TIỀM NĂNG SỬ DỤNG VI SINH VẬT ĐỐI VỚI CÂY LẠC TRÊN ĐẤT CÁT BIỂN TẠI BÌNH ĐỊNH

This study was conducted to evaluate the potential uses of nitrogen fixing bacteria Bradyrhizobium japonicum (RA18), phosphorous solubilizing bacteria Bacillus megaterium (P1107), potassium solubilizing bacteria Paenibacillus castaneae (S3.1) and polysaccharide synthesized yeast Lipomyces starkeyi (PT5.1). These microorganisms were isolated from rhizosphere or nodules of groundnut. In greenhouse condition, the results showed that separated or combined infection of microorganisms increased 30% of the NPK uptake. The result on the field of coastal sandy soil in Binh Dinh province showed use of microbial products to have a positive effect on the content of NPK, humidity and density of microbial in the soil. Using microbial products and 100% of NPK in accordance with local recommendation for groundnut increased to 17% of the tree height, 16.7% of green biomass, 14% of productivity and increased 8.1 million VND/ha for profit compared to control (using 100% basal NPK with no microbial products). Using microbial products and reducing 30% of NPK showed equivalently growth and productivity of groundnut comparing to control Our studies clearly show that the combination of microorganisms tested has the potential to commercialize microbial inoculants for use in groundnut in sandy soil in Binh Dinh province of Vietnam.