85results about How to "Reduced Cd content" patented technology

The invention discloses a method for repairing a cadmium-polluted farmland by using corn and alfred stonecrop intercropping. The method comprises the following steps: (1) in the cadmium-polluted farmland soil, planting corn seedlings and alfred stonecrop seedlings by using an intercropping mode, dressing a nitrogen phosphorus and potassium compound fertilizer and an organic fertilizer for promoting the growth of the corn and alfred stonecrop; (2) within a week after dressing the fertilizers, spraying oilseed rape root extracting solution to the root of the alfred stonecrop, harvesting the alfred stonecrop regularly, and harvesting the corn after the corn is matured; the preparation process of the oilseed rape root extracting solution comprises the following steps: a, pounding the fresh oilseed rape root, soaking in water, heating and boiling for more than 1 h, cooling soaking liquid to the room temperature, and stewing for more than 24 h; and b, after stewing, separating solid and liquid, and taking a liquid phase which is the oilseed rape root extracting solution. The method is capable of realizing a corn and alfred stonecrop intercropping technology, through spraying the oilseedrape root extracting solution to the root of the alfred stonecrop, overcoming the problem in the prior art that the Cd content in the corn is still high after the corn and alfred stonecrop intercropping and the plant removal rate of Cd in the soil is not high.

The invention relates to a method for reducing cadmium content of rice seedling leaves, and a rice seedling nutrient solution recipe. The method comprises: (1) rice variety being Yangdao 6; (2) sowing seeds whose surfaces are disinfected to plugs which use vermiculite as medium, putting the plugs in a phytotron to culture for 1-2 weeks; (3) selecting rice seedlings to transplant in cultivating pots, the nutrient solution used for water planting being international rice nutrient solution and being added with microelements. Through discussing influence of external Fe and Mn on formation of rice seedling root iron plaque and on Cd absorption and transport and on rice seedling antioxidant enzyme activities, the method provides new thoughts for rice root iron plaque research and rice safety production on Cd polluted fields.

The invention relates to a rice field irrigation method for reducing the content of cadmium in rice. The method comprises the steps of controlling water at tillering stage and heading stage of rice, irrigating in a waterflooding manner at other stages, and keeping the water layer being 5-10 cm. By strictly controlling the water control period and water control degree of the rice field, the rice field irrigation method can effectively reduce the content of cadmium in rice without affecting the rice yield.

The invention provides a quantum dot liquid crystal display device, which comprises a quantum dot liquid crystal display panel and a backlight module. The quantum dot liquid crystal display panel comprises a color film substrate and an array substrate and a liquid crystal layer arranged between the color film substrate and the array substrate. The color film substrate comprises a first substrate, a color film layer and an upper polarizer, wherein the color film layer comprises a plurality of transparent color film units and a mixed color film unit arranged in a matrix, and the backlight module includes a blue backlight light source and a red backlight light source, among which the backlight module alternately circulates the blue backlight light source and the red backlight light source according to preset timing driving rules. The invention effectively reduces the Cd content of the quantum dot liquid crystal display device, achieves the goal of the quantum dot liquid crystal display device satisfying the high color gamut coverage, and also greatly enhances the light output rate of the quantum dot liquid crystal display panel.

The invention discloses a high-yield rice planting method for reducing the cadmium content in rice. The method comprises the steps of selection of a low-cadmium accumulation variety, soil remediationand various agronomic measures. The method can significantly reduce the cadmium content in the rice planted in cadmium-contaminated rice soil and has the advantages of being simple, efficient and freeof secondary contamination. The method has the advantages of increasing the yield of the rice, the yield is increased while the quality of the rice is improved, the planting economic benefits are increased, and the method is suitable for the production of the low-cadmium rice in cadmium-contaminated rice planting areas and has broad application prospects.

The invention discloses a microbial remediation method for cadmium-polluted bottom mud, and belongs to the field of microbial remediation of the bottom mud. The method comprises the following steps: enriching sulfate reducing bacteria, domesticating the sulfate reducing bacteria and expanding culture of the sulfate reducing bacteria; and repairing the Cd-polluted bottom mud by using the sulfate reducing bacteria. According to the method, the sulfate reducing bacteria and compound bacteria are added into the Cd-polluted bottom mud after separation identification, the content of the exchangeable form and the carbonate binding form of the Cd can be reduced, the content of the iron-manganese oxide binding form, the organic matter binding form and the residue form can be increased, so that the Cd is converted into a stable form, the content of the Cd in pore water of the repaired bottom mud is obviously reduced, and therefore the mobility, the biological effectiveness and the toxicity of the Cd are reduced. The method has the characteristics of being simple in technology, low in cost, good in remediation effect and large in in-situ application potential and the like.

