A rice heavy metal absorption blocker and its application method

A technology of blocking agent and rice is applied in the field of prevention and control of heavy metal polluted farmland, which can solve the problems such as the lack of necessary conditions for large-scale popularization and application, the influence of soil structure and physical and chemical properties, and the large application amount of passivators, and achieves remarkable application effect. Eliminate threats to human health and achieve high-yield and high-quality results

Active Publication Date: 2018-07-17
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To achieve the purpose of effectively passivating soil heavy metals, the amount of passivating agent is generally large, which has a great impact on the soil structure and physical and chemical properties, often leading to a decrease in the yield of cultivated land, and the farmers' income will be greatly affected
In addition, there are phytoremediation methods (CN102500614A, CN101941018B, CN102172608B, CN102172611B, CN104858226A, CN103109651A), but for China where cultivated land resources are scarce, the necessary conditions for large-scale promotion and application are not yet available

Method used

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  • A rice heavy metal absorption blocker and its application method
  • A rice heavy metal absorption blocker and its application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The basic physical and chemical properties of the soil of embodiment 1 and embodiment 2 are: soil pH value 5.75, total cadmium content is 1.75mg / kg, total lead content is 888.6mg / kg, organic matter 23.58g / kg, total nitrogen 1.45g / kg, The total phosphorus is 0.49g / kg, the total potassium is 4.86g / kg, and the rice variety is Huanghuazhan. In the embodiments of the present invention, the annotations to the basic physical and chemical properties such as the lead and cadmium content of the soil in the experiment and the rice varieties are only to illustrate the effect of reducing the heavy metal content in the rice after spraying the barrier agent of the present invention in the embodiment, which is in line with the technical characteristics of the present invention. Polluted farmlands can achieve similar effects by adopting the technology of the present invention.

[0029] Example 1 Using α-ketoglutaric acid as a blocking agent

[0030] There are 5 treatments in the implem...

Embodiment 2

[0036] Example 2 Using Glycerol, Oxaloacetic Acid and α-Ketoglutaric Acid as Blocking Agents

[0037] There are 5 treatments in the implementation site (see Table 3), and 3 plots are set up for each treatment, and the area of ​​each plot is 200m 2 , the plots are randomly arranged, and a 50cm guard line is set between each plot. Fertilization, pest control and field management were the same for each treatment, and the rice was harvested at the same time and the contents of heavy metals cadmium and lead in rice were determined respectively.

[0038] Table 3 Plot test plan of different application methods using glycerol, oxaloacetate and α-ketoglutarate as barrier agents

[0039] deal with

No

Approach

CK

No spray barrier

T5

Spray about 12L of 0.8mmol / L glycerin solution at the rice filling stage, spray twice with an interval of 3 days.

T6

Spray about 12L of 0.6mmol / L oxaloacetic acid solution at the rice filling stage, and spray twi...

Embodiment 3

[0044] The implementation site is 40 mu of rice fields slightly polluted by lead and cadmium in northern Guangdong, where the total cadmium content in the soil is 0.87mg / kg-1.12mg / kg, and the total lead content is 488.6mg / kg-658.5mg / kg. The rice varieties planted include hybrid rice: Liangyou 191, and conventional rice: Guihuazhan. In the splitting stage of rice, mix 2.5g of glycerol with 50kg of water per acre, and spray it on the rice leaves; product) solution, sprayed on rice leaves. Implementation effect: The average contents of lead and cadmium in paddy fields without glycerol and oxaloacetic acid were 0.123mg / kg and 0.189mg / kg respectively, and the average contents of lead and cadmium in paddy fields sprayed with glycerol and oxaloacetic acid were 0.078mg / kg and 0.104mg / kg, and the average yield of rice per mu increased by 38kg.

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Abstract

The invention discloses a rice cadmium and lead absorption blocking agent and its application method, wherein the active ingredient of the blocking agent is one or more of α-ketoglutaric acid, glycerol, and oxaloacetic acid, which can be used in rice tillering The purpose of blocking heavy metal absorption and transfer to rice can be achieved by foliar spraying at the early stage, heading stage and (or) filling stage. The invention can significantly reduce the content of heavy metals in paddy fields polluted by heavy metals such as lead and cadmium, so that the rice produced in paddy fields polluted by light or moderate heavy metals meets food safety standards. The effective spraying concentration of the barrier agent of the present invention is low, and can be sprayed after being mixed with the pesticide for preventing and controlling rice diseases and insect pests, and the cost is low.

Description

technical field [0001] The invention belongs to the field of prevention and control of heavy metal polluted farmland, and in particular relates to a rice heavy metal absorption blocking agent and a use method thereof. Background technique [0002] The area of ​​cultivated land polluted by heavy metals in my country is nearly 20 million hectares, accounting for about 1 / 5 of the total cultivated land area, resulting in an annual reduction of more than 10 million tons of grain, more than 12 million tons of contaminated grain, and a total economic loss of at least 20 billion yuan. Soil heavy metal pollution has become a major obstacle to my country's sustainable development. Rice is a crop that absorbs cadmium and its grains accumulate very strongly. The research of Wu Qitang et al. (1999) also showed that when the growth of rice was not affected, the cadmium content in brown rice exceeded the hygienic standard by several times or even ten times. Zhen Yanhong et al. (2008) evalu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N37/42A01N31/02A01P21/00
CPCA01N31/02A01N37/42A01N2300/00
Inventor 毛小云陈娴汪立梅钟秀娟邵湘晴
Owner SOUTH CHINA AGRI UNIV
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