Soil improving agent for reducing plumbi content of tea and method thereof

A technology of soil conditioner and lead content, which is applied in the direction of soil conditioning materials, chemical instruments and methods, organic fertilizers, etc., and can solve the problems of reducing the bioavailability of lead

Inactive Publication Date: 2008-01-23
TEA RES INST CHINESE ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still a lack of corresponding methods for how to reduce the lead content in crops in non-polluted soil such as tea gardens
Although calcium carbonate, dolomite powder, phosphate rock powder and calcium magnesium phosphate fertilizer have th

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0019] Get tea garden soil and carry out pot experiment, soil lead content is 65mg / kg, and pH is 3.7, reduces the soil conditioner of tea lead content (the ratio of product A and B is 10: 1, and product A is calcium carbonate, and product B is made of carbonic acid Calcium and calcium magnesium phosphate fertilizer, the ratio of the two is 2:1), the application rate is 0, 1 and 2g / kg (equivalent to 0, 2400 and 4800kg / hm 2 ), six annual Longjing 43 tea seedlings were planted in each pot, and after 2 years of growth, the lead content in the tea tree was determined. The results show that after using the lead-reducing agent, with the increase of soil pH and the decrease of effective lead content, the lead content of each part of the tea tree is significantly reduced, and the lead content of new shoots is reduced by 17% when the treatment of 2g / kg is applied. (Table 1).

[0020] Table 1 Effect of potted application of soil lead-reducing amendment on lead content of tea trees

[0...

specific Embodiment 2

[0022] Carry out field test in mature tea garden, the lead content of tea garden soil is 58mg / kg, and pH is 3.6, reduces the soil conditioner of tea lead content (the ratio of product A and B is 20: 1, product A is dolomite powder, product B Composed of dolomite powder and phosphate rock powder, the ratio of the two is 4:1) The application rates are 0, 2400 and 7200kg / hm respectively 2 , of which 7200kg / hm 2 The treatment was applied twice. After the amendment was applied to the soil, it was observed continuously for 4 years. The results showed that except for the year (2002) when the lead-reducing improver was used, there was no significant difference, and the lead content in tea leaves decreased significantly in other years. The determination of soil lead components also showed that after using the lead-reducing amendment, the exchanged state and carbonate-bound lead in the soil with high bioavailability were significantly reduced, among which 7200kg / hm 2 The exchanged le...

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PUM

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Abstract

A soil improver reducing the lead content of tea leaves and a method are provided, which is characterized in that the improver consists of a product A and a product B; wherein, the product A is calcium carbonate and / or dolomite fines and the product B is the mixture of the product A, phosphate rock powder and / or calcium-magnesia phosphate fertilizer; the weight ratio of the product A, phosphate rock powder and / or calcium-magnesia phosphate fertilizer in the product B is 2 to 4 : 1. The above soil improver reducing the lead content of tea leaves and the method provide that reducing the lead content of tea leaves is the main purpose, reasonably use the calcium carbonate, dolomite fines, phosphate rock powder and calcium-magnesia phosphate fertilizer, which not only reduces the absorption of the tea plant to the heavy metals, improves the hygienic quality standards of tea leaves but also does not affect the normal growth and development of tea plant and has the function of improving the soil and can effectively reduce the bioavailability of the lead in the tea garden soil.

Description

technical field [0001] The invention belongs to the technical field of treatment and repair of heavy metals in severely acidified soil, and in particular relates to a soil conditioner and a method for reducing the lead content of tea leaves. Background technique [0002] Lead is a highly accumulative, multi-affinity physiological and neurotoxic substance, which can cause toxicity to almost all important organs and systems of the human body, such as the central nervous system, immune system, reproductive system and endocrine system, etc. The central nervous system is particularly toxic. For children, even trace amounts of lead pollution can damage their nervous system and affect their behavior and intelligence. There are many sources of lead in the human body, mainly through food, water and air. For adults, the main way of lead intake is food. Therefore, the lead content in food, including tea, has aroused widespread concern among consumers. However, in recent years, the p...

Claims

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Application Information

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IPC IPC(8): C09K17/02C09K101/00
Inventor 韩文炎阮建云石元值马立锋
Owner TEA RES INST CHINESE ACAD OF AGRI SCI
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