Soil improvement nutrient solution for reducing heavy metal cadmium content of vegetables

Abstract

The invention belongs to the technical field of agriculture, in particular to soil improvement nutrient solution for reducing the heavy metal cadmium content of vegetables. The nutrient solution is prepared by dissolving and filtering humic acid salt, urea, monopotassium phosphate, strong base and water. The humic acid salt is one or a mixture of humic acid sodium and humic acid kalium; and the strong base is one or a mixture of sodium hydroxide and potassium hydroxide. The nutrient solution has a simple process and low cost; a buffer solution system is formed by using chemical reaction amongcomponents of a formula; nutrient elements and active substance required for crop growth are compounded, and nutrients required for the crop growth are provided when the pH value of soil is effectively regulated and controlled; the nutrient solution can be used for irrigating the soil at any time before crop planting or in the process of the crop growth; and the nutrient solution has the characteristics of convenient use, safety and the like.

Description

technical field [0001] The invention belongs to the technical field of agriculture, and in particular relates to a soil improvement nutrient solution for reducing the content of heavy metal cadmium in vegetables. Background technique [0002] Cadmium element (Cd) is a toxic and harmful heavy metal element. After being absorbed by the human body, it mainly combines with low molecular weight plasma proteins containing sulfhydryl groups to form metallothioproteins, which are selectively stored in the liver, kidney, spleen, pancreas, and thyroid along with the blood. , adrenal glands and testes, and the accumulation is very strong. Long-term absorption or excessive absorption of cadmium by the human body can lead to bone pain and a series of chronic damages, such as high blood pressure, testicular damage, carcinogenicity, teratogenicity, anemia, osteoporosis and so on. [0003] Cadmium is a control indicator for pollution-free vegetable agricultural products (GB18406.1-2001). ...

AI Technical Summary

Problems solved by technology

[0005] (1) Inconvenient to use

The traditional method of soil improvement is to apply solid soil conditioner at one time when leveling the cultivated land before planting. At this time, it is not easy to measure the application amount and apply it evenly.

[0006] (2) The growth process of crops requires constant topdressing. With the increase of the amount of fertilizer applied, the soil pH value also changes at any time. At this time, it is difficult to use traditional solid soil amendments to adjust the soil pH value.

[0007] (3) Traditional solid soil amendments have single components and functions, and cannot improve soil fertility while regulating soil acidity

[0008] (4) Traditional solid soil amendments contain a large amount of calcium salts, which form insoluble compounds after chemical reactions with applied chemical fertilizers, causing soil compaction and affecting fertilizer efficiency

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