The invention discloses a compound
fertilizer with
nitrogen fertilizer slow release and biocontrol functions and a preparation method, and relates to the field of microbial compound fertilizers, and the compound
fertilizer comprises the following components: a
nitrogen source carrier, a physical netting material, 3, 4-dimethylpyrazole
phosphate, a biocontrol component and an
adhesive. The preparation method comprises the following steps: carrying out
silanization modification treatment on attapulgite, and mixing the attapulgite with a
polyglutamic acid aqueous solution for reaction to obtain self-assembled gel; the preparation method comprises the following steps: carrying out embedding treatment on
bacillus subtilis, pre-emulsifying
rhamnolipid, carrying out cross-linking treatment on
chitosan oligosaccharide by using
boric acid, and blending; heating the
nitrogen source carrier to be molten, adding the self-assembled gel, and uniformly mixing; controlling the temperature, adding 3, 4-dimethylpyrazole
phosphate, and carrying out heat preservation reaction; cooling, adding the blend obtained in the step S200 and an
adhesive, and uniformly mixing; and after
drying by a
fluidized bed, carrying out slow-release
coating to obtain the target compound fertilizer. According to the invention, the
disease control effect is improved to 89.2%, and the activity of the AMO
enzyme of nitrosomonas is blocked for 120 days.