The invention discloses a composite biological carbon-based carrier with
pesticide slow release performance and preparation method and application. The composite biological carbon-based carrier is prepared from modified biological carbon, a
pesticide solution,
sodium carboxymethylcellulose and
bentonite. The preparation method comprises the following steps: A, washing rape stalks with water,
drying, treating, smashing, and screening for later use; C, performing
pyrolysis on the rape stalks at a certain temperature under the condition of limited
oxygen to obtain biological carbon, treating the biological carbon with
sodium hydroxide, washing with treated biological carbon with deionized water till the pH is constant,
drying in a
drying oven, and smashing to obtain the modified biological carbon; D, mixing the modified biological carbon with the
pesticide solution to obtain a suspension-loaded pesticide, stirring at
room temperature, uniformly mixing the
sodium carboxymethylcellulose with the
bentonite according to weight parts, aging for a certain time, and drying a
solid substance in an
air blast drying oven at a low temperature to obtain the composite carrier. The invention further relates to application of the composite carrier to rape cultivation. A composite controlled-release substrate does not generate any
side effect on soil, has high environment compatibility, and can prolong the
release time of the pesticide in soil.