Three-acid mixed fermentation bio-organic fertilizer and preparation method of fertilizer as well as application of fertilizer in tobacco planting

The invention discloses a three-acid mixed fermentation bio-organic fertilizer which uses rapeseed dregs, bean pulp, fulvic acid and fermentation microorganism bacterium agents as raw materials, the raw materials are fermented and then the fermented raw materials are mixed with a functional microorganism bacterium agent and microelement chelate powder to form a novel bio-organic fertilizer which is rich in fulvic acid, amino acid, linoleic acid and other organic acids and function microbial flora, is high in fertilizer efficiency and strong in activity, and is obviously superior to common organic fertilizers in the aspects of improving soil and improving the crop resistance, yield and quality. The functional microorganism bacterium agent is prepared in the preparation process of the bio-organic fertilizer, and the functional microorganism bacterium agent is high in survival rate in the fertilizer and high in effectiveness compared with those of common bactericide. After being applied to tobacco planting, the bio-organic fertilizer can be used for promoting formation of aroma substances in tobacco, improving the tobacco quality and increasing the yield of the tobacco.