African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6578

Full Length Research Paper

Productivity and physical properties of corn grains treated with different gypsum doses

Vitor Marques Vidal*
  • Vitor Marques Vidal*
  • Federal Institute of Goiás (Instituto Federal Goiano – Ifgoiano), Goiás GO Brazil.
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Frederico Antonio Loureiro Soares
  • Frederico Antonio Loureiro Soares
  • Federal Institute of Goiás (Instituto Federal Goiano – Ifgoiano), Goiás GO Brazil.
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Marconi Batista Teixeira
  • Marconi Batista Teixeira
  • Federal Institute of Goiás (Instituto Federal Goiano – Ifgoiano), Goiás GO Brazil.
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Fernando Nobre Cunha
  • Fernando Nobre Cunha
  • Federal Institute of Goiás (Instituto Federal Goiano – Ifgoiano), Goiás GO Brazil.
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Wilker Alves Morais
  • Wilker Alves Morais
  • Federal Institute of Goiás (Instituto Federal Goiano – Ifgoiano), Goiás GO Brazil.
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Nelmício Furtado da Silva
  • Nelmício Furtado da Silva
  • Federal Institute of Goiás (Instituto Federal Goiano – Ifgoiano), Goiás GO Brazil.
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Cícero Teixeira Silva Costa
  • Cícero Teixeira Silva Costa
  • Federal Institute of Goiás (Instituto Federal Goiano – Ifgoiano), Goiás GO Brazil.
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Giovani Santos Moraes
  • Giovani Santos Moraes
  • Federal Institute of Goiás (Instituto Federal Goiano – Ifgoiano), Goiás GO Brazil.
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Janniny Alves Cabral
  • Janniny Alves Cabral
  • Federal Institute of Goiás (Instituto Federal Goiano – Ifgoiano), Goiás GO Brazil.
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Flávio Henrique Ferreira Gomes
  • Flávio Henrique Ferreira Gomes
  • Federal Institute of Goiás (Instituto Federal Goiano – Ifgoiano), Goiás GO Brazil.
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  •  Received: 21 July 2016
  •  Accepted: 26 August 2016
  •  Published: 06 October 2016

Abstract

The productivity of corn grains is directly associated with factors related to soil fertility, which are relevant to the application of gypsum (calcium sulphate), in addition to variables inherent to the grain. Thus, the objective of this study was to evaluate the variability of the physical properties of grains (circularity, roundness, bulk density, real density, volume and porosity) and production components (productivity and weight of 1,000 grains) of corn irrigated with increasing doses of gypsum, and evaluate the effects of direct and indirect associations of physical properties of grains and weight of 1,000 grains on grain productivity. The soil of the experiment was a Dystrophic Red Latosol. The experiment was conducted using a random blocks design. An analysis of variance by F test and a univariate regression analysis were performed regarding the relations among culture variables with different doses of gypsum (0.0, 2.5, 5.0, 7.5 and 10 t ha-1). An analysis of variance by t test was also performed together with a multivariate analysis using a path analysis with multicollinearity in order to analyze the direct and indirect effects of the physical properties of grains and weight of 1,000 grains on productivity. The bulk density of the grains had a direct effect on productivity of corn grains. In addition, the decrease in bulk density in function of the increase of gypsum doses is attributed to a greater increase in porosity in relation to weight of 1,000 grains.

Key words: Zea mays L., calcium sulphate, path analysis, bulk density.