Tagetes erecta replacement planting restoration method for cadmium and lead polluted cultivated land

A remediation method and marigold technology, applied in the restoration of polluted soil and other directions, can solve the problems of difficult to ensure the safety of agricultural products and human health hazards, so as to increase the biomass of marigold and chrysanthemum production, avoid secondary pollution and grow. short cycle effect

Pending Publication Date: 2021-12-28
YUNNAN AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because plants may accumulate heavy metals and other pollutants during the growth process, human beings will continue to enrich the body after eating food containing heavy metals for a long time, which will cause great harm to human health, and it is difficult to ensure the safety of agricultural products by various measures

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A kind of cadmium lead polluted arable land marigold replacement planting restoration method, plant enrichment plant marigold after applying passivating agent biochar on the cadmium lead polluted soil, comprises the following steps:

[0032] S1, select good varieties:

[0033] Select marigolds with strong resistance to heavy metals and adapt to plateau climate growth, with a growth period of 150-180 days;

[0034] S2, soil preparation:

[0035] Apply compound fertilizer or marigold special fertilizer according to the ratio of 600kg / mu, apply the biochar at the ratio of 45t / mu, plow and mix and spray sterilizer for sterilization; in the compound fertilizer, N:P:K=20 :8:12. The special fertilizer for marigolds is Amdan No. 2, which was purchased from Zhengzhou Apex Chemical Co., Ltd.

[0036] Biochar acts as a passivating agent. Biochar is made of corn stalks through high-temperature carbonization (total nitrogen 1.10g / kg, total phosphorus 1.83g / kg, total potassium 14....

Embodiment 2

[0046] Embodiment 2 effect test

[0047] 1. Test site setting:

[0048] The experimental site is located in the polluted farmland (26°22′06"N, 99°23′15"E) around the Fenghuangshan lead-zinc mining area, Jinding Town, Yunnan Province, with an altitude of 2224m, a low-latitude mountainous monsoon climate, and obvious dry and wet seasons. October is the rainy season.

[0049] The basic physical and chemical properties of the experimental soil: pH 6.60, the contents of alkaline nitrogen, available phosphorus, and available potassium are 91, 14.98, and 143.53 mg·kg, respectively -1 , the contents of total nitrogen, total phosphorus, total potassium, and organic matter are 2.52, 0.36, and 12.18 g·kg, respectively -1 and 32.5g·kg -1 , the lead content is 65.57mg·kg -1 , the cadmium content is 3.48mg·kg -1 (National Agricultural Land Soil Pollution Risk Control Standard GB15618-2018, Pb≤90mg / kg, GB15618-2018, Cd≤0.3mg / kg);

[0050] 2. Choose good varieties:

[0051] Select marigo...

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PUM

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Abstract

The invention discloses a Tagetes erecta replacement planting restoration method for cadmium and lead polluted cultivated land, wherein a passivator biochar is applied to cadmium and lead polluted soil, and non-edible crop Tagetes erecta is planted to replace crops on the cadmium and lead polluted soil. The method specifically comprises the following steps: selecting an improved variety; carrying out land preparation; planting Tagetes erecta; carrying out daily management; harvesting the Tagetes erecta; and evaluating the value and safety of the Tagetes erecta as the alternative plant, and the like. The method provided by the invention is low in cost, small in engineering quantity and free of secondary pollution, realizes safe and efficient utilization of heavy metal polluted farmland agriculture, and solves the problem that phytoremediation and economic development cannot be synchronized.

Description

technical field [0001] The invention relates to the technical field of alternative planting of cultivated land polluted by heavy metals, in particular to a repair method for alternative planting of marigolds in cultivated land polluted by cadmium and lead. Background technique [0002] China is a large agricultural country. In order to promote the development of agriculture, a large amount of pesticides, chemical fertilizers, plastic films and additives need to be applied every year. This process produces a large amount of sewage and other wastes. At the same time, various substances will carry a certain amount of heavy metals when they enter the soil environment. elements, thereby changing the soil environment. In addition, industrial activities such as metal and coal mining and energy development will produce a large amount of wastewater, waste gas and solid waste, which pollute the surrounding soil and water environment through dust reduction and open-pit mining. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10B09C1/08
CPCB09C1/105B09C1/08B09C2101/00
Inventor 湛方栋于子昊孙进博李博何永美陈建军祖艳群李元
Owner YUNNAN AGRICULTURAL UNIVERSITY
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