The soils of Burkina Faso are poor in major nutrients, with a particularly pronounced deficiency in phosphorus. However, the country has enormous deposits of natural phosphate (Burkina phosphate), but these are little used in agricultural production because of their slow solubilization. Phosphate rock was therefore processed to make the phosphorus more readily available to crops. This processing involved partial acidification and calcination. The objective of the study was to test the effectiveness of partially acidified (BPA) or calcined (BPC) Burkina phosphate on soil chemical properties and maize yield. A completely randomized Fisher block design with seven treatments and four replicates was therefore set up in western Burkina Faso. The treatments consisted of T0: (urea)+P (TSP)+K (KCl); T1: N (urea)+(TSP)+K (KCl)+BP; T2: N (urea)+P (BPC)+K (KCl); T3: (urea)+(BPA)+(KCl); T4: compost+T1; T5: compost+T2; T6: compost+T3. The data collected were soil chemical parameters and maize yield. At harvest, high pHwater values (5.4±0.08), high organic carbon (0.47±0.08%) and total nitrogen (0.043±0.006%) contents were observed with treatment T6. The same treatments T4 (116.99±1.70 mg/kg) and T6 (16.77±3.70 mg/kg) had the highest levels of available phosphorus. For grain yields, treatments T4 (2964±210 kg/ha) and T6 (2809±150 kg/ha) recorded the highest values. The use of BPA + compost can increase soil phosphorus content and sustainably increase maize yields in Burkina Faso compared to commercial phosphate fertilizers.
