A method for synergistically reducing chromium uptake during rice cultivation by coupling biochar to water management
A technology of biochar and rice, which is applied in the direction of soil preparation, rice cultivation, agricultural machinery and tools, etc., can solve the problems of inability to ensure the chromium content of rice and meet the national food safety standards, and achieve the reduction of chromium absorption in rice, easy management, and preparation The effect of simple method
Active Publication Date: 2021-10-15
ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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Problems solved by technology
[0007] However, the applicant found in later studies that although the above-mentioned water management method can reduce the chromium content in rice to a certain extent, it still cannot ensure that the chromium content in rice meets the national food safety standard in moderately or heavily chromium-polluted paddy fields (rice Chromium <1.0mg / kg)
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[0055] Experimental Materials
[0056] The test soil was collected from chromium-contaminated soil around a chromium slag storage area in Wenzhou City, Zhejiang Province (total chromium concentration 266.5±5.3mg kg -1 , hexavalent chromium concentration 18.6±1.5mg kg -1 ). After the soil is collected and brought back, air-dry, pick out plant roots, stones and other sundries, grind it, pass it through a 2mm sieve and mix it for later use.
[0057] Choose rice straw as the raw material for biochar, crush the rice straw, put it in a crucible with a cover, cover it to isolate oxygen, and put it in a muffle furnace, crack it at 500°C for 6 hours, take out the crucible after cooling, and crush the biochar Pass through a 2mm sieve for later use.
[0058] The basic physical and chemical properties of soil and biochar are shown in Table 1 below.
[0059] Table 1 Basic physical and chemical properties of the tested soil and biochar
[0060] parameter soil bio-charcoal...
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The invention relates to the technical field of rice planting, and discloses a method for synergistically reducing chromium absorption during rice planting by coupling biochar to water management, including: 1) preparing biochar; 2) applying biochar to chromium-contaminated soil, mixing evenly, Then rice is planted; 3) Water management is carried out by flooding during the critical growth period during rice growth. The method of the present invention using biochar coupled with water management to reduce the absorption of chromium in rice can play a synergistic effect, effectively solve the problem of rice production in chromium-contaminated farmland, and effectively reduce the chromium content in rice produced in chromium-contaminated farmland, and the method of the present invention is used after determination The chromium content in the planted rice meets the national food safety standard (rice chromium <1.0 mg / kg), which provides an effective way for the safe utilization of chromium-contaminated farmland.
Description
technical field [0001] The invention relates to the technical field of rice planting, in particular to a method for synergistically reducing chromium absorption during rice planting by coupling biochar with water management. Background technique [0002] Heavy metal chromium is an important raw material in industries such as alloy materials, leather, dyes, electroplating, printing and dyeing, medicine, and catalysis. In my country, about 750,000 to 900,000 tons of chromium-containing waste residues are produced every year. Due to the long-term stacking of chromium residues in some chemical plants without proper disposal, chromium pollution has migrated and the scope of pollution has expanded. Chromium is a highly toxic and potentially harmful pollution factor, which is enriched in soil through migration. [0003] Chromium in the soil enters the human body through the food chain, which may cause lesions in internal organs such as liver and kidney. Rice is the main food crop...
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IPC IPC(8): A01G22/22A01B79/02
CPCA01B79/02A01G22/22
Inventor 肖文丹叶雪珠张棋赵首萍陈德
Owner ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES