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Integrated Numerical Simulation of Water Resources in Crystalline Aquifers at kouéWatershed Scale(Western Cote d’Ivoire)

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Journal of Geoscience and Environment Protection 2019年第7期7卷 202-221页

作者： Vincent T.Assoma Martial Z.konan Christian G.Adon fernand k.kouamé Laboratory of Science and Technology of Water and Environment University of Félix Houphouet-BoignyAbidjanCote d’Ivoire

The present work applied the HydroGeoSphere (HGS) model in humid tropical area to koué watershed scale to simulate flows in porous and fractured area of crystalline aquifers. It integrates rainfall, physiographic, fractures, hydraulic drilling and hydrodynamic data. The simulation of flows in porous area concerned 5 test zones. The input database of the model is implemented on a triangular grid in porous area using Gridbuilder software and interactive block grid in fractured area. In order to use the model in these two environments, boundary condition was set. The infiltrations rate of the earth layers is estimated in the order to 10-5 ms-1. The model simulates the pumping with a good reproductivity of the drawdown profiles of groundwater at the drillings. The storage coefficients vary between 9.9 × 10-4 and 2 × 10-3. The hydraulic conductivities vary from 8.5 × 10-6 to 2 × 10-5. 73.9% of the drillings studied has a high hydraulic conductivity and shows a strong drawdown of the groundwater table. The study of the static levels of the ground water allowed indicating the distribution of the water resources in the drillings: 57% are deep in the first 10 meters, 36% between 10 and 20 m, and 7% in the higher level to 20 m deep in the earth.

关键词： Crystalline Aquifer Hydrogeological Modelling HydroGeoSphere Water Resource koué Watershed Cote d’Ivoire

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Improving the Quality of Rubber Plants in Bagged Nurseries by the Use of Compost-Based Culture Substrates

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Open Journal of Soil Science 2021年第11期11卷 567-585页

作者： Jean Lopez Essehi Eric Francis Soumahin Guy fernand Yao Samuel Obouayeba Albert Yao-kouamé National Agricultural of Research Centre Food Crop Research Station Soil Water and Plant Central Laboratory Bouaké C&#244 te d’Ivoire University Jean Lorougnon Guédé Training and Research Unit of Agroforestry Laboratory of Physiology and Plant Pathology Daloa C&#244 te d’Ivoire National Agricultural of Research Centre Research Station of Bimbresso Hevea Program Bimbresso C&#244 te d’Ivoire University Félix Houphouë t-Boigny Training and Research Unit of Earth Sciences and Mineral Resources Department of Soil Sciences Abidjan C&#244 te d’Ivoire

The decrease of fertility soils, the rarity of quality potting soil used to fill nursery bags, the high cost of chemical fertilisers and the problems associated with their use are leading planters and rubber nurserymen in developing and/or expanding areas to look for alternative and sustainable fertilization. In this perspective, a trial was carried out at Research Station of CNRA-Bimbresso and in a farmer’s environment in order to evaluate the agronomic quality of compost made from chicken droppings and dry Panicum maximum straw to improve the growth of rubber plants in bagged nurseries. Mixtures based on potting soil and/or compost in different proportions were prepared. The follow-up of the trial focused on determination of the physico-chemical characteristics of the soils, measurement of the parameters of vegetative growth and the grafting success rate evaluation of rubber plants in nursery. The results obtained show that compost-based crop substrates increase soil organic matter, nitrogen, exchangeable bases, etc., in proportion to the doses applied. For the pH, the application of compost resulted in a reduction in soil acidity of about 1.3 unit compared to the initial values at the two study sites. The vegetative behaviour of the rubber plants also shows that qualitative (height and collar diameter) and quantitative (grafting success rate) improvements were recorded in the plants raised in compost-based substrates. The production of rubber plants in bagged nurseries was optimal with compost doses of 27 t⋅ha−1 (at Bimbresso, in the southeast) and 27 t⋅ha−1 combined with fractionated application of urea (at kimoukro, in the centre), which under the conditions of the present study may be the recommended doses on rubber plants in bagged nurseries at C

关键词： Compost Soils Parameters Vegetative Growth Hevea brasiliensis Côte d’Ivoire

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