Abstract

Background and Objective: Microorganic services like Phosphate Solubilizing Bacteria (PSB) has been shown to enhance the solubilization of insoluble P compounds and produce IAA hormone. There are widely factors effected on phosphatases activities such as the microbial in the soil, soil temperature, soil moisture, the diversity of bacteria associated, the development of the crop, the root system of the plant and the location ectomycorrhiza. The purpose of this study is to address the influence of different intercropping with rubber plantation practices on Phosphate Solubilizing Bacteria (PSB). Methodology: The present study was to characterization and estimate the variability of specific PSB isolates from banana, cassava and Mucuna bracteata under rubber plantations, in order to make the suggestions regarding fertility management in the poor sandy soils of the region. Results: The results of the present study showed that four pure isolates encodes PSB-M-01, PSB-M-02, PSB-B-01 and PSB-C-01 were obtained after intercropping with rubber trees and it was observed that PSB isolate from Mucuna bracteata (PSB-M-01) best solubilised Ca3(PO4)2 and AlPO4 by releasing inorganic phosphate of approximately 1,050.90 and 561.32 mg P L–1, respectively. Finally, the IAA production was analysed, the results showed that bacterium 5-2 (2013) isolates from root rhizosheres of M. bracteata produced a significantly (p≤0.01) higher amount of IAA hormone (962.53 mg L–1) over the other PSB isolates. Conclusion: These results highlight variability of specific PSB isolates from different rhizospheres of intercropping under rubber tree plantation and could be good bio-fertilizers for improving phosphorus plant nutrition.