The objective of this study was to determine adequate N level for modern upland rice (Oryza sativa L.) cultivars sown at 0.20 m row spacing under supplemental sprinkler irrigation. The effects of N levels (0, 40, 80, 120, and 160 kg of N/ha) on the yield of one cultivar (Maravilha) and three favourable upland rice lines (CNA7127, CNA7730, and CT7/15) were studied during three crop seasons, in Santo Antônio de Goiás, GO, Brazil, in a Dark Red Latosol. According to regression model used, the maximum rice grain yield was 5,523 kg/ha, obtained with 112.9 kg of N/ha. Considering the prices of N (R$1.20) and rice (R$ 0.20) practiced in Goiânia, on June/97, the economical N level was 87.3 kg/ha.
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Stone, L. F., Da Silveira, P. M., Moreira, J. A. A., & Yokoyama, L. P. (1999). Adubaçâo nitrogenada em arroz sob irrigação suplementar por aspersão. Pesquisa Agropecuaria Brasileira, 34(6), 927–932. https://doi.org/10.1590/s0100-204x1999000600002