Abstract— Rice genotypes were grown under different water regimes and nitrogen levels. Sufficient soil moisture content (SMC) and high N level caused optimum growth of the genotypes. Deficient water and N supply both retarded growth of rice. PSB Rc14, P42, and P38 had high number of tillers, number panicles per hill, number of spikelets per panicle, relative growth rate (RGR), water use efficiency (WUE), harvest index (HI), straw yield, grain weight, and grain yield at field capacity (FC). These genotypes also had high values in the aforementioned growth and yield parameters at 120 kg N ha-1 treatment. In terms of the efficiency in the use of N as indicated by agronomic efficiency of nitrogen application (AEN), recovery efficiency of nitrogen application (REN), and internal efficiency of nitrogen application, PSB Rc14, P42, and P38 still performed better than the rest of the genotypes tested. Evaluation of the combined effect of water and N application showed that PSB Rc14, P42, and P38 significantly produced high grain yields among the genotypes under SMC at FC with 120 kg N ha-1 which suggests that water plays a fundamental role in rice growth in combination with N. P42 showed the less affected by water deficit and low N nitrogen levels, hence, produced the high grain yield.
Keywords— Upland rice, nitrogen use efficiency, agronomic use efficiency, recovery use efficiency, rice genotypes.
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