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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%。
The effect of controlled release nitrogen fertilizer on rice yield and nitrogen use efficiency was studied on gneissic loamy paddy soil. The results showed that the sequence of yield increasing and nitrogen uptake by four kinds of slow-release N fertilizers were: IBDU> OM> U> GUS> CDU> CK. The content of ammonium nitrogen in soil was the highest at the 9th day after fertilization, > OM> IBDU> GUS> CDU> CK. Before the maximum tillering stage, nitrate nitrogen content in soil was relatively high and stable, and decreased sharply at booting stage and rose again at heading stage to mature stage. Compared with urea, IBDU and OM increased significantly Nitrogen utilization rate, respectively, than urea utilization increased by 14.62% and 8.57%.