Author(s)

Affi Jeanne Bongoua-Devisme^1*, Sainte Adélaïde Ahya Edith Kouakou¹, Konan-Kan Hippolyte Kouadio¹, Franck Michaël Lemonou Bahan²

¹Department of Pedology and Agricultural Durable, FHB University, Abidjan, Côte d’Ivoire.
²Center National of Research Agronomic-CNRA, Man, Côte d’Ivoire.

In agricultural soils, phosphorus is often limited, leading farmers to employ artificial supplementation through both inorganic and organic fertilization methods due to its restricted availability. Soil fertilization has the potential to augment both the abundance and diversity of bacterial communities. Our study aimed to assess the effects of phosphate amendments, derived from natural phosphate rock, and chemical fertilizers (TSP, NPK), on the density and diversity of bacterial communities within the study plots. We developed and applied eight phosphate amendments during the initial cultivation cycle. Soil samples were collected post 1^st and 2^nd cultivation cycles, and the quantification of both total and cultivable phosphate-solubilizing bacteria (PSB) was conducted. Additionally, we analyzed bacterial community structure, α-diversity (Shannon Diversity Index, Evenness Index, Chao1 Index). The combination of natural phosphate rock (PR) and chemical fertilizers (TSP, NPK) significantly increased (p < 0.05) both total cultivable aerobic bacteria (24 to 8500 × 10⁷ bacteria/g dry soil) and phosphate-solubilizing bacteria (0.01 to 6.8 × 10⁷ PSB/g dry soil) in comparison to unamended control soils. The diversity of bacterial phyla (Firmicutes, Actinobacteria, Proteobacteria, Halobacterota, Chloroflexia) observed under each treatment remained consistent regardless of the nature of the phosphate amendment applied. However, changes in the abundance of the bacterial phyla populations were observed as a function of the nature of the phosphate amendment or chemical fertilizer. It appears that the addition of excessive natural phosphate rock does not alter the number and the diversity of soil microorganisms population despite successive cultivation cycles. However, the addition of excessive chemical fertilizer reduces soil microorganisms density and structure after the 2^nd cultivation cycle.

Phosphate Amendments, Phosphate Solubilizing Bacteria, P-Cycle Genes, Chemical Fertilizer

Bongoua-Devisme, A.J., Kouakou, S.A.A.E., Kouadio, K.-K.H. and Bahan, F.M.L. (2024) Integrated Effects of Phosphate Rock and Chemical Fertilizers on the Dynamics of Soil Bacterial in Acidic Rice Paddy Soils of Man (Ivory Coast). Advances in Microbiology, 14, 513-531. doi: 10.4236/aim.2024.1410035.