Preparation method of biological carbon fertilizer and application in passivating heavy metal in soil

Abstract

The invention discloses a preparation method of a biological carbon fertilizer. The preparation method comprises the following steps of 1, using biological carbon, nitric acid and ammonia water to prepare a reaction product A; 2, fully stirring and uniformly mixing the reaction product A, a phosphate fertilizer, azotobacter, plant vinegar liquid, waste molasses and a fertilizer additive; 3, granulating; 4, uniformly mixing humic acid powder, bentonite, calcium oxide and diatomite, so as to obtain a material B; 5, coating by a slow-release coating material, so as to obtain a particle B; 6, using the material B to perform fertilizer coating on the particle B, so as to obtain a particle C; 7, further drying the prepared particle C. The preparation method has the beneficial effects that before crop is planted, the fertilizer is applied onto the soil surface, the fertilizer with ploughing type fertilizer surface layer acts onto the soil, the surface fertilizer contains the humic acid, and the inner layer is a coated biological carbon-based slow-release fertilizer; the fertilizer is reasonably applied, the fertility of the soil is improved, and the heavy metal and other pollutants are effectively prevented from entering the food chain.

Description

technical field [0001] The invention mainly relates to the technical field of chemical fertilizers, in particular to a preparation method of biochar fertilizer and its application in passivating heavy metals in soil. Background technique [0002] With the rapid development of industry and agriculture, the phenomenon of heavy metal pollution in soil and excessive use of fertilizers have become common. Heavy metals in soil can be absorbed by the human body indirectly through "soil→plant→human body", which will damage the health of the body. In addition, excessive use of fertilizers, It leads to soil compaction and acidification. After soil acidification, it is beneficial for heavy metals to exist in the soil in the form of ions, which further aggravates the absorption of heavy metals by plants. Therefore, remediation of heavy metal pollution in soil has received more and more attention. The best soil remediation method is to maintain the ecological function of the soil, to mai...

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Problems solved by technology

The best soil remediation method is to maintain the ecological function of the soil, to maintain or even improve the fertility of the soil through reasonable fertilization, and to effectively prevent and control pollutants such as heavy metals from entering the food chain. For the purpose of repairing heavy metal polluted cultivated land while producing, the general fertilizers are quick-acting fertilizers or slow-release fertilizers. Quick-acting fertilizers can quickly combine with the soil to passivate heavy metals in the soil, but they dissolve quickly in the soil, release quickly, and have a short validity period. Unable to provide lasting fertility to the soil, topdressing is required during crop growth, which can easily lead to excessive use of fertilizers; slow-release fertilizers can effectively reduce the loss of fertilizer nutrients, especially nitrogen, in the soil, reduce the number of fertilization operations, and save labor and costs , to effectively avoid damage to seeds or seedlings caused by excessive fertilization, but due to its slow release, the passivation effect on heavy metals in the soil is greatly weakened

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