An organic amendment capable of passivating copper, zinc and lead in vegetable soil

Abstract

The invention discloses an organic amendment capable of passivating Cu, Zn and Pb in soil of a vegetable field. The organic amendment is composed of the following components by mass percent: 10% to 50% of phosphate rock powder and 50% to 90% of wormcast. The organic amendment can be used for passivating heavy metals in contaminated soil, and especially used for passivating the Cu, the Zn and the Pb in the vegetable field soil which is moderately or slightly contaminated so as to decrease the content of the heavy metals in an acid extracting state, an oxidation state and other active states and increase the content of the heavy metals in an organic state, a residual state and other low active states, so that the content of the Cu, the Zn and the Pb in plants is obviously reduced, and a large quantity or an intermediate quantity of micronutrients required by the growth of the plants can be provided at the same time. Thus, the soil property is improved, the ecosystem health of the soil in the degraded vegetable field is restored, and the successive cropping obstacles of the soil are overcome. As a result, the yield and the quality of vegetables are improved.

Description

technical field [0001] The invention belongs to the technical field of soil improvers, and in particular relates to an organic improver capable of passivating Cu, Zn and Pb in vegetable soil. Background technique [0002] With the aggravation of industrial and urban pollution and the increase in the types and quantities of agricultural chemicals, heavy metals discharged from industry, agriculture and life are increasing, and soil heavy metal pollution is becoming more and more serious. In 2014, the Ministry of Environmental Protection issued the "National Soil Pollution Survey Bulletin". The overall soil environment situation in the country is not optimistic. The soil pollution in some areas is serious, the soil environment quality of cultivated land is worrying, and the soil environment problems of industrial and mining wasteland and vegetable fields in some urban suburbs are prominent. . The total point exceeding the standard rate of the national soil is 16.1%, of which t...

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Problems solved by technology

[0006] The present invention aims at the problem of slight pollution of heavy metals in vegetable soil in a large number of urban and suburban areas, and provides a method that can effectively passivate Cu, Zn, Pb in the soil and provide large, medium and trace elements needed for plant growth, improve soil structure and Biologically active organic improver, the present invention uses natural non-polluting heavy metal passivator phosphate rock powder, mixed with vermicompost that improves soil structure and provides various nutrients and active substances, and interacts synergistically to achieve passivation of soil heavy metals and improvement Dual Purpose of Soil, Promoting Plant Growth

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