The effects of the different models of water and fertilizer management on grain filling characteristics and nitrogen utilization of spring maize in Hilly Regions of Mount Yanshan in Inner Mongolia were studied.The Jingdan 128 as the maize variety and four patterns of water and fertilizer management:no nitrogen(N0),nitrogen with flooding according to the local practice (CK),application rate with drip irrigation under mulch according to the local practice (DI),nitrogen with the model of drip irrigation and fertilization under mulch(WF)we used.The results of successive two years experiment showed:the management of fertigation performed best in grain filling characteristics.It could extend filling stage about 4.4 days compared with CK and improved filling rate effectively with 19.5% compared with CK.Meanwhile,the grain yield had a significantly positive correlation with grain filling rate and filling time.As for nitrogen utilization, the order of (nitrogen use efficiency,partial factor productivity,agronomic efficiency and nitrogen physiological utilization) performance in treatments (WF,DI and CK) was:WF>DI>CK.The nitrogen use efficiency of WF reached 60.8% and increased 33.4 percentage points compared with CK.The yield order was WF>DI>CK>N0 and,WF increased 47.1% compared with CK.Comprehensive analysis,drip irrigation fertigation nitrogen (WF) model is suitable for application and promotion in the region.%为研究内蒙古燕山丘陵区不同水肥管理条件对春玉米籽粒灌浆特性、氮素利用和产量的影响.以京单128为供试品种,采用不施氮(N0)、农民常规施氮+漫灌(CK)、农民常规施氮+膜下滴灌(DI)、膜下滴灌水肥一体化施氮(WF) 4种水肥管理方式,并对其进行了对比研究.连续2年试验结果表明,在籽粒灌浆特性方面,WF处理表现最优,能有效延长灌浆期、提高灌浆速率,持续灌浆期较对照平均延长4.4 d,平均灌浆速率提高19.5%,且灌浆速率、灌浆时间均与籽粒产量呈显著正相关;在氮素利用方面,氮肥利用率、氮肥偏生产力、氮肥农学效率以及氮肥生理利用率均以WF处理最高、DI处理次之、CK处理最低,其中WF处理氮肥利用率最高达到了60.8%,平均值较对照处理(CK)提高了33.4个百分点;在产量方面,各处理表现为:WF>DI>CK>N0,WF处理较对照平均增产47.1%.综合分析,膜下滴灌水肥一体化施氮(WF)模式较适宜在该地区应用推广.
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