African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6849

Full Length Research Paper

Spatial variability of physical attributes of cambisol under cassava cultivation in Southern Amazonas

Ivanildo Amorim de Oliveira
  • Ivanildo Amorim de Oliveira
  • Departamento de Solos e Adubos, Faculdade de Ciências Agrárias e Veterinárias, UNESP. Via de Acesso Prof. Paulo Donato Castellane. CEP.: 14870-900, Jaboticabal, SP, Brasil.
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Milton César Costa Campos
  • Milton César Costa Campos
  • Departamento de Agronomia, Universidade Federal do Amazonas, Rua 29 de Agosto, 786, Centro, CEP.: 69.800-000, Humaitá-AM, Brazil.
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Renato Eleoterio de Aquino
  • Renato Eleoterio de Aquino
  • Departamento de Solos e Adubos, Faculdade de Ciências Agrárias e Veterinárias, UNESP. Via de Acesso Prof. Paulo Donato Castellane. CEP.: 14870-900, Jaboticabal, SP, Brasil.
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Douglas Marcelo Pinheiro da Silva
  • Douglas Marcelo Pinheiro da Silva
  • Departamento de Agronomia, Universidade Federal do Amazonas, Rua 29 de Agosto, 786, Centro, CEP.: 69.800-000, Humaitá-AM, Brazil.
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Jose Mauricio da Cunha
  • Jose Mauricio da Cunha
  • Departamento de Agronomia, Universidade Federal do Amazonas, Rua 29 de Agosto, 786, Centro, CEP.: 69.800-000, Humaitá-AM, Brazil.
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Zigomar Menezes de Souza
  • Zigomar Menezes de Souza
  • Departamento de Agronomia, Universidade Federal do Amazonas, Rua 29 de Agosto, 786, Centro, CEP.: 69.800-000, Humaitá-AM, Brazil.
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Marcelo Dayron Rodrigues Soares
  • Marcelo Dayron Rodrigues Soares
  • Departamento de Água e Solo, Universidade Estadual de Campinas, Avenida Candido Rondon, 501, Barão Geraldo, CEP.: 13083-875, Campinas-SP, Brazil.
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Ludmila de Freitas
  • Ludmila de Freitas
  • Departamento de Solos e Adubos, Faculdade de Ciências Agrárias e Veterinárias, UNESP. Via de Acesso Prof. Paulo Donato Castellane. CEP.: 14870-900, Jaboticabal, SP, Brasil.
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  •  Received: 17 November 2014
  •  Accepted: 16 July 2015
  •  Published: 03 December 2015

Abstract

The aim of this research was to evaluate the spatial variability of soil properties of a haplic cambisol under cassava cultivation in Humaitá County, AM - Brazil. The mapping of a cassava growing area was made and a 70 × 70 m square mesh designed. In the mesh, soil samples were performed in a regular spacing of 10 m at a 0.0 to 0.2 m depth, being a total of 64 sample points. Physical analyses were made (texture, soil bulk and particles density, macro and microporosity, total porosity and aggregates stability in water). Descriptive statistics and geostatistical analyses were performed. Except for the clay fraction, all remaining physical attributes presented strong and moderate spatial dependence. The searched variables showed a higher “reach” range than those established in the area, which indicates that larger spacing between points can be applied for future studies. Geostatistical techniques have presented as an efficient tool for soil attribute studies under cassava cultivation in Humaitá-AM, Brazil.

 

Key words: Kriging, geostatistics, spatial dependence.