African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6688

Full Length Research Paper

Soil physical and chemical properties under continuous maize cultivation as influenced by hedgerow trees species on an alfisol in south western Nigeria

  D. J. Oyedele1, O. O. Awotoye2* and S. E. Popoola3
  1Department of Soil Science, Obafemi Awolowo University, Ile-Ife, Nigeria. 2Institute of Ecology and Environmental Studies, Obafemi Awolowo University, Ile-Ife, Nigeria.
Email: [email protected]

  •  Accepted: 22 June 2009
  •  Published: 31 August 2009

Abstract

 

In the sub-humid tropical Africa, the pressure of diminishing land resources resulting from the rapidly increasing population has made the traditional fallow systems used for the replenishing soil fertility impossible. Alley cropping has been suggested as an alternative to bush fallowing. This study evaluated the effects of 20 years of different species of hedgerow crops on the physical and chemical properties of soil. Soil physical and chemical properties were studied underPterocarpus santalinoidesGliricidia sepium, Enterolobium cyclocarpum andLeucaena and leucocephala intercropped with maize (Zea mays L.) at a 20 years old Leventis Foundation Farm, at Ilesa in the south western part of Nigeria. Soil bulk density was significantly reduced under the hedgerow species from a maximum of 1.52 g cm-3 under control to 1.33 g cm-3 under Pterocarpus andEnterolobium hedgerows. While the soil cone penetrometer resistance index followed a similar trend, the soil field capacity was lowest under Pterocarpus and highest under Leucaena hedgerows. Soil porosity increased significantly (p < 0.05) from 0.38 under control to a maximum of 0.47 under Pterocarpus, while the hydraulic conductivity at a suction of -0.5 cm was significantly highest Gliricidiahedgerow. Soil pH and other chemical properties were consistently highest underLeucaena and consistently Gliricidia hedgerow. Overall among the screened hedgerow species, G. sepium showed the best promise in terms of improvement in both soil physical and chemical properties.

 

Key words: Hedgerow, alley cropping, hydraulic conductivity, Pterocarpus, Gliricidia, Leucaena, Enterolobium, cone penetrometer resistance, field capacity.