Preparation method and application method of biological organic fertilizer capable of alleviating soil cadmium pollution

Abstract

The invention relates to a preparation method and an application method of a biological organic fertilizer capable of alleviating soil cadmium pollution. The preparation method of the biological organic fertilizer comprises the following steps: heating phosphoric acid, adding into a reaction kettle, then adding ammonium sulfate and ammonium molybdate into the reaction kettle, stirring, and dissolving; adding sodium nitrate and potassium phosphate into the reaction kettle, and carrying out complexing reaction; dissolving a biological inoculant and reactants into water, uniformly mixing in a stirring machine, and then drying and crystallizing, so that biological bacterial fertilizer granules are obtained; putting abamectin, sugarcane powder, sepiolite, sweet potato powder, alligator alternanthera powder, honeysuckle straw powder, beet powder, phoenix tree leaf powder and the biological bacterial fertilizer granules into a fermentation tank, and fermenting; and then drying and crystallizing products, sealing with bags, and carrying out low temperature preservation, so that the biological organic fertilizer is obtained. The biological organic fertilizer has the advantages that by adopting the mode that microbial communities are attached on an organic matrix dissolved in water, necessary nutrients for growth of the microbial communities can be guaranteed, and loss of activity of the microbial communities because the microbial communities directly contact with an inorganic fertilizer is avoided.

Description

technical field [0001] The invention relates to a bio-organic fertilizer, in particular to a method for preparing and applying a bio-organic fertilizer for improving soil cadmium pollution, and belongs to the field of agricultural technology. Background technique [0002] The heavy metals in the soil mainly come from the soil parent material and human activities. Human activities mainly include waste water, gas and waste residues discharged by industrial and mining enterprises, sewage irrigation, and the extensive use of pesticides and chemical fertilizers. [0003] The toxicity of heavy metals in soil to plants and the degree of pollution to the environment are related to the content of heavy metals in the soil on the one hand, and the forms of heavy metals in the soil on the other hand. Heavy metals exist in different forms in soil, and their bioavailability also varies greatly. The bioavailability of heavy metals in soil mainly depends on the content of available state o...

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Problems solved by technology

[0006] However, there are disadvantages in the mixed application of biochar and biofertilizer: firstly, the release and absorption of fertilizer will be affected after the mixture of biochar and biofertilizer, which reduces the utilization rate; secondly, the service life of biochar is short, and it needs to be Replacement is not only troublesome in actual operation, but also easy to carry away biological fertilizers; in addition, the use of biochar can easily lead to hardening of the soil, making it difficult to recycle

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