The invention discloses phosphorus-rich biomass pyrolytic carbon capable of controllably releasing available phosphorus and a preparation method and an application thereof. The method comprises the following steps: (1) drying and crushing phosphorus-rich biomass shrimp shells to obtain shrimp shell powder; and (2) heating the shrimp shell powder obtained in the step (1) to 200-850 DEG C in a protective gas atmosphere, carrying out heat preservation for 2 hours for carbonization, cooling the shrimp shell to room temperature, sieving the product and collecting the particles less than 600 [mu]m in size, thereby obtaining the phosphorus-rich biomass pyrolytic carbon capable of controllably releasing available phosphorus. The phosphorus-rich biomass pyrolytic carbon can effectively promote thecontrolled release of available phosphorus without ultramicro particles, and reduces the power consumption required for preparing high-temperature pyrolytic biomass carbon and the economic cost for grinding the ultramicro particles. The product can increase the crop yield and promote the crop growth by improving the bioavailability of the phosphorus element in the soil.

Phosphorus-rich biomass pyrolytic carbon capable of controllably releasing available phosphorus and preparation method and application thereof

The invention discloses a preparation method for a biochar-based compound fertilizer with a high slow release performance. The preparation method specifically comprises the following steps: firstly, charring dried rice hull and camellia shell in a high-temperature continuous pyrolysis device at heating rate of 7-15 DEG C/min; mixing biochar, urea and dipotassium phosphate at a certain ratio, thereby acquiring a solid raw material; spraying a liquid starch adhesive onto the solid raw material as per dosage of 0.38-0.47mL/g; pelletizing and drying, thereby acquiring a slow-release granular biochar-based compound fertilizer. The molding ratio of the slow-release biochar-based compound fertilizer prepared according to the method can reach up to 98%, the granule strength can reach up to 2.98N and a slow-release effect is excellent. According to the invention, biochar is inputted to a farmland in the form of granular fertilizer, so that a function of improving soil structure and soil fertility can be achieved, the manner of returning powdered biochar to field is optimized and application and promotion of biochar in farmland can be benefited.

Preparation method for biochar-based compound fertilizer with high slow release performance

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Preparation method for biochar-based compound fertilizer with high slow release performance