Impact of Bacterial Isolates on Phosphate Amendment Solubilization in Rice Cultivation on Acidic Soils

Abstract

This study was carried out in 2023 at the National Agronomic Research Center (CNRA) station in Man, in west of Côte d'Ivoire. The aim of this study was to improve the efficiency of Phosphate Solubilizing Bacteria (PSB) in the mineralisation of various Phosphate Amendments (PA). Culture, isolation and purification tests on strains from the study site revealed the dominance of one strain. In the laboratory, it was associated with different treatments. The results show that it has a very highly significant effect on the parameters of the cultivation environment. The treatments increased pH. As the number of PSBs increased in the environment, dissolved P and Dissolved Organic Carbon (DOC) levels increased, while pH decreased over time. DOC levels were higher with inoculation (1.96 mg.kg-1). The rate of mineralised P was highest (49.5 mg.kg-1) on treatment T8 (0%PR (Phosphate Rock+100%TSP (Triple Superphosphate)) but treatment T5 (60% PR+40% TSP) would be the most appropriate for field trials; compared with day 1, it gave, on average, the highest rate of P released. The combination of PSB and PA would be a promising alternative for increasing the effectiveness of PA, particularly with regard to the use of Phosphate Rock (PR).