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Applied and Environmental Soil Science
Volume 2013 (2013), Article ID 601058, 7 pages
http://dx.doi.org/10.1155/2013/601058
Research Article

A Case of Cyperus spp. and Imperata cylindrica Occurrences on Acrisol of the Dahomey Gap in South Benin as Affected by Soil Characteristics: A Strategy for Soil and Weed Management

1Felix Houphouet Boigny University, Soil Science Department, 22 BP 582, Cocody, Abidjan 22, Cote d'Ivoire
2University of Abomey-Calavi, Departement of Agronomy Sciences, BP 499, Calavi, Benin
3Africa Rice Center, BP 2031, Cotonou, Benin
4CIRAD, UPR Hortsys, 34398 Montpellier Cedex 05, France

Received 7 October 2012; Revised 15 April 2013; Accepted 28 April 2013

Academic Editor: Philip J. White

Copyright © 2013 Brahima Kone et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Because of the limiting efficacy of common weed control methods on Cyperus spp. and Imperata cylindrica their occurrences in tropical agroecologies and the effect of soil properties in suppressing these species were investigated in south Benin (Cotonou), a typical ecology of the Dahomey gap. Weeds and soil samples were collected twice early and later in the rainy season in 2009 at four topographic positions (summit, upper slope, middle slope, and foot slope). Sampling was done according to Braun-Blanquet abundance indices (3 and 5) and the absence (0) of Cyperus and Imperata in a quadrat, respectively. The relationship between their respective abundances and soil parameters (texture, C, N, P, K, Na, Ca, Mg, and Fe) was explored. Weed occurrence was less related to soil texture, and Imperata growth was more influenced by soil nutrients (K, Ca, and Fe) than Cyperus spp. Soil cation ratios of K : Mg and Ca : Mg were the main factors that could be changed by applying K and/or Mg fertilizers to reduce Cyperus and/or Imperata occurrence. Maintaining high Fe concentration in soil at hillside positions can also reduce Imperata abundance, especially in the Dahomey gap.