Rhizosphere regulating agent for increasing phytoremediation efficiency and application thereof

A technology of phytoremediation and regulators, applied in the direction of application, fertilizer mixture, other chemical processes, etc., to achieve the effect of good stability, strong ability, and simple and convenient application method

Inactive Publication Date: 2012-12-19
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, there is no report on the phytoremediation of cadmium-contaminated soil on the field using weathered coal nitrohumic acid

Method used

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  • Rhizosphere regulating agent for increasing phytoremediation efficiency and application thereof
  • Rhizosphere regulating agent for increasing phytoremediation efficiency and application thereof
  • Rhizosphere regulating agent for increasing phytoremediation efficiency and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation and effect of embodiment 1 regulating agent

[0032] Preparation of rhizosphere regulating agent: add 4900ml of 33% nitric acid to 10kg of weathered coal, stir for 30min, place at room temperature, air-dry into lumps, and crush to obtain weathered coal nitrohumic acid. Take weathered coal nitro humic acid 5kg, urea 1kg, KH 2 PO 4 Mix 0.8kg and KCl 0.8kg evenly.

[0033] The method of application is basal application. The application time is to mix the rhizosphere regulator with the soil evenly before sowing rapeseed, and then sow after stabilizing for a week.

[0034] Application method: The soil used is high cadmium and low cadmium polluted soil, and the total cadmium concentration is 1.5mg·kg respectively -1 and 1.0mg·kg -1 , the rapeseed variety used is Zhu Canghuazi, a high-accumulation cadmium rapeseed variety, and the rhizosphere regulating agent is 1.52g·kg -1 Soil (field application rate: 450kg / ha) was applied horizontally, and the plants grew...

Embodiment 2

[0038] Preparation and effect of embodiment 2 regulating agent

[0039] Preparation of rhizosphere regulating agent: Add 5100ml of 45% nitric acid to 10kg of weathered coal, stir for 20min, place at room temperature, wait for air-drying to form lumps, and crush to obtain weathered coal nitrohumic acid. Take 5.2kg of weathered coal nitro humic acid, 1.4kg of ammonium sulfate, 1kg of ammonium phosphate and 1kg of potassium sulfate, and mix them evenly to get the product.

[0040] The method of application is basal application. The application time is to mix the rhizosphere regulator with the soil evenly before sowing rapeseed, and then sow after stabilizing for a week.

[0041] Application method: The soil used is high cadmium and low cadmium polluted soil, and the total cadmium concentration is 1.5mg·kg respectively -1 and 1.0mg·kg -1 , the rapeseed variety used is Zhu Canghuazi, a high-accumulation cadmium rapeseed variety, and the rhizosphere regulating agent is 1.52g·kg -1...

Embodiment 3

[0045] Embodiment 3 regulating agent preparation and time effect

[0046] The rhizosphere regulating agent is prepared with embodiment 1.

[0047] Application method: the same as in Example 1, except that the soil used is the soil polluted with high cadmium and low cadmium in Example 1 and then planted with a crop of rapeseed. The results are shown in Table 3.

[0048] Table 3 Regulator application effect table

[0049]

[0050] The test results showed that after the rhizosphere regulator was applied on the high cadmium-contaminated soil, the soil pH value of the rapeseed was lowered by 0.05 pH units compared with the control, and the repair efficiency of the rapeseed with the rhizosphere regulator was 34.1% higher than that of the control; the low-cadmium-contaminated soil After applying the rhizosphere regulating agent, the soil pH value of rapeseed at harvest was 0.11 pH units lower than that of the control, and the restoration efficiency of rapeseed applied with the r...

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Abstract

The invention relates to a rhizosphere regulating agent for increasing phytoremediation efficiency and an application thereof. The rhizosphere regulating agent comprises weathered coal nitro-humic acid, a nitrogen fertilizer, a phosphate fertilizer and a potash fertilizer in the weight ratio of (25-26):(5-7):(4-5):(4-5). The pH value of soil is lowered through the rhizosphere regulating agent, and cadmium in soil is complexed and chelated, so that the bioavailability of the cadmium in the soil is increased, the aim of increasing the phytoremediation efficiency in soil of cadmium-polluted farmlands is fulfilled, and environmental pollution is prevented; and the rhizosphere regulating agent is suitable for commercial application and large-scale demonstration and popularization.

Description

technical field [0001] The invention relates to a rhizosphere regulating agent, in particular to a rhizosphere regulating agent for improving phytoremediation efficiency and application thereof. Background technique [0002] Environmental issues have become more and more concerned about the world today. In recent years, with the acceleration of industrialization and urbanization, heavy metal-containing sewage irrigation, sludge utilization, excessive application of fertilizers, vehicle exhaust emissions, and mining have led to a large number of heavy metal elements entering the soil, water and atmosphere. , causing heavy metal pollution in my country's farmland soil is becoming more and more serious, especially the heavy metal cadmium easily enters the food chain through the soil-crop system, thus threatening human health. [0003] The current treatment methods for heavy metal pollution include solidification, vitrification, heat treatment, soil leaching, and electrodynamic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/14C09K101/00C09K109/00
Inventor 李花粉于玲玲朱俊艳苏德纯江荣风
Owner CHINA AGRI UNIV
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