不同施肥方法对缓释尿素的肥效及氮素利用率的影响

以水稻和玉米为供试作物进行盆栽试验和田间试验。结果表明,水稻和玉米的增产效应均表现为;缓释尿素基追施结合处理>普通尿素基追施结合处理>缓释尿素一次性基施处理>普通尿素一次性基施处理。处理间差异达显著或极显著水准。相比之下,一次性基施改为基追施结合的增产幅度要优于尿素缓效化的肥效。两种作物对尿素的氮素利用率范围值分别为54.8%~70.1%(水稻)和53.6%~59.1%(玉米),其规律与上述肥效相吻合,也是各处理增产的内在原因。在水稻和玉米生产中应推荐在施用PK肥基础上,缓释尿素85%作基肥、15%作追肥这一施肥方法。

Application Methods Influence on the Nitrogen Utilization Efficiency of Controlled Release Urea

Pot and field experiments were conducted by planting rice and maize to investigate the effect of(controlled-release-urea) on the use efficiency and crop yield.The results showed that the controlled release urea applied as basal and treated in late stages was the best,but the urea applied as only basal was the worst.The difference was significant between different treatrnents.The nitrogen utilization efficiency was 54.8-70.1%(rice) and 53.6-59.1%(maize).Our recommendation is that on the base of P and K fertilizers,85% of N should be used as basal and 15% can be applied in later stage if necessary.