Use of Bacillus as a Plant Growth-Promoting Rhizobacteria to Improve Phosphate and Potassium Availability in Acidic and Saline Soils

Bacillus is a rhizobacterium that can help with the nutrient cycle in soil. Plant growth-promoting rhizobacteria (PGPR) be found rhizosphere of many plants. This research was divided into two parts: (1) test ability genus isolates to withstand various NaCl concentrations saline and acidic soils; (2) quantification secondary metabolites produced by form hormones organic acids. valezensis (BPF2), which dissolve phosphate, sp (BPK1), subtilis (BPK2), potassium, were tested. increased availability phosphate potassium soils produced, such as acids hormone indole acetic acid. The results showed three could still phosphorous 3% addition, but concentration decreased incubation time H+15. On 30th day, inoculation improved soil up 88% 73% compared control. other hand, sp. raised until day 10, reaching maximum 0.37 me.100g−1. PGPRs (Bacillus valezensis, sp., subtilis) 13.25, 11.97, 14.97 g.mL−1 acid metabolites, respectively. Acetic, lactic, citric, malic, oxalic among produced. most lactic at 4.94 mg.L−1, while acid, 2.91 2.55 mg,L−1, respectively.
 Keywords: Bacillus, Organic Indole