Selection of salt-tolerant bacterial strains capable of nitrogen-fixing and phosphorus-dissolving from banana root soil in Can Gio

Abstract

    Currently, the situation of saline intrusion is becoming more and more serious, affecting the yield of many crops. Therefore, the study of salt-tolerant bacterial strains with both nitrogen-fixing activity and phosphorus-dissolving ability is necessary to reduce the amount of chemical fertilizers used in agriculture while maintaining high yields, improving soil fertility and environmental safety. After isolation on LB medium, 24 strains of salt-tolerant bacteria at 4 ‰ NaCl concentration were obtained from 7 soil samples of banana rhizosphere in Can Gio. The results of testing the activity of isolates on NBRIP and Ashby medium showed that there were 10 strains having the ability to dissolve phosphorus, and 14 strains having the ability to fix nitrogen, in particular, there were 5 strains (D1, D8, D11, D14 and D17) having both the ability to dissolve phosphorus and to fix nitrogen. This result is the basis for further researches to develop microbial products for saline soils.