The invention discloses a citrus specialized slow release
fertilizer using
biomass granular carbon as a substrate and a preparation method of the citrus specialized slow release
fertilizer. The granular carbon prepared by waste
agricultural biomass of corn cobs, peanut shells,
rice hulls,
edible mushroom substrates and the like is used as a substrate material, and the granular carbon which is microporous and high in adsorption capacity is compounded with
nitrogen, phosphori,
potassium and other
nutrient elements which are required for growth and development of citruses to be prepared into the granular
biomass carbon based citrus specialized slow release
fertilizer. According to the citrus specialized slow release fertilizer, the used
biomass granular carbon is black biomass granular carbon granules formed by incomplete
combustion of the waste
agricultural biomass under the
low oxygen condition, and the biomass granular carbon has multiple characteristics similar to
soil humus and is high in capability of absorbing and keeping
nutrient and water, good in slow release performances of
nitrogen phosphorus kalium and capable of stimulating
crop growth. The prepared release fertilizer is applied for one time and can efficiently provide
nutrient for the citruses during a whole growing period, besides, the citrus specialized slow release fertilizer has the advantages of being capable of increasing
soil fertility, improving
soil structure, effective and environment-friendly, and large-scale popularization and application during production of the citruses are facilitated.