The invention relates to a
seedling medium and a preparation method thereof, wherein the medium comprises the following components of raw materials: one or more of
crop by-products, organic wastes, by-products generated in grass pulping process when preparing materials, and
ammonia water. The method comprises the following steps: mixing one or more of the
crop by-products, the organic wastes, theby-products of the grass pulping process when preparing the materials, and the
ammonia water, and then fermenting to
gain the medium, wherein nitrogenous condensate water generated when concentratingblack liquid generated in a neutral
ammonium sulfite process is optimally selected as the
ammonia water, and optimally, the condensate water with 0.05-0.55% of
nitrogen content and at the temperatureof 25-70 DEG C is the best; and by-products generated in preparation department in the neutral
ammonium sulfite process are optimally selected as the
crop by-products. The method re-uses the waste and waste liquid which are generated in the neutral
ammonium sulfite process to turn waste into wealth. The permeability and
nutrient content of the medium are respectively superior to that of
peat perlite, when the medium is used in the growth test of nursery stock of forest, the nursery stock has obvious grow, and the quantity of the
root system can be increased by over 30 percent.