Biological eutrophic seedling substrate and preparation method thereof

The invention belongs to the technical field of seedling raising substrates, and particularly relates to a biological eutrophic seedling raising substrate and a preparation method thereof.The biological eutrophic seedling raising substrate is prepared from, by weight, 40-50 parts of organic leavening, 15-25 parts of vermiculite, 10-15 parts of montmorillonite, 5-8 parts of chitosan solution and 3-5 parts of inorganic substrate; the organic leavening is formed by fermenting coco coir, corn straw and chicken manure according to the mass ratio of 3: 2: 2, and the starch-chitosan solution is prepared by mixing chitosan, starch and water according to the mass ratio of 1: 2: 30. The problems that after an existing seedling raising substrate is watered, the interior of the substrate becomes compact, so that the air permeability and the water-retaining property are poor, a seedling raising transplanting substrate is easy to disperse, and the survival rate is low are solved, sufficient nutrition is provided for seedli