Intercropping method for safely planting corn while remediating moderate-light cadmium polluted farmland

A cadmium-contaminated, farmland technology, applied in the field of soil heavy metal phytoremediation, can solve the problems of reducing the content of heavy metals, failing to meet national standards, and limited remediation capabilities

Active Publication Date: 2021-09-10
河南中米生态科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are also relevant reports on the technology of using other crops and Sedum sedum intercropping to restore heavy metal-contaminated land, such as the Chinese invention patent application CN101116865A "a method for repairing vegetable soil with moderate and moderate heavy metal pollution" using intercropping to plant Sedum sedum Tianhe Haizhou Sedum, by taking away a large amount of heavy metals from the soil through Sedum sedum, achieved good results in reducing the content of heavy metals in vegetables and ensuring the safety of agricultural products. The effect on corn intercropping is not ideal, the Cd content in corn is still high, which does not meet the national standard requirements, and the plant removal rate of Cd is not high, and the repair ability is very limited
There are also relevant reports on the technology of intercropping corn and Sedum sedum to restore heavy metal-contaminated land. Chinese invention patent application CN107790491A "A method for repairing cadmium-contaminated farmland by intercropping corn and Sedum sedum" uses intercropping to plant sedum and corn , by applying rapeseed root extract (need to be used with potassium sorbate and malic acid) to Sedum sedum to promote the absorption of heavy metal Cd, the test effect is good, but this test is only planted in greenhouses, and contains Cd The soil is artificially applied, and it is not directly planted on polluted farmland, so it is difficult to promote planting on a large scale

Method used

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  • Intercropping method for safely planting corn while remediating moderate-light cadmium polluted farmland
  • Intercropping method for safely planting corn while remediating moderate-light cadmium polluted farmland

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: a kind of intercropping method of safely planting corn while repairing in moderately light cadmium polluted farmland, its steps are as follows:

[0043] (1) From November 5th to 15th, 2019, weeding, application of basal fertilizer, plowing, soil preparation and ridging were carried out in sequence on the farmland of the selected test site, and barley seeds (Xiangpi No. 2) were sown into the soil to be repaired , the sowing rate is 12kg / mu, and the cultivation management is carried out;

[0044] (2) From April 1st to April 10th, 2020, during the vigorous growth period of barley (long-stem tillering period), the whole barley plant was pulled up, and the barley root exudates were collected and stored for later use. After the barley root exudates are collected, the barley plants are used for biogas fermentation;

[0045] Wherein, the extraction steps of barley root exudates are:

[0046] ①Take a fresh whole barley plant, clean the root, put 0.5mmol / L CaCl 2...

Embodiment 2

[0055] Embodiment 2: A kind of intercropping method for safely planting corn while repairing the moderate and mild cadmium polluted farmland, its steps are the same as in Example 1, the difference is that the barley root system in steps (5)~(6) in Example 2 Excretion irrigation amount is different, and 3 ridges (repeated 3 times) of embodiment 2 water the barley root exudates to the southeast Sedum sedum root, and the irrigation amount of the barley root exudates is 150mL per plant for the first time, and the barley root exudates for the second time The amount of irrigation is 250mL per plant.

[0056] The same method as in Example 1 was used to measure the content of heavy metal cadmium in the rhizosphere soil harvested in Example 2, Sedum sedum and corn respectively, and the results are shown in Table 5.

Embodiment 3

[0057] Embodiment 3: A kind of intercropping method of safely planting corn while repairing in medium and mild cadmium polluted farmland, its steps are the same as in Example 1, the difference lies in the barley root system in steps (5)~(6) in Example 3 The amount of exudate spreading is different, and 3 ridges of embodiment 2 (repeat 3 times) water the barley root exudate to the southeast Sedum sedum root, and the watering amount of the barley root exudate is 200mL per plant for the first time, and the barley root exudate for the second time The irrigation amount of plants is 300mL per plant.

[0058] The same method as in Example 1 was used to measure the content of heavy metal cadmium in the rhizosphere soil harvested in Example 3, Sedum sedum and corn respectively, and the results are shown in Table 5.

[0059] The irrigation amount of barley root exudates in Examples 1-3 is shown in Table 4.

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Abstract

The invention belongs to the technical field of soil heavy metal phytoremediation, and particularly relates to an intercropping method for safely planting corn while remediating a moderate-light cadmium polluted farmland. According to the method, an intercropping planting technology of sedum alfredii hance and important grain crop corn in China is applied to field experiments, and safe planting of the corn in the medium-light cadmium polluted farmland is achieved by spreading barley root exudates to the roots of the sedum alfredii hance. The method has the advantages of low investment, low management technical requirements, no damage to the physical and chemical properties of soil and no secondary pollution, and is a technology for simultaneous production and remediation of the farmland, which is wide in application range, low in investment and simple to operate.

Description

technical field [0001] The invention belongs to the technical field of phytoremediation of heavy metals in soil, and in particular relates to an intercropping method for safely planting corn while repairing moderately and lightly cadmium-polluted farmland. Background technique [0002] Farmland is an important part of the human ecological environment, the material basis for sustainable economic and social development, and one of the main natural resources on which human beings depend, directly related to the lives and health of the people. Since the 1990s, with the rapid development of industrialization, urbanization, and agricultural modernization, toxic heavy metals from various sources have entered the farmland environment in multiple forms, in multiple ways, and in multiple ways, such as water, gas (dust), slag, fertilizer, and medicine. , causing large areas of farmland to be polluted by heavy metals. Cd has strong accumulation and migration ability in farmland, and ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01B79/02A01G22/20B09C1/10
CPCA01B79/02A01G22/20B09C1/105
Inventor 袁海伟曾星刘红恩胡露
Owner 河南中米生态科技有限公司
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