The invention relates to an
active carbon preparing method by adopting walnut shell as
raw material and an application of the
active carbon. The walnut shell is adopted as the
raw material. The
active carbon is prepared by adoption of a vacuum
pyrolysis method through steps of smashing,
drying,
charring, puffing for activation, cooling, discharging, sieving, and the like. The obtained active carbon is applied as a microbial
fertilizer carrier. The preparing method and the application are advantaged by: short production period, low
reaction temperature, low production cost, low
energy consumption, no
pollution to the environment, and capability of improving the soil granular structure, reducing soil hardening, enhancing the
water retention property of the soil, playing a role of
nitrogen-fixation
controlled release fertilizers, and reducing the using amount of fertilizers and decomposed
crop straw when the active carbon is applied as a microbial
fertilizer carrier and used in the
agriculture.