A method for maintaining crop trace element supply after farmland cadmium pollution passivation treatment

Abstract

The invention discloses a method for maintaining crop trace element supply after farmland cadmium pollution passivation treatment. It uses wollastonite to passivate the cadmium-contaminated soil in the farmland under the condition of maintaining the water content of the cadmium-contaminated soil in the field at the level of the field water holding capacity. The content level of available trace elements in the soil after limestone failure, evaluate the degree of passivation of trace elements, and classify according to the Chinese agricultural soil trace element classification standards, and then calculate the amount of supplementary trace elements according to the conventional application level of trace elements; Form Apply trace element fertilizer to the soil after the passivation material wollastonite has expired, supplement trace elements, so that the supply of trace elements in the soil can reach or exceed the normal soil level. Utilizing the invention can make the crops planted on the passivated farmland absorb the normal level of trace elements to ensure the yield and quality of the crops.

Description

[0001] Technical field: [0002] The invention belongs to the field of farmland cadmium pollution control, and in particular relates to a method for maintaining crop trace element supply after farmland cadmium pollution passivation treatment. [0003] Background technique: [0004] For the vast area of ​​cadmium-contaminated farmland in my country, a feasible treatment technology solution is soil heavy metal passivation (Yin Fei et al. 2015), which is to add passivation materials to the soil to significantly reduce the activity of heavy metals, making it difficult for crops to absorb, thus producing qualified of agricultural products. The application prospect of heavy metal passivation technology in farmland soil is very broad. It has many advantages. First, it does not affect agricultural production and can be used in the cultivation process. Second, the cost is low. Some passivation materials have obvious effects of increasing production and income. It is very easy to promote...

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Problems solved by technology

In response to this problem, no one else has proposed a corresponding solution. The first reason is that most researches only focus on the passivation effect itself, take an evasive attitude towards the problem of crop yield decline, and discard passivation materials that cause yield decline. Turning to the search for other materials, many papers on passivation do not even mention the issue of crop yield decline (Li Jianrui 2014). Second, most studies do not have a comprehensive understanding of the reasons for passivation to cause crop yield decline, so that they cannot propose countermeasures

Therefore, there is currently no response technology for the decrease in crop yield caused by passivation treatment, and there are no relevant reports or available patents

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