Bio-organic fertilizer containing dead bacillus vallismortis, and preparation method and application thereof

The invention provides a bio-organic fertilizer prepared by combining dead bacillus vallismortis and a straw organic fertilizer through secondary solid fermentation, and a preparation method and application thereof. The content of dead bacillus vallismortis in the bio-organic fertilizer after the secondary solid fermentation is finished is taken as a detection index, the optimal culture condition combination of the bio-organic fertilizer is obtained by screening through a single-factor method and a multi-factor and multi-level orthogonal method, and the fermentation process of the bio-organic fertilizer is optimized. The BIO-4 bio-organic fertilizer, which is researched and developed by taking a corn straw organic fertilizer as a matrix and taking dead bacillus vallismortis SZ-4 as a biocontrol bacterium source, has a good prevention and control effect on root rot caused by fusarium solani, has a promoting effect on crop growth, and is beneficial to increase of crop yield and improvement of quality. 本发明提供了一种死