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Method for improving cadmium-contaminated soil remediation capacity by hybrid pennisetum alopecuroides

A technology for hybridizing Pennisetum and cadmium-contaminated soil, applied in the field of soil remediation, can solve problems such as changing the soil environment, and achieve the effects of large biomass, strong cadmium enrichment ability, and large remediation potential

Inactive Publication Date: 2021-03-30
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But adding root exudates to the soil changes the soil environment

Method used

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  • Method for improving cadmium-contaminated soil remediation capacity by hybrid pennisetum alopecuroides
  • Method for improving cadmium-contaminated soil remediation capacity by hybrid pennisetum alopecuroides
  • Method for improving cadmium-contaminated soil remediation capacity by hybrid pennisetum alopecuroides

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. On March 15, 2019, the "Ningza No. 4" pennisetum seedlings with 4 true leaves were transplanted into cadmium-contaminated soil with a cadmium concentration of 700-750 mg / kg.

[0029] 2. After the hybrid pennisetum seedlings grow stably, spray a humic acid aqueous solution with a concentration of 2000mg / L on the leaves. Spray once a week at 7:30.

[0030] 3. After the hybrid pennisetum plant height reaches 1.2m, mow, apply urea to the hybrid pennisetum after mowing, and the addition amount is 900kg·hm -2 .

[0031] 4. After the hybrid Pennisetum grows 4 true leaves, repeat steps 2 and 3 until the remediation of cadmium-contaminated soil is completed.

Embodiment 2

[0033] 1. On March 15, 2019, "Ningza No. 4" pennisetum seedlings with 3 true leaves were transplanted into cadmium-contaminated soil with a cadmium concentration of 300-400 mg / kg.

[0034] 2. After the hybrid pennisetum seedlings grow stably, spray a humic acid aqueous solution with a concentration of 1000mg / L on the leaves. Spray once a week at 5:30.

[0035] 3. After the hybrid Pennisetum plant height reaches 1.2m, mow, apply urea to the hybrid Pennisetum after mowing, and the addition amount is 750kg·hm -2 .

[0036] 4. After the hybrid Pennisetum grows 3 true leaves, repeat steps 2 and 3 until the remediation of cadmium-contaminated soil is completed.

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Abstract

The invention discloses a method for improving cadmium-contaminated soil remediation capacity by hybrid pennisetum alopecuroides. The method comprises the following steps: transplanting hybrid pennisetum alopecuroides seedlings into cadmium-contaminated soil; after the hybrid pennisetum alopecuroides seedlings grow stably, spraying a humic acid aqueous solution to leaf surfaces of the hybrid pennisetum alopecuroides seedlings; after the plant height of the hybrid pennisetum alopecuroides reaches 1.2 m, carrying out cutting, and applying nitrogenous fertilizer to the hybrid pennisetum alopecuroides after cutting; and after new leaves grow from the hybrid pennisetum alopecuroides, repeating the operations until the remediation of the cadmium-contaminated soil is completed. according to the method, the hybrid pennisetum alopecuroides is selected as a cadmium-contaminated soil remediation plant and can be cut repeatedly in one year, and the cadmium enrichment capacity is high. The foliagespraying agent provided by the invention takes humic acid as an effective component, is safe and non-toxic, and does not pollute soil, underground water and air; and by adopting a foliage spraying mode, the method is simple and convenient to operate and easy to master, the above-ground biomass of the hybrid pennisetum alopecuroides is increased, underground root growth is promoted, meanwhile, theabsorption and enrichment capacity of the hybrid pennisetum alopecuroides to cadmium can be effectively promoted, and the method is suitable for large-scale popularization and application.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a method for improving the remediation ability of hybrid pennisetum to cadmium-contaminated soil. Background technique [0002] A large number of automobile exhaust emissions, excessive mining and smelting of metal minerals, widespread use of sewage irrigation, excessive use of pesticides and chemical fertilizers, and sedimentation of polluted air have led to increasingly prominent problems of soil heavy metal pollution. The ecological environment and human health and safety have posed a huge threat. Cadmium is a common polluting heavy metal in soil, and it is also one of the most polluted, biologically toxic and harmful heavy metals in my country's soil. Cadmium pollution has the characteristics of concealment, irreversibility, long-term and carcinogenicity. It can be enriched in a large amount in the human body through the food chain, thereby affecting human health an...

Claims

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Application Information

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IPC IPC(8): A01B79/02A01C21/00A01G20/00B09C1/00
CPCA01B79/02A01C21/005A01G20/00B09C1/00
Inventor 宋希亮陈为峰刘晓丽姜慧新周虎张国平
Owner SHANDONG AGRICULTURAL UNIVERSITY
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