Determining the optimum use of rock phosphate in three legumes (soybean, cowpea and groundnut) on a lithosol

The low natural fertility of the soils, their poor anthropogenic management combined with the effects of climate change contribute to the low productivity of the soils and consequently to low agricultural yields in Burkina Faso. One of the solution to remedy is the use of Rock phosphate which is proves more economical and above all ecological to soil fertility hence the interest of this study wich aims to determine an optimum use Rock phosphate in legumes The study was carried out at Ralo in the commune of Poa on a block devise of Fisher has complete randomization with five repeats and two factors (legumes and fertilization) To do so, three species of legumes (soybeans with the G196 variety, cowpea with the melackh and groundnut with the Te3 variety), five doses of fertilization,namely,RP0 urea (14kg N/ha), RP100 urea and 14kg N/ha+100kg/ha,RP200 urea and 14kg N/ha+200kg/ha, RP400 urea and 14kg N/ha+400kg/ha and TSP urea and 14kg N/ha+23kg/ha were combined in this experiment. The parameters collected are the number of plants raised, the date of 50% flowering, the number of plants harvested, the weight of the guines, the weight of 100 seeds and the yield grams. The results of the health analysis (at the threshold of 5 ENT). Show a significant difference (p0, 05) on all the parameters observed according to the legume factor of fertilization and of the treatments. The best performances in terms of seed weight, 100 grams and seed yield, cowpeas were observed with RP400, RP100, RP400 fertilizers those of soybeans were observed with RP200, RP100, RP200 fertilizers. Groundnut were observed with TSP fertilizers.