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Paddy safety production method for paddy field soil with moderate-severe cadmium pollution

A technology for safe production and cadmium pollution, which is applied in the field of rice safety production, can solve the problems that it is difficult to significantly reduce the accumulation of cadmium in brown rice, the amount of passivation repair materials is large, and the absorption and accumulation of cadmium is not considered, so as to achieve no impact on rice production and no ecological environment Risk, effect of reducing cadmium content in brown rice

Pending Publication Date: 2020-07-24
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, for the treatment of medium and severe cadmium polluted paddy fields, the commonly used single technical measures such as flood irrigation, in-situ chemical passivation repair, and low-accumulation varieties are difficult to significantly reduce the accumulation of cadmium in brown rice and achieve safe production. At the same time, some technical measures are not implemented. Considering the differences in the absorption and accumulation of cadmium in different growth stages of rice, the amount of passivation repair materials used in the implementation of technical measures is large, the effect is not significant, the operation of continuous multi-season rice planting is cumbersome, and the stability of the effect is poor

Method used

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  • Paddy safety production method for paddy field soil with moderate-severe cadmium pollution
  • Paddy safety production method for paddy field soil with moderate-severe cadmium pollution
  • Paddy safety production method for paddy field soil with moderate-severe cadmium pollution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Field application of rice planting for two consecutive seasons in heavily cadmium-polluted paddy fields

[0031] (1) Field application materials

[0032] The soil passivation agent is mixed uniformly with limestone and sepiolite at a mass ratio of 2:1 to form a soil passivation agent. The antagonistic element silicon applied in the base and the foliar inhibitor sprayed in the foliage are all sodium silicate. The rice variety is Huanghuazhan (conventional rice), which is a common variety in Hunan. The field application site is a heavily cadmium-contaminated paddy field in Liuyang City, Hunan Province. The soil type is acidic red soil. The basic physical and chemical properties are shown in Table 1.

[0033] Table 1 Basic physical and chemical properties of the soil in the test field

[0034]

[0035] (2) Operation plan for field application of late rice in the first season

[0036] In July, the first season of late rice planting and application was carr...

Embodiment 2

[0060] Embodiment 2: Moderate cadmium polluted paddy field field application

[0061] (1) Field application materials

[0062] The soil passivation agent is to mix limestone, sepiolite, hydroxyapatite and zeolite uniformly in a mass ratio of 4:2:1:2. Both the antagonistic element silicon applied on the base and the inhibitor sprayed on the foliage were sodium silicate. The foliar inhibitor is composed of sodium silicate and surfactant Tween. The rice variety was Hyou 518 (indica hybrid rice). A moderately cadmium-polluted paddy field in Beishan Town, Changsha County was selected for a field experiment, and the soil type was sandy mud. The basic physical and chemical properties of the tested soil are shown in Table 5.

[0063] Table 5 Basic physical and chemical properties and heavy metal content of the tested soil

[0064]

[0065] (2) Operation plan

[0066] Two treatments are set for field application, the technical treatment of the present invention is T treatment,...

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Abstract

The present invention discloses a paddy safety production method for paddy field soil with the moderate-severe cadmium pollution. The method comprises the steps of (1) throwing a passivation agent onthe surface of the paddy field soil, performing turnover until the passivation agent is uniformly mixed with the soil, keeping the water content of the paddy field soil at 60% or above after application of the passivation agent, and performing balance culture for 3-7 days; (2) applying a silicon compound-containing antagonistic element by a method of performing basal application of the half amountbefore paddy planting and performing additional application of the rest half amount in a paddy booting stage; and (3) spraying a leaf surface blocking control agent once in each of the paddy bootingearly stage and filling stage, wherein the leaf surface blocking control agent is prepared by mixing a silicon compound, a surfactant and water. The paddy safety production method can obviously reducethe content of cadmium in paddy rice, the operation method is simple and convenient, and the effect is stable.

Description

technical field [0001] The invention belongs to the technical field of safe utilization of heavy metal-contaminated soil, in particular to a rice safe production method for medium-to-severe cadmium-polluted paddy field soil. Background technique [0002] Soil is the foundation of agricultural planting, and crop yield and quality are closely related to soil health. With the rapid development of industry and agriculture, the problem of heavy metal pollution in soil is becoming more and more serious. Cadmium is a common polluting element in cultivated soil and is considered to be one of the most toxic elements in the environment. After entering the human body, it can accumulate in the liver, kidney and other organs for a long time, and cause symptoms of osteoporosis and osteomalacia. As one of the three major food crops in the world, rice is the staple food for more than 50% of the world's population. Rice is also a typical cadmium-tolerant crop. Cadmium is easy to accumulate i...

Claims

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Application Information

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IPC IPC(8): A01G22/22A01G7/06A01B79/02A01C21/00C09K17/12A01N59/00A01P21/00C09K101/00C09K109/00
CPCA01G22/22A01G7/06A01B79/02A01C21/00C09K17/12A01N59/00C09K2101/00C09K2109/00
Inventor 周航廖柏寒辜娇峰刘佳炜易红伟孙志光何晓林王彦臻刘湘华
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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