Côte d’Ivoire became the first world producer of cocoa beans in 1970 by reducing forest cover and by losing biodiversity. The West-central region of the country was a former production site of cocoa, and contributed strongly to the annual supply of cocoa beans, but today, the plantations are old and the soils are poor, especially in the region of Daloa. To increase the yield of production, farmers use artificial fertilizers and the effect on cocoa trees is not really known. Our study aims to determine the agronomic characters improved by the application of the artificial fertilizer. In the plantations of the villages Dibobly, tien-oula and Zitta, non-experimental and experimental plots were installed and measures on cacao trees on a surface of 2 400m2 were realized. The results showed that the cover of flowers by feet and the number of fruits had significantly increased with fertilizer. However, the fertilizer had no really effect on the size of fruits, the mass of fruits and the number of cocoa beans. Also, the varieties of cocoa trees like Forastero and Criollo, had a different productivity for the same application of fertilizer. The productivity of the cocoa trees depends of the quality of the fertilizer but also of the cultivated variety. The results could allow improving the quality of the fertilizer and use it consequently.

One of the major challenges of agriculture in the African countries is food self-sufficiency. Within this framework, Vigna unguiculata or African bean plays a significant role. However, the level of productivity of this culture in these regions in the process of development is low. The agromorphologic characterization of niébé could make it possible to optimize the programmes of traditional selection of the more productive accessions. The objective of this study of is identified the most powerful accession being able to answer the new conditions related to the climatic changes. The study related to 16 accessions, the agro-morphological variability was evaluated on the basis of 8 parameters. The results showed that varieties N21DR, N18ZR, N10BBrp tested during the present study present an aptitude to be produced simultaneously in quantity and quality of seeds in a relatively short cycle of culture. The analysis in principal component (ACP) of the quantitative variables revealed of the very powerful accessions (cycle runs, a number of pods raised by plant, grains large and heavy) like which one can use in the programs of selection.