Nitrogen doses in rice grown in a tropical lowland

Authors

  • Marilia Barcelos Souza Lopes Mestranda em Produção Vegetal Universidade Federal do Tocantins Campus Universitário de Gurupi
  • Taynar Coelho de Oliveira Doutoranda em Produção Vegetal Universidade Federal do Tocantins Campus Universitário de Gurupi
  • Danilo Pereira Ramos Estudante de Agronomia Universidade Federal do Tocantins Campus Universitário de Gurupi
  • Leila Paula Tonello Mestranda em Produção Vegetal Universidade Federal do Tocantins Campus Universitário de Gurupi
  • Cassia Mara dos Santos Alexandrino Estudante de Agronomia Universidade Federal do Tocantins Campus Universitário de Gurupi
  • Rodrigo Ribeiro Fidelis Professor Associado Universidade Federal do Tocantins Campus Universitário de Gurupi

DOI:

https://doi.org/10.14295/cs.v6i4.984

Keywords:

Oryza sativa L., nitrogen, dose, grain yield

Abstract

The rice plant is characterized by having high nutrient demand, being nitrogen (N) the main limiting factor to its productivity. The objective of this study was to evaluate the response of two rice cultivars according to doses of nitrogen fertilization. The experiment was carried out in an irrigated lowland area with hydromorphic soil (humic gleysol) at the region of Formoso do Araguaia-TO, Brazil. The experiment design consisted of five N doses (30, 60, 90, 120 and 150 kg ha -1) applied as urea, and two rice cultivars (Irga-424 and Irga-423). Each experimental plot consisted of twenty-seven lines with 15 m in length, spaced 0.17 m between rows. The useful plot size was made up of four central lines with two linear meters of length. The evaluated characteristics were plant height, number of panicles per m2 , grain yield in kg ha -1, hundred grain mass in g, nitrogen content in dag kg-1, and total chlorophyll index in CFI. Data were submitted to variance analysis and regression at 5% probability by F test. The maximum yield was obtained at a dose of 96 and 126.38 kg N ha -1 for Irga- 424 and Irga-423, respectively. The highest grain yield was 7800 and 5860 kg ha -1 for Irga-424 and Irga-423, respectively.

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Published

2015-12-29

How to Cite

Lopes, M. B. S., Oliveira, T. C. de, Ramos, D. P., Tonello, L. P., Alexandrino, C. M. dos S., & Fidelis, R. R. (2015). Nitrogen doses in rice grown in a tropical lowland. Comunicata Scientiae, 6(4), 404–411. https://doi.org/10.14295/cs.v6i4.984

Issue

Vol. 6 No. 4 (2015)

Section

Original Article

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