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Paddy soil heavy metal passivating improver

A heavy metal and paddy field technology, applied in the field of farmland soil environment restoration, to achieve the effect of increasing mu yield, increasing yield, and low cost

Pending Publication Date: 2019-06-21
湖南省地球物理地球化学勘查院
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects of the most common cadmium-arsenic complex polluted farmland soil remediation in the prior art, the purpose of the present invention is to provide a method that can effectively increase the soil pH value and reduce its change rate, reduce the content of active cadmium and arsenic in the soil and The enrichment amount of cadmium and arsenic in crops, and the paddy field soil heavy metal passivation improver to improve the available phosphorus content in the soil and the enrichment ability of crops to soil selenium

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to previous investigation and evaluation results, a soil layer of 0-20 cm thick on the surface was collected in an alluvial plain farmland in the Xiangjiang River Basin. When the humidity reaches 18.5%, it is divided into 24 parts, and each part is sampled to test pH, Cd, As, Cr, Cu, Pb, Zn. After mixing, the results of all soil tests are basically the same, the average value of pH is 5.82, and the average value of Cd is 3.72mg / kg, As average 23.57mg / kg, Hg average 2865μg / kg, Pb average 53.76mg / kg, Cu average 42.39mg / kg, Cr average 83.17mg / kg. The overall soil is slightly acidic, and the existing soil environmental problem is that the total amount of Cd exceeds the standard.

[0021] Set natural zeolite powder (Z), natural limestone powder (CA), natural zeolite powder and natural limestone powder mixed (ZCA), natural zeolite powder and potassium dihydrogen phosphate (ZP), natural limestone powder and potassium dihydrogen phosphate (CAP) , potassium dihydroge...

Embodiment 2

[0029] Using the test method of plot test and field demonstration, the plan sets up ten demonstration fields and two field test fields, and sets up one treatment for each demonstration field, and observes the actual effect of each plan on soil and crops under natural conditions; five test fields are set up in total. For treatment measures, each treatment measure has three repetitions and a control to compare the pros and cons of each treatment measure in a basically consistent natural farmland environment. The selected experimental field is No. TM17 experimental field of Tongmuwo Village Experimental Base, Xinxu Town, Xintian County, Hunan Province, with an area of ​​0.95 mu. The soil of the test field is light gray-yellow paddy soil, the texture configuration is compact, the soil texture is clay loam, and the plow layer thickness is about 27cm. The average soil pH is 8.0, which belongs to alkaline soil, and the soil organic matter content is 6.01%. The main nutrient element i...

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Abstract

The invention discloses a paddy soil heavy metal passivating improver. The paddy soil heavy metal passivating improver comprises a main agent and an auxiliary agent, wherein the main agent comprises natural zeolite, natural limestone and potassium dihydrogen phosphate; the auxiliary agent comprises animal manure, vermiculite, a decomposing agent and a silicon fertilizer. The paddy soil heavy metalpassivating improver can effectively increase the pH value of soil, reduce the change rate thereof, reduce the active cadmium and arsenic contents of the soil and the enrichment amounts of cadmium and arsenic in crops, increase the available phosphorus content of the soil and improve the soil selenium enriching capability of the crops.

Description

technical field [0001] The invention relates to a soil improver, in particular to a passivation improver for cadmium-arsenic compound polluted neutral / acidic soil in farmland, and belongs to the technical field of farmland soil environment restoration. Background technique [0002] Soil is the foundation of human production and life. The production of industrial, mining and smelting plants and the dumping of waste will inevitably pollute the surrounding soil, and agricultural production activities on the polluted soil will inevitably cause food safety problems; with the "National Soil Pollution Survey Bulletin" and With the release of the "Soil Pollution Prevention and Control Action Plan", soil pollution control has become a research hotspot. At present, the idea of ​​soil heavy metal pollution control has changed from the complete removal of heavy metals to the implementation of risk-based control strategies. [0003] With the massive development and utilization of resour...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C09K109/00C09K101/00
Inventor 徐雪生骆检兰鲁江
Owner 湖南省地球物理地球化学勘查院
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