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Compound fertilizer capable of reducing cadmium content in rice with overproof cadmium and preparation method thereof

A technology of compound fertilizer and content, applied in fertilization device, fertilizer mixture, application and other directions, can solve problems such as weak effect and reduction of cadmium absorption

Active Publication Date: 2012-06-27
INST OF SUBTROPICAL AGRI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research results of Chen et al. (2000) showed that the addition of manganese oxide can reduce the content of cadmium extracted from EDTA, HAc and Hal in the soil, and reduce the absorption of cadmium in the aboveground parts of crops; the addition of iron oxide can also effectively reduce the content of cadmium extracted from HAc , also has a greater inhibitory effect on the absorption of cadmium in the aboveground part of crops, but its effect is weaker than that of manganese oxide

Method used

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  • Compound fertilizer capable of reducing cadmium content in rice with overproof cadmium and preparation method thereof
  • Compound fertilizer capable of reducing cadmium content in rice with overproof cadmium and preparation method thereof
  • Compound fertilizer capable of reducing cadmium content in rice with overproof cadmium and preparation method thereof

Examples

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Effect test

Embodiment 1

[0044] A compound fertilizer for reducing cadmium content in paddy fields with excessive cadmium, which is made from the mass fraction of the following raw materials:

[0045]

[0046]

[0047] A method for preparing compound fertilizer for reducing cadmium content in paddy fields with excessive cadmium, the steps are:

[0048] A. Use raw sepiolite, ball milled to 100 mesh, or 110 mesh, or 120 mesh, or 130 mesh, or 140 mesh, and set aside. Sepiolite raw ore of the present invention, the sepiolite content that it contains must reach 80-99%, the content (in terms of Cd) of heavy metal cadmium should≤5mg / kg, moisture content (in terms of H 2 O meter) should be ≤ 1.5%.

[0049] B. Select clean red mud and ferromanganese ore raw ore, mix evenly according to the ratio of 7 (clean red mud): 3 (high iron manganese ore raw ore), and pass through ball milling to 100 mesh, or 110 mesh, or 120 mesh, or 130 mesh , or 140 mesh made of iron-manganese oxides, spare. Clean red mud of ...

Embodiment 2- example 8

[0055] A compound fertilizer for reducing cadmium content in paddy fields with excessive cadmium, which is made from the mass fraction of the following raw materials:

[0056]

[0057] Its preparation steps are identical with embodiment 1.

[0058] Pilot test and demonstration of a compound fertilizer for reducing cadmium content in paddy fields with excessive cadmium:

[0059] During the period from 2008 to 2010, in Zhuzhou Majia River heavy metal pollution area (soil is cadmium-nickel compound pollution type), Anhua 715 mining area (soil is cadmium pollution type), Jiahe Taojia River heavy metal pollution area (soil is lead-cadmium compound pollution type) type), Liuyang Zhentou heavy metal pollution area (soil is cadmium pollution type) and Shuangfeng Zimen bridge heavy metal pollution area (soil is cadmium-lead compound pollution type) conducted field pilot tests, and carried out a moderate scale in 2010 (10hm 2 / district) demonstration and promotion (early, middle an...

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Abstract

The invention discloses a compound fertilizer capable of reducing cadmium content in rice with overproof cadmium and a preparation method thereof. The fertilizer is prepared from urea, ammonium chloride, ammonium sulfate, diammonium phosphate, nitrophoska, a calcium magnesium phosphate fertilizer, potassium chloride, zinc sulfate, sepiolite, ferrimganic oxide, kaolin, bentonite and power plant slags in a certain proportion. The preparation method comprises the following steps: A, preparing the sepiolite; B, preparing the ferrimganic oxide; C, preparing the kaolin; D, preparing the bentonite; and E, preparing the power plant slags. In addition, scale production is carried out by a compound fertilizer process flow namely extrusion and granulation. The compound fertilizer is characterized inthat 38.5-50.5% of passivator such as sepiolite, ferrimganic oxide, calcium magnesium phosphate fertilizer, kaolin, bentonite, power plant slags and the like (wherein the sepiolite accounts for 20-32.5%) are contained; the content of the total nutrition (N+P2O5+K2O) is 25%, the soil activated cadmium in the rice with the overproof cadmium is reduced by 31.9-58.5%, rice cadmium is reduced by 28.7-51.7% (the content is less than 0.2mg / kg); and the compound fertilizer has huge popularization and application value in light-grade cadmium-polluted areas.

Description

technical field [0001] The invention belongs to the technical field of agricultural environment conservation and restoration, and more specifically relates to a compound fertilizer that can effectively reduce the cadmium content in rice fields with cadmium exceeding the standard, and also relates to the preparation of a compound fertilizer that can reduce the cadmium content in rice fields with cadmium exceeding the standard method, which is suitable for rice production in heavy metal-polluted areas, especially lightly cadmium-polluted areas. Background technique [0002] With the continuous advancement of industrialization and urbanization, the problem of heavy metal pollution in my country's soil has been paid more and more attention by people. According to relevant reports, in the early 1980s, the area of ​​cultivated land polluted by heavy metals such as cadmium, lead, mercury, arsenic, chromium, and nickel in my country was only 2.67 million hm 2 , increased to 6.67 mi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00C05G3/04C05G3/80
Inventor 黄道友朱奇宏罗尊长刘守龙陈焱国雷敏周斌饶中秀曹晓玲朱昌宇
Owner INST OF SUBTROPICAL AGRI CHINESE ACAD OF SCI
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