Study on the Optimal Fermentation Condition of Paenibacillus kribbensis CX-7 Strain

Mineral potassium is the main source of potassium absorbed by plants. Paenibacillusstrain has the function of solubilization soil minerals and releasing soluble potassium. In order to utilize the soil microorganismsfurther, the optimal condition of Paenibacillus kribbensis CX-7 strain screened from the wheat soil of Shanxi of China has been studied. Through signal factor experiment and orthogonal test, the best medium ratio has been get, which is 5% starch, 1.5% soybean powder, 0.07% MgSO4, 0.05% NaCl and 0.05% yeast extract. The optimal culture condition is seed age 20 h, medium volume 30mL/250mL, seed value 4%. Theoretical bases has been provided for the industrial manufacturing and agricultural application of CX-7 strain.