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

Spatial variability of weeds in an Oxisol under no-tillage system

Glécio Machado Siqueira
  • Glécio Machado Siqueira
  • Department of Geoscience, UFMA - Federal University of Maranhão, Av. dos Portugueses, 1966, Bacanga, CEP 65080-805, São Luís – MA, Brazil.
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Raimunda Alves Silva
  • Raimunda Alves Silva
  • Department of Geoscience, UFMA - Federal University of Maranhão, Av. dos Portugueses, 1966, Bacanga, CEP 65080-805, São Luís – MA, Brazil.
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Alana das Chagas Ferreira Aguiar
  • Alana das Chagas Ferreira Aguiar
  • Department of Biology, UFMA - Federal University of Maranhão, São Luís – MA, Brazil.
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Mayanna Karlla Lima Costa
  • Mayanna Karlla Lima Costa
  • Department of Geoscience, UFMA - Federal University of Maranhão, Av. dos Portugueses, 1966, Bacanga, CEP 65080-805, São Luís – MA, Brazil.
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Ênio Farias França e Silva
  • Ênio Farias França e Silva
  • Department of Rural Technology, UFRPE - Federal Rural University of Pernambuco, Recife – PE, Brazil.
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  •  Received: 12 April 2016
  •  Accepted: 02 June 2016
  •  Published: 21 July 2016

Abstract

In the global agribusiness, the herbicide use is a major problem for sustainable production, in this sense, it is necessary to better understand the interaction of weed species and floristic composition such as biodiversity indicators. The objective of this study was to analyze the spatial variability of weeds in an Oxisol under no-tillage system. Samples were taken in an area of 0.5 ha, in 50 sampling points with spacing of 5 m x 10 m. Data were analyzed by means of classical statistics, geostatistics, and spatial variability of the constructed maps by the interpolation by kriging technique. All the species of weeds presented in the study area showed spatial variability with the exception of Ipomoea triloba (L.) and Heliotropium indicum (L.), which showed pure nugget effect. The range values (a) shows that the spacing between samples can be extended to all species of weeds. The study was unable to determine specifics areas of management in the local since the different species of weed infested different plots of the area.

Key words: Precision agriculture, semivariograms, site-specific management.