Aims: This study aims to identify agronomic traits responsible for the variation between 20 accessions of Bambara groundnuts in order to retain adapted genotype on pedoclimatic conditions of the Sudano-Sahelean area of Cameroon. Place and Duration of Study: This study was carried out on July 2015 in Dang on Sudano-Guinean zone of Cameroon in order to identify agronomic traits responsible for variation among 20 accessions of Bambara groundnuts. Methodology: The experimental design in field is a block completely randomized with 3 repetitions. Eleven quantitative characters selected among the describer of Bambara groundnut were evaluated by the multivariate analysis. Results: The analysis of variance shows a significant difference for ten characters among eleven characters studied which show an important variability between these characters. Seven characters are correlated on two prime of principles components which explaining 44.32 % of total variability. Dendrogram rising of hierarchical classification permit to differentiate 5 groups of morphological diversity. The fifth group gathers the earliest varieties with a time of 121 days maturity. Highly positive correlation is (r=0.72). Characters analyzed may constitute some base of criterion to differentiate the varieties from others regions and must be used on the program of improvement varieties of Bambara groundnut in Cameroon. Conclusion: In all of the 11 characters evaluated in this study, only one of them could not differentiate the accessions. Important variability between characters was observed. The rising of hierarchical classification showed one of important agronomic diversity and regroup the accessions in 5 groups.

Aims: Aims of this study was to improve the growth of Maize (Zea mays) in the Adamawa region specially characterized by Sudano-Guinean and Sudano-Sahelean Savannah area. Localization of Site Study: Study was conducted out on Jun 2021 in Bini-Dang, in order to identify suitable strains of Microorganisms Solubilizing Phosphorus (MSP) of roots and rhizosphere of Zea mays. Ten strains of Microorganisms Solubilizing Phosphorus (MSP) of roots and rhizosphere of Zea mays were sampled. Methodology: The experimental design was three blocks completely randomized with 132 plots. A total of 11 treatments were considered during the experiment. Different treatments are constituted: BN, NBB, BNB17, RBNBB5, SSL9, SDB6, RKB1, BG12, SDL4, RDB1 and Control) repeated 12 times. Parameters were: germination time, number of leaves, height of plants, diameter of stem, date of flowering and the number of cobs per plant. Results: Our results showed that Bacteria solubilizing phosphorous was significantly (P<0.05) improve yields of plants compared to non-inoculated control in all treatments. Germination time, the number of leaves, the height of plants, the diameter of stem, the flowering and the number of cobs per plant were statistically (P<0.05) most important with uses of strains microorganisms solubilizing phosphorous in block 2, which received Natural Phosphorus (NP) and inoculated by Microorganisms Solubilizing Phosphorous in the block 3 (inoculated with MSP). Conclusion: Strains of MSP improves the germination, growing and number of cobs per plants of Zea mays in solubilizing Natural Phosphorous (NP). The strains of MSP, BNB7, BNB17, RBNB5, BN and SDB6 were significantly most performants, compared to others strains effect on field. The MSP could be used as biological fertilizers by direct application on soils with Natural Phosphorous (NP).