Cadmium-lead compound polluted farmland restoration agent and preparation method thereof

Abstract

The invention discloses a cadmium-lead compound polluted farmland restoration agent and a preparation method thereof. The restoration agent comprises the following components and parts by weight: 5-20 parts of AM fungi, 20-40 parts of iron-manganese oxide; 45 ~90 parts of biochar. This restoration agent can not only restore cadmium and lead compound polluted soil, but also effectively reduce the content of cadmium and lead in agricultural products; the synergistic promotion between biochar, iron manganese oxide and AM fungus in this restoration agent fixes lead-cadmium Simultaneously, the increase of plant biomass is promoted; the restoration agent has stable effect, simple preparation method and low cost, and is suitable for popularization and use of cadmium and lead polluted soil in large areas.

Description

technical field

[0001] The invention relates to the technical field of agricultural environment conservation and restoration, in particular to a cadmium-lead compound polluted farmland restoration agent and a preparation method thereof. Background technique

[0002] Soil environmental pollution in some areas of my country is relatively serious. Soil pollution is usually dominated by a certain pollutant, and other pollutants exist at the same time, that is, the problem of compound pollution. According to reports, the area of ​​cultivated land polluted by heavy metals such as Cd, As, Cr, and Pb in my country is nearly 25 million hm 2 , accounting for about 1 / 5 of the total cultivated land area. Among them, cadmium-lead compound pollution, which is mainly cadmium pollution, seriously endangers the grain production and quality safety of major grain producing areas such as Hunan in my country. Therefore, soil cadmium-lead compound pollution has become an important environmental ...