Rice cadmium-lowering conditioner and rice cadmium lowering method

A conditioner and rice technology, applied in the field of cultivated land pollution control, can solve the problems of loss of production capacity of rice fields, impact on soil environment, high cost of biochar, etc., and achieve the effects of food safety and environmental protection, environmental friendliness and large reserves

Inactive Publication Date: 2019-08-23
SHENYANG AGRI UNIV +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the main methods to control large-scale cadmium pollution in my country are phytoremediation and chemical passivation. The former takes too long and the rice fields will temporarily lose production capacity, while the latter will have a relatively large impact on the soil environment.
The resource reuse of agricultural solid waste has become a research hotspot in recent years, and there are many studies on soil heavy metal remediation including soil cadmium pollution remediation. Biochar is a typical example, but biochar has the characteristics of high cost and difficult preparation. Good for mass promotion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1. Take the moderate cadmium polluted rice soil in Huizhou City, Guangdong Province as an example, and the specific implementation method is:

[0018] (1) The conditioning agent is prepared according to the parts by weight, 200 parts of mushroom dregs and 800 parts of shell powder, and stirred evenly for later use.

[0019] (2) In July 2018, the conditioner was applied to the base, and the application method was to spread the whole field, and the application rate was 150kg / mu. Controls received no conditioner.

[0020] The result is as follows:

[0021] deal with Rice cadmium content (mg / kg) conditioner 0.318 control 0.402

[0022] The results showed that the cadmium content of rice treated with conditioner was 0.318mg / kg, which was 20.90% lower than that of the control 0.402mg / kg.

Embodiment 2

[0023] Embodiment 2. Take the light cadmium polluted paddy soil of Huizhou City, Guangdong Province as an example, and the specific implementation method is:

[0024] (1) The conditioner is proportioned according to its parts by weight, 250 parts of mushroom dregs and 750 parts of shell powder, and stirred evenly for later use. In this embodiment, the mushroom dregs are preferably Pleurotus eryngii mushroom dregs, and the shell powder is preferably crushed scallop shells After passing through the 80-100 mesh sieve, the obtained powder.

[0025] (2) In July 2018, the conditioner was applied to the base, and the application method was to spread the whole field, and the application rate was 100kg / mu. Controls received no conditioner.

[0026] The result is as follows:

[0027] deal with Rice cadmium content (mg / kg) conditioner 0.094 control 0.229

[0028] The results showed that the cadmium content of rice treated with conditioner was 0.094mg / kg, whi...

Embodiment 3

[0029] Embodiment 3. Take the moderate cadmium polluted rice soil in Huidong County, Guangdong Province as an example, and the specific implementation method is:

[0030] (1) The conditioner is prepared according to the parts by weight, 100 parts of mushroom dregs and 900 parts of shell powder, and stirred evenly for later use.

[0031] (2) In March 2018, the conditioner was applied to the base, and the application method was to spread the whole field, and the application rate was 120kg / mu. Controls received no conditioner.

[0032] The result is as follows:

[0033] deal with Rice cadmium content (mg / kg) conditioner 0.223 control 0.357

[0034] The results showed that the cadmium content of rice treated with conditioner was 0.223mg / kg, which was 37.54% lower than that of the control 0.357mg / kg.

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Abstract

The invention belongs to the technical field of pollution treatment for cultivated lands and particularly relates to a rice cadmium-lowering conditioner and a rice cadmium lowering method. The rice cadmium-lowering conditioner is made with one or any of mushroom residue, plant ash, peat and shell powder; the cadmium content of rice can be lowered effectively by applying 100-150 kg of the rice cadmium-lowering conditioner, per mu, to the rice soil under medium or light cadmium pollution. The agricultural solid waste is used in the method herein mainly to make the rice cadmium-lowering conditioner. According to the method herein, the cadmium content of rice cultivated in the rice soil under medium and light cadmium pollution is decreased by 20-55% in comparisons. The rice cadmium-lowering conditioner and the method herein have the advantages that, for instance, the materials are easy to attain, the reserves of materials are high, the cost is low, the method is simple, the conditioner andthe method are friendly to the environment, the cadmium-lowering effect is significant; the agricultural solid waste is recycled, with food safety and environmental protection balanced.

Description

technical field [0001] The invention relates to the technical field of cultivated land pollution control, in particular to a rice cadmium-reducing conditioner and a rice cadmium-reducing method. Background technique [0002] Rice is the largest food crop in my country and the most important cereal crop in southern China. China is facing a very serious rice cadmium pollution problem. Compared with other heavy metals, cadmium in soil is mainly concentrated in rice cadmium because of its high mobility, high toxicity and easier absorption by plants. Exceeded the standard. It is reported that the exceeding standard rate of heavy metal cadmium in rice reaches more than 10%. The cadmium pollution of rice soil in my country is mainly moderate to mild cadmium pollution. Therefore, finding a simple, effective and environmentally friendly method to reduce cadmium content in rice in rice soil polluted by moderate to mild cadmium will be of great importance to ensure food quality and s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01B79/02C09K17/40B09C1/00C09K101/00
CPCA01B79/02B09C1/00B09C2101/00C09K17/40C09K2101/00
Inventor 邱崇文林先贵叶旭红王一明张锋盛吉强蒋耀智
Owner SHENYANG AGRI UNIV
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