The invention discloses a biological
organic fertilizer with an
insect expelling function and a preparation method thereof. The
fertilizer comprises the following components: tobacco waste, 1 to 2 percent of
calcium-
magnesium phosphate, 1 to 2 percent of
ammonium sulfate, 3 to 5 percent of waste molasses and 0.3 to 0.5 percent of zymocyte based on the total weight of the tobacco waste; and the zymocyte comprises 20 to 35 weight percent of
trichoderma viride, 20 to 35 weight percent of
bacillus subtilis, 10 to 20 weight percent of
rhizopus oryzae, 10 to 20 weight percent of
chaetomium and 10 to 20 weight percent of thermomonospora fusca. The preparation method comprises the following steps of: pretreating the tobacco waste; smashing tobacco waste raw materials into
sawdust-like grains of 40 to 60 meshes; then adjusting the carbon-to-
nitrogen ratio of the raw materials to 20 to 30:1 with grass
peat or
straw powder; and then adjusting the pH value to 6.5 to 7.5 with Ga(OH)2 and the
water content to 40 to 50 weight percent. Due to the adoption of the biological
organic fertilizer with the
insect expelling function,
nicotine in the raw materials can be preserved to the greatest extent,
insect damage degree is lowered, the using amount and times of agricultural chemicals are reduced, the application of the agricultural chemicals is effectively reduced, and the production is
environmentally friendly.