Wheat straw biochar fertilizer able to reduce heavy metal harm and preparation method thereof

Abstract

The invention discloses a wheat straw biochar fertilizer able to reduce heavy metal harm and a preparation method thereof. The wheat straw biochar fertilizer is prepared from the following raw materials by weight part: 33-37 of guano, 25-27 of coconut shell powder, 2-3 of magnesium carbonate, 4-5 of calcium superphosphate, 2-3 of octamer sodium borate tetrahydrate, 25-30 of edible fungus residue, 10-14 of xylose powder, 80-100 of fresh enteromorpha, 6-7 of a compound microbial agent, 245-255 of wheat straw, 23-25 of fresh urine, and a proper amount of water. According to the invention, the use of xylose powder and coconut shell powder expands the porosity and specific surface area of charcoal fertilizer particles, various groups on the surface of the fertilizer and metal ions can undergo coordination and ion exchange reaction, and the fertilizer has strong adsorption capacity to heavy metals, plays a role of metal passivation, reduces the content of heavy metal exchangeable form in soil, thereby reducing the bio-availability of heavy metals, and providing guarantee for healthy growth of crops and product quality.

Description

technical field [0001] The invention relates to the technical field of fertilizers, in particular to a wheat straw biochar fertilizer which reduces the harm of heavy metals and a preparation method thereof. Background technique [0002] Biochar is an organic substance rich in stable carbon obtained by oxygen-limited pyrolysis and carbonization of biomass. Biochar can not only effectively increase the organic carbon content in the soil, but also gradually improve soil fertility and water retention. Soil nutrient loss and other aspects also have good effects. [0003] As the proportion of my country's agricultural products exports continues to increase, agriculture's requirements for fertilizers and soil fertility will continue to upgrade. Therefore, the use of biochar fertilizers from the perspective of changes in the types of soil fertilizers and fertility improvements will have a significant impact on the adjustment of my country's agricultural structure and the export of a...

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Problems solved by technology

[0004] However, due to the light weight of biochar, it is in the form of powder, takes up a lot of space, and the cost of transportation and storage is high. In addition, there are difficulties such as inconvenient application and dust pollution in the process of farmland application, which limits the agricultural promotion and utilization of biochar.