Ongoing soil degradation under cotton is a constant concern for farmers in cotton-growing basins. The aim of the study was to assess soil fertility under cotton in the Ouangolodougou production basin. To do this, soil sampling of the 0-15 cm horizon was carried out in the 15 sections that make up the Ouangolodougou production basin over four (4) successive cropping campaigns from 2017-2018 to 2019-2020. Chemical analyses of soil samples were carried out on the following parameters: exchangeable calcium (Ca2+), exchangeable magnesium (Mg2+), exchangeable potassium (K+) and Ammonical Nirogen N-NH4+. Results indicate that the levels of N-NH4+ and exchangeable bases (Ca2+, Mg2+, K+) are below the average threshold values over the 4 successive tracked campaigns. Also, results demonstrated a sectional basis effect of cotton cultivation on N-NH4+, Ca2+, Mg2+, and K+.

The present study aimed to determine the variables that distinguish the hydromorphic soils (Gleysols) used in irrigated or flooded rice growing in the region of Bélier in Côte d'Ivoire and to explain the causes of their variability in order to better apprehend their use in a context of precision agriculture. To do this, a quantitative characterization of the physicochemical composition of these soils was carried out. Soil samples analyzed in the laboratory were collected at various locations in the study area on plots currently or formerly used in rice production. The analytical results of these samples were subjected to a principal component analysis that revealed four homogeneous subsets of soils. These subsets of soils were fundamentally distinct from one another by their silt, clay and organic contents which also emerged as their fertility determinants. Thus, the study will have shown the interest for the rice producers of the zone to carry out a preliminary analysis of the spatial variability of the soil parameters before any agricultural development of the soil.