Abstract
Objective: To assess the effects of the legume (Pueraria phasoeloïdes) on the chemical parameters of the waste rock soils (saprolites) at the Agbaou gold mine, in the center-west of Côte d’Ivoire. Methodology and results: Soil samples were taken using the systematic sampling method at regular intervals of 20 m on the ramps and at 20 cm soil depth, using an auger during two consecutive sampling campaigns (2016-2017 and 2017-2018). The geometric coordinates of the sampling points were obtained using a GPS Garming CSX60 type. A total of 20 composite samples were made from 80 collected soil samples. Chemical analyzes were carried out on soil samples obtained. The results show that the contents of total organic carbon (TOC), total organic nitrogen (Nt), the C: N ratio and the pH values of the soils, under Pueraria phaseoloïdes legume were significantly improved between the ramps and between the two campaigns (p <0.05). Conversely, (CEC, exchangeable bases, (Ca2+, Mg2+ and K+) and phosphorus contents decreased significantly (p <0.001) between the ramps and the two campaigns. This reflects the improving effect of the legume on the chemical parameters of the soils. However, variations in trace element content between ramps and across campaigns did not show any significant improvement (p> 0.05).
Highlights
The policy of Côte d'Ivoire has been reoriented towards the exploitation of subsoil resources in recent decades to increase state revenue
The results show a variation in chemical parameters from one ramp to another and from one campaign to another
Due to the effect of Pueraria phaseoloïdes, the pH values of the waste rock increased from one season to another and decreased from the lower slopes to the upper slopes
Summary
The policy of Côte d'Ivoire has been reoriented towards the exploitation of subsoil resources in recent decades to increase state revenue This new vision does not go without causing damage to the environment, where soil is an important component. Mining has a negative impact on components such as water, soil, air and flora (Christine, 2002; GREP, 2012) It leads to the destruction of vegetation cover, deforestation, environmental pollution, loss of biodiversity (Taylor et al, 2004; Jaques et al, 2006; Ouédraogo, 2006; Andriamasinoro et al.). Several authors (Didby, 1999; Johane, 2011) have proposed solutions to mitigate the adverse effects of mining activities on the environnement. These includes soil restoration, site rehabilitation, phytoremediation, mycoremediation, preplanting grassing and levelling of barren rock piles followed by topsoil cover. Surfaces are seeded with grasses such as Pennisetum pedicellatum and Andropogon gayanus (Hardarson and Danso, 1993)
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