Carbon-based controlled-release fertilizer special for potato and preparation method thereof

The invention relates to the field of agricultural chemistry, in particular relates to a carbon-based controlled-release fertilizer special for potato and a preparation method thereof. The environment-friendly efficient carbon-based controlled-release fertilizer special for the potato is a long-acting granular-carbon-based compound fertilizer which is prepared from waste agriculture and forestry biomasses such as corn core, peanut shell, rice shell, edible fungi substrate and the like, wherein the biological granular carbon is black carbon powder granules (carbon black) which is formed by imperfect combustion of biomasses under anaerobic condition and has various features similar to those of soil humus (acid); and the biological granular carbon has strong capabilities of absorbing and retaining nutrition and moisture, can stimulate growth of crops and has good controlled-release effect on NPK, thus the prepared controlled-release fertilizer only needs to be applied once in the full growth and development period of potatoes, has the characteristics of increasing soil fertility, improving soil structure and the like, is efficient and environment-friendly, and has a wide application prospect.