质,导致土壤理化性状恶化,土壤持续生产能力低下。为能有效降低氮肥施用量,提高肥料当季利用率,优化肥料投入结构,达到农业增效、农民增收,笔者于2005年在常规粳稻 At present, the amount of nitrogen fertilizer used in rice production in our city is high, and the utilization rate of nitrogen fertilizer in the season is low, which not only causes a great loss of fertilizers, pollutes the environment, but also increases the cost of rice and thus affects the quality of rice, resulting in deterioration of soil physical and chemical properties and continuous production of soil . In order to effectively reduce the amount of nitrogen fertilizer, improve the utilization of fertilizer season, optimize the structure of fertilizer inputs to achieve agricultural efficiency, farmers income, the author in 2005 in conventional japonica rice