Adding protein materials as solid-state fermentation media for producing bio-organic fertilizers with functional microbes.

The possibility of utilization of feather powder and rapeseed cake as solid- state fermentation media to produce bio-organic fertilizers with plant growth-promoting rhizobacteria(PGPR) strain Bacillus amyloliquefaciens NJN-6 was investigated in this study. The results showed that addition of rapeseed cake and feather powder efficiently solid-state fermented PGPR strain NJN-6 with the optimum additive amount of 100 g·kg-1 ( dry weight), improved the nutrient contents in the novel bio-organic fertilizers and significantly promote banana plant growth. After transplanting for 40 days,the fresh biomass of the above-and below-ground parts of banana plants in treatment 2 supplied with bio-organic fertilizer produced by adding rapeseed cake were 1. 26 and 1. 16 times of that in the CK supplied with chemical fertilizer,and increased by 28. 7% and 31. 2% compared to the treatment 1 supplied with bio- organic fertilizer produced with no exogenous protein resource,while the value for banana plants in treatment 3 treated by bio-organic fertilizer produced by feather powder addition was 1. 18 and 1. 12 times,and increased by 20. 6% and 26. 9%,respectively. After transplanting for 70 days, compared to treatment 1, treatment 2 increased the plant height and stem diameter by 25. 95% and 10-72%,respectively,while treatment 3 increased by 16. 22% and 8. 74%,respectively. In conclusion,although the bio-organic fertilizer supplemented with rapeseed cake more significantly promoted banana growth than that supplemented with feather powder, the latter one still had certain advantages in solid-state fermentation of the PGPR strain and promoting banana growth,indicating a possibility to produce bio-organic fertilizer(BOF)using feather powder. [ABSTRACT FROM AUTHOR]