Construction of Phosphate-Solubilizing Microbial Consortium and Its Effect on the Remediation of Saline-Alkali Soil

In this study, phosphate solubilizing bacteria (PSB) with good phosphate-solubilizing capability were isolated from phosphogypsum (PG) storage yard, and phosphate-solubilizing bacteria without antagonistic effect were selected to construct phosphate solubilizing microbial consortium (PSMC), and the synergistic effect of PSMC and PG on the physical and chemical properties of saline-alkali soil, soil enzyme activity, soil bacterial diversity, and the growth index and biomass of peanut plants were explored. The results showed that the effect of phosphorus containing soil amendment on saline-alkali soil was better than that of single PSMC or PG. In the T6 group (untreated saline-alkali soil (1.5 kg) + PSMC stock solution (15 mL) + PG (6.0 g)), the pH of saline-alkali soil decreased from 8.54 to 7.03, the content of organic matter increased by 6.64%, the content of alkali hydrolyzable nitrogen, available phosphorus and available potassium increased by 81.68%, 60.31%, and 42.03%, respectively, and the activity of alkaline phosphatase increased by 94.95%. In addition, the electrical conductivity value in T4 group (untreated saline-alkali soil (1.5 kg) + PSMC stock solution (15 mL) + PG (3.0g)) decreased significantly by 20.21%. The diversity and richness of bacterial community in T4 group were the highest, and the growth of peanut plants was the best. The fresh weight of roots and stems increased by 73.34% and 116.6%, respectively. In conclusion, the phosphorus containing soil conditioner prepared by PSMC and PG can effectively improve the soil environment of saline-alkali soil and promote the resource utilization of saline alkali soil.