African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6576

Full Length Research Paper

Effect of nitrogen and potassium fertilizations on elephant grass genotypes used for energy purposes in Northern Rio de Janeiro State, Brazil

Brunno de Oliveira Almeida*
  • Brunno de Oliveira Almeida*
  • Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brazil.
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Rogerio Figueiredo Daher
  • Rogerio Figueiredo Daher
  • Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brazil.
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Antonio Alonso Cecon Novo
  • Antonio Alonso Cecon Novo
  • Instituto Federal Fluminense, Campus Bom Jesus do Itabapoana, Bom Jesus do Itabapoana, RJ, Brazil.
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Geraldo de Amaral Gravina
  • Geraldo de Amaral Gravina
  • Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brazil.
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Marcelo Vivas
  • Marcelo Vivas
  • Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brazil.
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Cassia Roberta de Oliveira Moraes
  • Cassia Roberta de Oliveira Moraes
  • Instituto Capixaba de Pesquisa, Assistência Técnica e Extensão Rural, Presidente Kennedy, ES, Brazil.
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Bruna Rafaela da Silva Menezes
  • Bruna Rafaela da Silva Menezes
  • Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, Brazil.
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Eduardo Peres Furlani
  • Eduardo Peres Furlani
  • Universidade Federal de Juiz de Fora, Juiz de Fora, MG, Brazil.
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Maria do Socorro Bezerra de Araujo
  • Maria do Socorro Bezerra de Araujo
  • Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brazil.
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Veronica Brito da Silva
  • Veronica Brito da Silva
  • Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brazil.
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  •  Received: 31 August 2016
  •  Accepted: 31 October 2016
  •  Published: 08 December 2016

Abstract

Similar to many other human activities, the energy sector has a global concern with environmental issues. The use of renewable energy sources such as biomass is an alternative to the use of fossil fuels. Eight elephant grass genotypes showing energy production potential were herein assessed. The genotypes were grown from February 2014 to March 2016 in Campos dos Goytacazes County – Rio de Janeiro State, Brazil. They were fertilized with three different nitrogen doses (400, 1000 and 1600 kg N ha-1) and two potassium doses (200 and 500 kg K2O ha-1). The experiment followed a randomized block design, with three repetitions, using a split-plot factorial scheme. The aim of the current study was to assess the effect of different nitrogen and potassium doses in fertilizing different genotypes of elephant grass by analyzing the morphoagronomic traits. The lowest K dose (200 kg ha-1) was enough to generate the best outcomes in characteristics presenting significant effects. The N increase in the fertilization process did not promote dry matter production gains. The lowest N dose (400 kg ha-1) was enough to promote the highest values. As for the other traits assessed in the current study, although there was a genotype that showed statistically significant difference from any other genotype at a particular dose, the increasing N doses in the fertilization did not influence the performance of the genotypes.

Key words: Renewable energy, biomass, mineral nutrients, Pennisetum purpureum Schum.