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.

Germination is the processing of the seed until it becomes a plant. This implies the metabolic Wake thereof after absorbing water followed by imbibition. To determine the germination potential of seeds, after sorting, by direct seeding cultivation of 100 seeds per species 11 herbaceous legumes such as Abrus precatorius, Calopogonium mucunoides, Centrosema pubescens, Clitoria ternatea, Crotalaria goreensis, Crotalaria retusa, Indigofera arrecta Mimosa invisa, Phaseolus adenanthus, Pueraria phaseoloides and Schrankia leptocarpa in nursery bags was performed. The seeding depth was the same for all packets and equal to 1 cm. The density of the semi is 1 seed per bag. Then, the number of species germinated every day and their growth rate were evaluated. From the viewpoint of germination, the length of the lift phase translated dormancy variability of the population of seeds. Different exercised within a relatively short time (4-9 days) helped to note the beneficial effects of mechanical scarification as a treatment applied to seeds. After 35 days of sowing, low survival rates recorded have shown that plants are more sensitive to the vegetative stage at the stage of the adult plant.

To palliate the problems of energy and service woods shortage and decrease of soils fertility, studies are taken up in forest transition zone of Côte d’Ivoire on 20 species of dry zones arborescent leguminous. Two important objectives were defined. It is to first, identify leguminous adapted to dry areas of Côte d’Ivoire; then set pulses management technics for their use in reforestation. To do this, plants from nurseries were planted and monitored by periodic inventories. The survival, the adaptability, the vigor and the volume of wood leguminous species were evaluated. A coppice was made after coppicing trees at 30 cm from the ground at the beginning of the rainy season. Seven years after planting, 18 species have survived. Leucaena leucocephala, Leucaena shannonii, Albizia guachepele and Enterolobium cyclocarpum present high potentialities for reafforestation with a plantation strike root rate superior to 65 p. c., a middle diameter between 9.7 and 16.3 cm and woods productivity superior to 10 m3.ha-1.year-1. Cubage equations have been established for 11 arborescent leguminous species to estimate the production of wood in the transition zone. The wood technical exploitability ages of species plants are situated between 4 and 7 years. Some species react favorably to the treatment of coppicing.

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