Ricinodendron heudelotii var. heudelotii is a highly prized forest species, used in the form of seasoning by the populations of Côte d'Ivoire. It is becoming rare due to the abusive exploitation of wood. Its ecological and agroforestry importance is attracting a lot of interest and makes its domestication a priority. The aim of this study is to evaluate the influence of the type of stem and of substrate for propagation by cuttings in regeneration of this forest species. To this end, 14 cm long softwood and semi-hardwood cuttings were taken from mature trees and planted in arable, urea and sawdust substrates. The topsoil gave the best growth recovery rate of 76.11% followed by the soil-urea substrate with 44.44% and the lowest rate was observed with the sawdust substrate with 18.89%. In addition, 81.11% of the semi-hardwood cuttings budded compared to 52.22% for the softwood cuttings. A total of 37.65% of plants survived. the semi-hardwood cuttings proved to be more efficient for the production of Ricinodendron heudelotii plants than the softwood cuttings which gave a very high mortality rate. Semi-hardwood cuttings would contain sufficient nutrient reserves for root development and growth recovery. This study proved that in vivo propagation by cuttings could be a real alternative to the regeneration of this woody species.

This study highlighted the symbiosis between Anabaena-azollae cyanobacteria and Azolla aquatic fern in the production of Azolla filiculoides and its use as a biofertilizer. His trial of vegetative production using ordinary water + dung, carried out in 14 days of culture, showed a significant amount (6473g). Then, the use of this one as an amendment for the growth of CB-one rice, showed its positive impact on soil fertility thus translating high yields of CB-one rice contrary to the unamended witness. Indeed, with this treatment, the average number of tillers observed after 56 days of culture, was 18.1 ± 4.23 tillers contrary to the NPK (15.83 ± 4.98) and the control (10, 4 ± 3.27). The average number of leaves was significant in Azolla (57.20 ± 13.45), average for the NPK fertilizer (48.86 ± 15.79) and low for the control (34.83 ± 14, 52). In sum, the trays treated with Azolla filiculoides produced many more panicles and grains compared to treatments. As a result, Azolla is likely to restore soil fertility by providing the soil with the nutrients needed for crop productivity.

In the context of the global change, the loss of biodiversity in the forests-savannas mosaic zone of West Africa constitutes a growing problem. The sale of cashew nuts remains one of the main economic resources of C