Agricultural answers and chemical composition of Massai grass under different nitrogen doses and urea sources

Authors

  • Aline Barros da Silva Universidade Federal Rural do Rio de Janeiro
  • Carlos Augusto Brandão de Carvalho Universidade Federal Rural do Rio de Janeiro
  • Danilo Antonio Morenz Universidade Federal Rural do Rio de Janeiro
  • Pedro Henrique Ferreira da Silva Universidade Federal Rural de Pernambuco
  • Alex Junio dos Santos Universidade Federal Rural do Rio de Janeiro
  • Fábio Costa dos Santos Universidade Federal Rural do Rio de Janeiro

DOI:

https://doi.org/10.5433/1679-0359.2018v39n3p1225

Keywords:

Coated urea, Nitrogen fertilization, Panicum maximum, Seasons of the year.

Abstract

Under the hypothesis that modifying nitrogen sources and doses could increase nitrogen fertilization efficiency and productivity and improve forage quality, this study aimed to evaluate the morphological composition, structural characteristics and chemical composition of Panicum maximum cv. Massai forage cultivated under different urea sources (common and coated with Policote®) and nitrogen doses (200, 400 and 600 kg ha-1 year-1) during the autumn, winter and spring of 2014 and the summer and autumn of 2015. The experiment was carried out in Seropédica, RJ, under a randomized complete block design in a factorial arrangement (3x2) + 1 with four replications. High nitrogen rates promoted higher percentages of leaf blade dry mass and lower percentages of dead material dry mass in the forage mass and provided higher tiller population density and forage accumulation rate of Massai grass during the studied seasons. The use of coated urea promoted higher levels of crude protein in the forage than did the use of common urea in all seasons. The intensification of nitrogen fertilization reduced the nitrogen use efficiency but benefitted the structural characteristics, forage accumulation and chemical composition of Massai grass forage. The use of coated urea promoted greater of nitrogen use efficiency during all seasons of the year.

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Author Biographies

Aline Barros da Silva, Universidade Federal Rural do Rio de Janeiro

Parte da Dissertação de Mestrado do primeiro autor. Discente, Curso de Doutorado do Programa de Pós-Graduação em Zootecnia, Universidade Federal Rural do Rio de Janeiro, UFRRJ, Seropédica, RJ, Brasil.

Carlos Augusto Brandão de Carvalho, Universidade Federal Rural do Rio de Janeiro

Prof. Dr., Departamento de Nutrição Animal e Pastagem, UFRRJ, Seropédica, RJ, Brasil.

Danilo Antonio Morenz, Universidade Federal Rural do Rio de Janeiro

Dr. em Zootecnia, Instituto de Zootecnia, UFRRJ, Seropédica, RJ, Brasil.

Pedro Henrique Ferreira da Silva, Universidade Federal Rural de Pernambuco

Discente, Curso de Doutorado do Programa de Doutorado Integrado em Zootecnia, Universidade Federal Rural de Pernambuco, UFRPE, Recife, PE, Brasil.

Alex Junio dos Santos, Universidade Federal Rural do Rio de Janeiro

Discente, Curso de Graduação em Zootecnia, UFRRJ, Seropédica, RJ, Brasil.

Fábio Costa dos Santos, Universidade Federal Rural do Rio de Janeiro

Discente, Curso de Graduação em Zootecnia, UFRRJ, Seropédica, RJ, Brasil.

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Published

2018-05-04

How to Cite

Silva, A. B. da, Carvalho, C. A. B. de, Morenz, D. A., Silva, P. H. F. da, Santos, A. J. dos, & Santos, F. C. dos. (2018). Agricultural answers and chemical composition of Massai grass under different nitrogen doses and urea sources. Semina: Ciências Agrárias, 39(3), 1225–1238. https://doi.org/10.5433/1679-0359.2018v39n3p1225

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