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Soil conditioner for reducing cadmium and lead pollution to crop

A soil conditioner, lead pollution technology, applied in soil conditioning materials, agriculture, fertilizer mixtures and other directions, can solve the problems of amaranth Cd pollution prevention and control technology research, reduce heavy metal content and other problems, achieve good effects, promote growth, and good adsorption. Effect

Inactive Publication Date: 2010-06-09
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, for heavy metal hyperaccumulator plants, the soil amendments disclosed in the prior art cannot significantly reduce their heavy metal content.
For example, amaranth is a proven hyperaccumulator of heavy metal Cd (Wang, 2007 Ph. -1 When grown in soil, the Cd content of edible parts is as high as 115.7-141.8mg kg -1 , there is no research on the prevention and control technology of Cd pollution in amaranth

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] When applying the soil amendment of formula 1, the determination of crop cadmium, lead content and biomass:

[0031] Specifically follow the steps below:

[0032] Step 1: Select Cd, Pb compound polluted soil as the test soil, after measurement, the Cd concentration in the test soil is 0.88mg kg -1 , with a Pb concentration of 162mg kg -1 (Soil condition is identical with comparative example 1).

[0033] Step 2: Preparation and application of soil conditioner. The soil conditioner used is Ca(OH) 2 and rice straw, which are applied to the soil before crop planting; the application rates are Ca(OH) 2 1.5g kg -1 Air-dried soil, rice straw 10g kg -1 Dry soil.

[0034] Step 3: Planting and growing of crops. The test time was August 2008. Amaranthus and horseweed are planted in the above-mentioned soil that has applied the soil improver, and the seedlings are thinned after 10 days, and 8 plants are kept in each pot. After 20 days, the seedlings were settled, and 4 pl...

Embodiment 2

[0038] When applying the soil amendment of formula 2, the determination of crop cadmium, lead content and biomass:

[0039] Step 1: Select Cd, Pb compound polluted soil as the test soil, after measurement, the Cd concentration in the test soil is 0.88mg kg -1 , with a Pb concentration of 162mg kg -1 (Soil condition is identical with comparative example 1).

[0040] Step 2: Preparation and application of soil conditioner. The soil conditioner used is Ca(OH) 2 、Na 2 SiO 7 and bean shedding, applied to the soil before crop planting; the application rates were Ca(OH) 2 1.5g kg -1 Air-dried soil, Na 2 SiO 7 1.5g kg -1 Air-dried soil, edamame shedding 20g kg -1 Dry soil.

[0041] Step 3: Planting and growing of crops. The test time was August 2008. Amaranthus and horseweed are planted in the above-mentioned soil that has applied the soil improver, and the seedlings are thinned after 10 days, and 8 plants are kept in each pot. After 20 days, the seedlings were settled, ...

Embodiment 3

[0045] When applying the soil amendment of formula 3, the determination of crop cadmium, lead content and biomass:

[0046] Step 1: Select Cd, Pb compound polluted soil as the test soil, after measurement, the Cd concentration in the test soil is 0.88mg kg -1 , with a Pb concentration of 162mg kg -1 (Soil condition is identical with comparative example 1).

[0047] Step 2: Preparation and application of soil conditioner. The soil conditioner used was Na 2 SiO 7 and rice straw, which are applied to the soil before crop planting; the application rates are Na 2 SiO 7 1.5g kg -1 Air-dried soil, rice straw 10g kg -1 Dry soil.

[0048] Step 3: Planting and growing of crops. The test time was August 2008. Plant amaranth in the above-mentioned soil that has been applied with the soil improver, thin out the seedlings after 10 days, and keep 8 plants in each pot. After 20 days, the seedlings were settled, and 4 plants were kept in each pot. During the test period, watering w...

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Abstract

The invention relates to a soil conditioner for reducing the cadmium and lead pollution to crops, comprising inorganic components and organic components, wherein the effective components of the inorganic components are Ca(OH)2 and Na2SiO7 or mixtures of the Ca(OH)2 and the Na2SiO7; and the organic components include rice straws and tephrosia caudida casts or mixtures of the rice straws and the tephrosia caudida casts. The soil conditioner is used before the crops are cultivated; the inorganic components are prepared into agricultural-grade powder and 0.5-4 g of the inorganic components is used for one kilogram of wind drying soil; and the grain diameter of the crushed organic components is less than 1 cm and 5-40 g of the organic components is used for one kilogram of wind drying soil. The soil conditioner effectively reduces the biological effectiveness of heavy metal, the absorption of cadmium and lead by the crops and the heavy metal pollution to the crops and especially leafy vegetables without reducing the production property of the corps.

Description

technical field [0001] The invention relates to a soil improver for crops, in particular to a soil improver for reducing soil cadmium and lead pollution. Background technique [0002] At present, soil heavy metal pollution has become a major environmental problem worldwide, and soil heavy metal pollution in my country is also becoming more and more serious. According to statistics, the currently polluted cultivated land area in China is nearly 20 million hectares, accounting for about 1 / 5 of the total cultivated land area (Wei Chaoyang and Chen Tongbin, 2001). Among them, nearly 7 million hectares of farmland have been polluted by industrial "three wastes", reducing grain production by 10 billion kilograms per year (http: / / www.365jk.com / SP / 2007 / 0325 / article_88.html). But due to enormous population pressure, most of the contaminated farmland is still used for crop production. 2.59 million hm in 47 counties and suburbs in a certain province 2 The cultivated land (accounting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40
CPCC04B2103/10C04B2111/00758C04B2111/00017C04B2111/10C04B40/0039Y02W30/91C04B12/04C04B18/248C04B22/064C04B2103/0001
Inventor 杨中艺周轶慧袁剑刚郑晶薛梦
Owner SUN YAT SEN UNIV
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