DOI: 10.11648/j.ajpb.20261103.20 ISSN: 2578-8337

Nitrogen and Phosphorus Fertilizer Rates Influence on Growth and Yield of NERICA 4 Rice Variety in Upland Conditions at JICA Tsukuba Center Japan

Sisay Gurmu, Ahave Alfredo, Massaquoi Muctaru, Hisashi Urayama, Goichi Sasaki
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The level of fertilizer application is among the factors prioritized for rice production constraints in Ethiopia, Sierra Leone, and Angola. Therefore, a field experiment was conducted to determine the influence of Nitrogen and Phosphorous fertilizer on growth, yield and yield components of NERICA 4 rice variety under upland condition at Tsukuba International Center, Japan during 2025 cropping season. The experiment involved factorial combinations of three rates of Nitrogen (0, 60 and 120 kg N ha -1 ) and three rates of Phosphorous (0, 50 and 100 kg P 2 O 5 ha -1 ) laid out in 3×3 factorial arrangements in RCBD with three replications. Growth and yield of rice were significantly affected by nitrogen levels and the treatment difference, but not by phosphorus fertilizer levels. Due to the sufficient phosphorus in the experimental field, the application of high phosphorus did not have a significant effect. The significant highest grain yield (3.49 t ha -1 ), number of panicles per m 2 (281.7), N uptake (103.8 kg ha -1 ) and P uptake (21.8 kg ha -1 ) were obtained from application of 120 kg N ha -1 . Applying 60 kg N ha -1 and no phosphorus application produced the highest agronomic efficiency and statistically equivalent to the highest application of nitrogen (120 kg N ha -1 ) and phosphorus (100 kg P 2 O 5 ha -1 ), making it an economical treatment. However, this one season and one location study must be reconfirmed in different seasons and over locations to make a sound conclusion.

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