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Method for remedying soil polluted with cadmium by using interplanting

A technology for remediation of soil and cadmium pollution, applied in the fields of botanical equipment and methods, application, horticulture, etc., can solve the problems of small biomass, unsatisfactory remediation effect, slow growth, etc.

Active Publication Date: 2011-08-10
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-accumulation plants commonly used in phytoremediation often have small biomass and slow growth, and the remediation effect is not ideal.

Method used

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  • Method for remedying soil polluted with cadmium by using interplanting
  • Method for remedying soil polluted with cadmium by using interplanting
  • Method for remedying soil polluted with cadmium by using interplanting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: Cadmium accumulation effect of co-planting green vegetables and cabbage in pot experiments

[0021] CdSO 4 ·8H 2 O is evenly mixed into the dry and sieved soil to make the cadmium content of the soil reach 3mg / Kg, and it is placed for 1 month to make the heavy metals evenly distributed, during which the whole is turned every five days.

[0022] According to the preliminary experimental screening, the cabbage variety Hangzhou Youdonger is a relatively high-accumulating variety of cadmium, and the cabbage variety Jingfeng No. 1 is a relatively low-accumulating variety of cadmium. In plastic square pots of 40x20x20cm, 20Kg of cadmium-contaminated soil was added to each pot. There are three planting modes: Hangzhou Youdong'er single cropping, Jingfeng No. 1 single cropping, and intercropping of two kinds of vegetables. For single cropping, 6 vegetables are planted in each pot, and for intercropping, 3 vegetables are planted in each pot.

[0023] The seeds ...

Embodiment 2

[0025] Example 2: The cadmium accumulation effect of planting Hangzhou Youdonger and Jingfeng No. 1 in large field cropping

[0026] The experiment was carried out in Baimutan Village, Zeguo, Wenling, where the soil cadmium content was 0.83mg / Kg (three-level pollution level). Set up a 2x5m square plot, and plant Hangzhou Youdonger, Jingfeng No. 1 and intercropping between the two.

[0027] They were bred in late March 2009 and moved into the field in mid-April. During planting, 3 rows of vegetables were planted in each plot with a plant spacing of 30 cm, and the intercropping plots Hangzhou Youdonger and Jingfeng No. 1 were planted at intervals. Harvest in July, randomly harvest 5 plants per plot. The harvested vegetables were washed with deionized water, wiped dry, divided into aboveground part and underground part, weighed fresh respectively, dried at 70°C until constant weight, and weighed dry. Crushed, digested, and measured for cadmium content.

[0028] Compared with ...

Embodiment 3

[0029] Embodiment 3: The cadmium accumulation effect of planting Corngrass and corn in large field

[0030] Experimental place, mode are the same as embodiment two.

[0031] Compared with single cropping, the Cd accumulation in the lower part of the high-accumulation corngrass increased significantly in the intercropping group, while the whole plant of the low-accumulation corn decreased ( Figure 4 ). There was no significant difference between monocropping and intercropping of corn fruit, all of which were lower than the national food safety standard, but the decrease of cadmium content in corn plants helped to improve the safety of food corn. Intercropping improved the accumulation ability of cadmium in high cadmium accumulating varieties, and reduced the accumulation of cadmium in low accumulating varieties.

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Abstract

The invention provides a method for remedying soil polluted with cadmium by using interplanting. In the soil polluted with cadmium, cadmium high-accumulation plants and cadmium low-accumulation plants are planted simultaneously in an interplanting manner and planted alternatively at the number ratio of 1 to 1; four plants around each plant are all different from the plant in variety, the plant spacing is 10 to 30 cm and the line spacing is 10 to 30 cm; the plants are watered by using a water source without being polluted by heavy metal and the field moisture capacity of the soil is kept to be 80%; compound fertilizers and carbamide are applied, depending on the soil property and the crop variety; edible parts of the interplanted plants are harvested at the harvest time and the cadmium content in the plant variety with relative low cadmium accumulation is decreased to the specified safe standards for consumption in China, so that the purpose of yielding safe edible products from the soil polluted with cadmium is achieved. The method for remedying soil polluted with cadmium by using interplanting, provided by the invention, has the advantages of rational design, low expense and strong operability and can be applied to the purpose of yielding products at the same time of remedying the soil polluted cadmium.

Description

technical field [0001] The invention relates to the food safety of crops under polluted environment, in particular to a method for producing safe edible products by using two kinds of plants to grow together. Background technique [0002] With the rapid advancement of industrialization and the rapid development of modernization, a large number of mineral resources have been developed and utilized, various chemical products, such as pesticides, fertilizers, etc., have been widely used, industrial and agricultural production and urban and rural domestic pollutants are discharged. The pollution of heavy metals in water is becoming more and more serious. my country is a major producer of grain and vegetables. A large amount of data and data show that more and more areas of our country have vegetable planting soils and more than 10% of the cultivated land are polluted by heavy metals to varying degrees. When crops are planted in these soils, heavy metals are absorbed, accumulate...

Claims

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Application Information

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IPC IPC(8): A01G1/00
Inventor 朱诚安玲瑶赵丽
Owner CHINA JILIANG UNIV
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