The invention discloses a compound heavy metal passivation composition. The heavy metal passivation composition comprises the following effective components by mass: 20 to 30 parts of zeolite, 20 to 30 parts of red mud, 20 to 30 parts of biochar, 20 to 30 parts of humic acid and 5 to 15 parts of silicon-potash fertilizer. Specifically, the heavy metal passivation composition comprises 25 parts of zeolite, 25 parts of red mud, 25 parts of biochar, 25 parts of humic acid and 10 parts of silicon-potash fertilizer. The invention provides the heavy metal passivation composition with the effective components being zeolite, red mud, biochar, humic acid and silicon-potash fertilizer. Testing results show that slag can substantially reduce the content of Cd in plants. The heavy metal passivation composition provided by the invention is applicable to a variety of crops, especially to reduction of the content of Cd in rice plants, and has important application value.

The invention discloses a high-yield selenium-enriched rice planting method capable of efficiently reducing cadmium content in rice. The method comprises the steps of low-cadmium accumulation speciesselection, soil remediation and multiple agronomic measures. By means of the method, the cadmium content of planted rice on a piece of cadmium-polluting rice land can be significantly reduced, the method has the advantages of being simple, efficient and free from secondary pollution; rice yield is improved, rice quality is improved while the yield is improved, planting economic benefits are improved, and the method is suitable to low cadmium rice production in a cadmium-polluting rice planting region and has broad application prospects.

The invention discloses a practical method for repairing cadmium pollution in farmland soil by planting Suliu 795, and belongs to the field of soil restoration. A practical method for repairing cadmium-contaminated farmland soil by planting Suliu 795, the steps are: (1) after selecting the cadmium-contaminated farmland, plowing, breaking up the soil, dividing ridges, and designing drainage ditches; (2) planting Suliu 795 795 young branches; (3) ensure the survival of more than 90% of willow trees through agronomic management and protection, and reduce the Cd content of the original polluted farmland soil by 30% within 2 years. This method can make the Cd content in the polluted soil be reduced by more than 20% on average in the first year by planting the young branches of Suliu 795 in the farmland soil with serious Cd pollution; The farmland with soil Cd content greater than 3.0mg / kg was restored until the Cd content of farmland soil was all less than 1.0mg / kg.

The invention discloses a method for repairing Cd contaminated soil by intercropping herbs and swamp cabbage. The method can repair Cd contaminated soil through intercropping agronomic measures. The method comprises: intercropping herbs and vegetables in Cd contaminated soil to be repaired, and carrying out normal cultivation management so that the Cd content in harvested vegetables and soil is reduced. The vegetables are swamp cabbages. The herbs are sorghum hybrid sudangrass, sudangrass, pennisetum, ryegrass, indian lettuce, chicory, amaranth, clover, alfalfa or astragalus sinicus. The invention provides the technical scheme for repairing Cd contaminated soil by agronomic measures of intercropping herbs in a swamp cabbage field. The intercropped herb has high biomass and a rapid growth rate, can enrich heavy metals such as Cd and can effectively reduce Cd content of the contaminated soil. The method can provide a basis for synchronous safe production and restoration in the Cd contaminated farmland. The method is environment-friendly and has obvious ecological, economic and social benefits.

The invention discloses a high-yield rice planting method capable of efficiently reducing cadmium content in rice. The method comprises the steps of low-cadmium accumulation species selection, soil remediation and multiple agronomic measures. By means of the method, the cadmium content of planted rice on a piece of cadmium-polluting rice land can be significantly reduced, the method has the advantages of being simple, efficient and free from secondary pollution; rice yield is improved, rice quality is improved while the yield is improved, planting economic benefits are improved, and the methodis suitable to low cadmium rice production in a cadmium-polluting rice planting region and has broad application prospects.

The invention discloses a method for reducing the cadmium content of vegetables planted in cadmium contaminated soil. The method includes the following steps that a layer of matrix is laid on the surface of the cadmium contaminated soil to plant the vegetables, and the water-holding capacity of the soil is kept at 60-70%; bacterium liquid of azospirillum brasilense with the conservation number of CGMCC 1.10379 is sprayed on the rhizosphere soil of the vegetables. Harm to crops by soil Cd can be effectively relieved, the vegetable yield is increased, the Cd content of the crops is reduced, and the cadmium is controlled and prevented from entering a food chain along with the crops to harm human health.

The invention relates to a rice field phosphate fertilizer application method capable of reducing the cadmium content of rice grains. The phosphate application level is high; the total phosphate application amount is 135kg / hm<2> based on effective constituents P2O5; phosphate fertilizers are applied for three times; the application amount of each of base fertilizers, tillering fertilizers and granular fertilizers is 1 / 3 of the total phosphate application amount. According to the method, the cadmium content in the rice grains can be effectively reduced and the rice yield can be increased.

The invention provides a barrier agent which is highly targeted to wheat grains and can efficiently prevent the wheat grains from absorbing and transporting heavy metal cadmium. An active ingredient of the barrier agent is EDTA-2Na. The invention also provides a use method of the foliar barrier agent; the foliar barrier agent is sprayed on cadmium-contaminated wheat leaves during a vigorous growth period of wheat, and can efficiently and significantly prevent the wheat grains from absorbing and transporting heavy metal cadmium, and the application times and application amount are small, toxic and side effects are avoided, the normal growth and development of the wheat are not affected, the barrier agent is safe and non-toxic to a human body, and can effectively inhibit the wheat grains from absorbing and transporting heavy metal cadmium and reduce the accumulation of cadmium in the wheat grains. The invention also provides a research method for a barrier mechanism of the foliar barrier agent to heavy metal Cd , and new application of EDTA-2Na, providing a good solution for the cadmium pollution problem of the wheat grains.

