Caractéristiques chimiques des substrats locaux utilisés pour l'amendement des sols dans les agrosystèmes à base du cotonnier à l'Ouest du Burkina Faso

The study aimed to assess the chemical characteristics of local organic substrates used for soil amendment in the cotton-growing areas of western Burkina Faso, with the objective of promoting their better utilization. For the experiment, seven types of organic manure namely village compost, cattle manure, small ruminant manure pen soil, household waste, and two experimental manures were collected from six sites in the Tuy and Mouhoun provinces of Burkina Faso. Measurements were conducted on pH_H2O, organic matter content and the levels of major nutrients (N, P, K). The organic manures were found to range from slightly acidic to moderately basic (6.96±0.82 to 8.82±0.15) and exhibited acceptable organic matter contents (13.56±5.03% to 38.05±10.46%) compared to the recommended standards (10% to over 30%). The concentrations of major nutrients ranged from 0.27±0.05% to 1.39±0.5% for nitrogen, 1551.77±1082.16 to 4261.18±2810.25 mg/kg for phosphorus and 2246.85±1409.36 to 19654.86±8889.82 mg/kg for potassium. With the exception of household waste, the results indicated that the substrates could be recommended as fertilizers in combination with mineral fertilizers. From the perspective of optimal valorization, producing these organic substrates under appropriate conditions and with the addition of suitable enrichers such as naturel phosphate, dolomite, and plant ashes appears to be a promising approach to further enhance their fertilizing value.