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vol.29 issueUNICOEffect of different nitrogen fertilizers on the productivity of flooded rice author indexsubject indexarticles search
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LEITE, Norberto; GARGANTINI, Hermano; HUNGRIA, Luiz S.  and  IGUE, Toshio. Rice fertilization: study of the effect of nitrogen, phosphorus, micronutrients and lime. Bragantia [online]. 1970, vol.29, n.unico, pp.273-285. ISSN 0006-8705.

Thirtheen experiments were carried out at several places in the Paraíba Valey, São Paulo State, to study the effects of nitrogen, phosphorus and micronutrients fertilization, as well as of liming, on rice production. Nitrogen and phosphorus were applied at the levels of nihil, 40, and 80 kg/ha. Lime was applied at the levels of 5 and 3 t/ha in the organic and clayey soils, respectively. Seeds of the variety "Iguape-agulha" were utilized. Cultivation was under flooding system. Planting was done directly with the seeds. The results showed a great response of rice production to nitrogen fertilizer, wich was considerable even at higher dosis. Only in 6 out of the thirteen experiments, there was some response to phosphorus. No response to micronutrients or to liming could be noticed.

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