Abstract:

To improve the fermentation effect of straw degradation bacteria, the straw degradation strain No.8 screened in the earlier stage and the straw ripening agent A, the main product in production, were used as test materials to inoculate the soil buried with mature corn straw, and urea, biochar and PEG6000 were added. The solid fermentation was carried out at 20℃ compared with the soil buried with mature corn straw without inoculum and exogenous additives. By measuring the characteristic indicators of straw fermentation products, the fermentation broth with better degradation effect on straw was selected. Fermented liquid was used for hydroponic cultivation of corn, the agricultural traits and physiological indicators of corn seedlings were measured, and the effect of exogenous additives on solid-state fermentation of straw was studied. The results showed that No.8 + biochar, No.8 strain + urea and A strain + PEG6000 significantly increased the urease activity of the straw fermentation system. The treatment of No.8 + biochar and No.8 strain + urea significantly increased the content of available phosphorus and alkali hydrolyzable nitrogen, respectively. The addition of biochar and urea to the straw degrading strain No.8, and the addition of PEG6000 to the straw ripening agent A can improve the performance of the fermentation system.

Key words: straw, straw degrading bacteria, solid state fermentation, exogenous additives, maize seedlings