Polymer-coated urea (PCU) is an important alternative to uncoated urea for improving nitrogen (N) use efficiency (NUE). Only a few studies discuss their utility for lowland rice systems. A 2-year field study was conducted to examine if nitrogen loading is reduced in lowland rice ecosystem by using mixture of PCU and uncoated urea without sacrificing yield. Five treatments involving two mixtures of PCU with 50 and 70% coated urea each at 70 and 50% of recommended dose (80 kg N ha -1 ) and one with uncoated urea at 100% recommended dose were laid out in a completely randomized design. Selected plant growth parameters and plant available N contents (NH 4 -N plus NO 3 -N) in soil solution and ponded water were measured over a period of 65 days after transplanting.
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