Compound fertilizer capable of restoring soil and reducing crop cadmium absorption and application

Abstract

The present invention discloses a compound fertilizer capable of restoring soil and reducing crop cadmium absorption, and the compound fertilizer comprises the following raw materials by weight: 15% to 40% of a nitrogen raw material, 5-10% of a phosphorus raw material, 8-20% of a potassium raw material, 15%-30% of calcium magnesium phosphorus fertilizer, 6%-35% of charcoal activated carbon, 2%-3% of bentonite, 1%-3% of potassium humate, 1%-3% of solid silicate and 1%-2% of borax. The present invention also provides the application of the fertilizer in crops. Through combination of fertilizer preparations and absorbent materials, the compound fertilizer can absorb heavy metals, and also can absorb nutrients, protect fertilizer, restore soil and increase fertilizer use efficiency by 10%; after administration, the crop Cd content can be effectively reduced, and the reducing rate is about 30%-50%, heavy metal Cd adsorption fixing time period can be maintained at about 3-6 months, and the compound fertilizer has a wide use range, and is worthy of promoting.

Description

technical field [0001] The invention belongs to the technical field of fertilizers, and in particular relates to a compound fertilizer capable of repairing soil and reducing the absorption of heavy metal cadmium by crops and the application of the compound fertilizer in crops. Background technique [0002] Soil remediation refers to the use of physical, chemical and biological methods to transfer, absorb, degrade and transform pollutants in the soil, reducing its concentration to an acceptable level, or converting toxic and harmful pollutants into harmless substances. Contaminated soil remediation generally includes: (1) changing the form of pollutants in the soil or combining with the soil, reducing their mobility and bioavailability in the environment; (2) reducing the concentration of harmful substances in the soil . As a country with a very high population density, nearly one-fifth of the existing cultivated land in China has been polluted to varying degrees, especially...

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Problems solved by technology

[0011] (1) Only applicable to situations where the content of heavy metal Cd in polluted soil is low (generally, the total content of Cd in soil is <0.6ppm);

[0012] (2) The nutrient content of nitrogen, phosphorus and potassium is low and can only be used in the early stage of crop cultivation;

[0013] (3) The application method is complicated and needs to be mixed with the planting soil

[0014] (4) The barrier rate of crops to absorb heavy metal Cd is low, and it is difficult to reach below the edible safety limit

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