缓释氮肥对水稻的增产效果及其氮素利用率  

Influence of Slow-release Nitrogen Fertilizers on Lowland Rice Yield and Nitrogen Use Efficiency

作　　者：李方敏[1] 艾天成[2] 周升波[2] 聂小菊[2] 刘芳[1] 

机构地区：[1]华南农业大学资源与环境学院,广东广州510642 [2]长江大学涝渍灾害与湿地农业省级重点实验室,湖北荆州434025

出　　处：《土壤通报》2004年第3期311-315,共5页Chinese Journal of Soil Science

基　　金：湖北省教育厅科研项目(2001G03001)

摘　　要：在潜育性粘壤质水稻土上研究了缓释性氮肥对水稻产量和氮肥利用率的影响。结果表明:4种供试缓释氮肥对水稻增产效果和吸氮量的顺序均为:IBDU>OM>U>GUS>CDU>CK;施肥后9d土壤中铵态氮含量最大,依次为:U>OM>IBDU>GUS>CDU>CK;在最大分蘖期前土壤硝态氮含量较多且相对稳定,至孕穗期急剧降低,抽穗至成熟期再度回升;相对于尿素,IBDU和OM能明显提高氮素利用率,分别比尿素的利用率增加了14.62%和8.57%。Four slow-release nitrogen fertilizers (SRFs) were tested to investigate their effect on lowland rice yield and N use efficiency using clay loam gley paddy soil. Results showed that response of both rice yield and N uptake to the 4 SRFs was in the order of isobutylidene diurea (IBDU ) > oxamide (OM) > urea (U) > guanylurea sulphate (GUS)> crotonylidene diurea (CDU) > CK. The maximum soil ammonium nitrogen content was observed on the 9^(th) day after fertilization(DAF). The soil ammonium concentration was in the order of U > OM > IBDU > GUS > CDU > CK. During tillering stage, soil nitrate content was stable high. Afterwards soil nitrate content decreased remarkably to the lowest level until heading stage. From heading to harvest, the nitrate content increased again.The IBDU and OM treatments were able to increase nitrogen use efficiency (NUE) significantly. The efficiency in the NUE of IBDU and OM increased by 14.62% and 8.57% respectively compared to the NUE of urea.

关 键 词：缓释氮肥 水稻 氮素利用率 产量 

分 类 号：S511[农业科学—作物学] S143.15