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

Chemical attributes of the soil in agroforestry systems subjected to organic fertilizations

Sandro Alex Helrigle Abreu
  • Sandro Alex Helrigle Abreu
  • Federal University of Goiás, Agronomy School, Zip Code: 74001-970, Goiânia, Goiás, Brazil.
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Everton Martins Arruda
  • Everton Martins Arruda
  • Federal University of Goiás, Agronomy School, Zip Code: 74001-970, Goiânia, Goiás, Brazil.
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Leonardo Rodrigues Barros
  • Leonardo Rodrigues Barros
  • Federal University of Goiás, Agronomy School, Zip Code: 74001-970, Goiânia, Goiás, Brazil.
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Risely Ferraz de Almeida
  • Risely Ferraz de Almeida
  • State University of São Paulo, Agrarian and Veterinarian Faculty, Zip Code: 18610 - 307, Jaboticabal, São Paulo, Brazil.
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Deyvid Diego Carvalho Maranhão
  • Deyvid Diego Carvalho Maranhão
  • Soil Departament, Rural Federal University of Rio de Janeiro, Zip Code: 23897-000, Seropédica, Rio de Janeiro, Brazil.
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Vanderli Luciano da Silva
  • Vanderli Luciano da Silva
  • Federal University of Goiás, Agronomy School, Zip Code: 74001-970, Goiânia, Goiás, Brazil.
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Carlos de Melo e Silva Neto
  • Carlos de Melo e Silva Neto
  • Federal University of Goiás, Agronomy School, Zip Code: 74001-970, Goiânia, Goiás, Brazil.
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Rilner Alves Flores
  • Rilner Alves Flores
  • Federal University of Goiás, Agronomy School, Zip Code: 74001-970, Goiânia, Goiás, Brazil.
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Francine Neves Calil
  • Francine Neves Calil
  • Federal University of Goiás, Agronomy School, Zip Code: 74001-970, Goiânia, Goiás, Brazil.
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Leonardo Santos Collier
  • Leonardo Santos Collier
  • Federal University of Goiás, Agronomy School, Zip Code: 74001-970, Goiânia, Goiás, Brazil.
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  •  Received: 04 May 2016
  •  Accepted: 02 June 2016
  •  Published: 07 July 2016

Abstract

The reuse of organic byproducts in agroforestry systems is a sustainable proposal, since, in addition to preserving the natural resources, it has allowed the fertilization of the soils, obtaining a reduction of costs with mineral fertilizers. Therefore, the objective of this research was to evaluate the chemical attributes of the soil after two years of successive fertilizations using cattle manure and sewage sludge in agroforestry systems. The study was conducted in Goiânia, state of Goiás, Brazil. The experimental design used randomized blocks on a 2 x 4 factorial (cultivation systems and fertilizations), with four repetitions. The cultivation systems were: agroforestry and monoculture systems. The fertilizations used were: cattle manure, sewage sludge, mineral fertilizer and control (no fertilization). Regardless of the cultivation system, the fertilizations with sewage sludge increases the calcium, phosphor and zinc contents of the soil, as well as the pH values, sum of bases and cation exchange capacity, at 0-10cm depth. However, the potassium contents are lower in relation to the use of mineral fertilizers, both at 0 to 10 cm depth and at 0 to 20 cm. Teak plants in agroforestry systems presents similar heights to the monoculture plants, and they are higher on fertilizations with sewage sludge. The soybean grain productivity in the agroforestry system presents similar outputs in relation to the use of sewage sludge and mineral fertilizers. Therefore, it is recommended for farmers to adopt agroforestry systems and the organic fertilization practice with sewage sludge, associating the quality of the chemical attributes of the soil, the growth of forest species and soybean grain yields.

Key words: Tectona grandis, sewage sludge, cattle manure, intercropping systems, soybeans.