The invention discloses a method for repairing farmland soil polluted by cadmium, belongs to the technical field of repairing and treatment of the farmland soil polluted by the cadmium, and solves the problems that the existing technology for repairing the farmland soil polluted by the cadmium is poor in effect, high in cost and not thorough in repairing, the soil cannot be used for farming after being repaired, and the farmland ecologic environment is affected severely. The method includes the steps of firstly, selecting farmland polluted by the cadmium, ploughing the soil of the farmland, crushing the soil, ridging, and arranging draining ditches; secondly, planting Salix Jiangsuensis CL. 172 cuttage in the farmland soil processed by the first step; thirdly, performing agricultural management and protection which includes watering, pest control and weeding on the Salix Jiangsuensis CL. 172 cuttage to allow the same to survive and grow normally. The method has the advantages that the repairing effect of the farmland soil polluted by the cadmium can be increased effectively, the method is low in repairing cost, stable, continuous and durable in repairing cycle and small in labor intensity of workers, the method belongs to the natural repairing technology, and a good ecological environment of the farmland is achieved at the same time.

The invention discloses a tobacco seedling cultivation substrate capable of strengthening seedlings and reducing cadmium absorption and a preparation method and a use thereof. The substrate includes earthworm excrement and attapulgite powder. The preparation method includes the step of mixing earthworm excrement and attapulgite powder at a weight ratio of 10:1 to 1:1. The preparation of the earthworm excrement includes the following steps: composting and fermenting cow dung to form a product of composting and fermenting; breeding earthworms with the product of composting and fermenting; artificially separating the earthworms; obtaining earthworm excrement; air-drying the earthworm excrement to obtain dry earthworm excrement; and sieving the dry earthworm excrement. The preparation of the attapulgite powder includes the following steps: preliminarily grinding attapulgite by a mechanical method; grinding the attapulgite by a ball milling method; and sieving the attapulgite. The tobacco seedling cultivation substrate prepared by the method can significantly increase the weight of tobacco leaves and reduce the content of metal cadmium in tobacco leaves.

The invention discloses a strain of bacillus cereus B-28 and application thereof. A strain of bacillus cereus B-28 is obtained through separation and screening in the invention; the strain is preserved in the Guangdong microbial culture collection centre on July 13th, 2020; and the preservation number of the strain is GDMCC NO:61089. The strain has relatively strong heavy metal Cd passivation capability, has the capability of reducing heavy metal Cd absorption by plants, meanwhile, can repair heavy metal Cd contaminated soil, and can significantly promote the increase of the chlorophyll content of corn leaves and the enhancement of the activity of CAT and POD enzymes at roots, so as to promote the increase of biomass of each tissue of corn; and therefore, the strain has very wide application prospect in repair of heavy metal Cd contaminated soil, promotion of plant growth and prevention and control of heavy metal Cd absorption by plants.

The invention discloses a comprehensive agronomic regulation and control method for producing rice with low heavy metal pollution. The method comprises the steps that a calcium-sulfur-aluminum composite heavy metal passivating agent and base fertilizer are applied to soil of a tillage layer at one time in combination with field preparation; a Gelinmei foliage control agent is separately applied three times in the middle tillering stage, initial heading stage and complete heading stage of rice, and the dosage of each time is 150 g / mu, wherein according to an application approach, a 200-fold solution formed by diluting the Gelinmei foliage control agent with clean water is uniformly sprayed onto the leaf surfaces of rice plants; in the tillering and ripening stages of the rice, the soil water potential of a tillage layer of a rice field is kept at -15-0 KPa, and the field surface is submerged in water in other growth periods. By using the comprehensive agronomic regulation and control method, not only is the yield of the rice increased, but also the content of heavy metals Cd and Pb in the rice is effectively reduced, irrigation water is saved, and the water utilization efficiency isimproved. The method is simple in operation and especially suitable for production of rice products with low heavy metal content in broad rice fields suffering from light and moderate heavy metal pollution in red yellow soil regions of the south of China.

The invention discloses a method for repairing cadmium (Cd) contaminated soil through french marigold-maize intercropping. The method comprises the repairing steps that (1) french marigold seedlings and maize seedlings are intercropped[A1] in farmland soil contaminated by cadmium in spring[A2], and fertilization and irrigation are regularly carried out; (2) repairing accelerating liquid is prepared, and the repairing accelerating liquid is irrigated to roots of the french marigold 1-2 days after the fertilization is carried out every time; and (3) the ripe french marigold and maize are correspondingly harvested; and the repairing accelerating liquid is an aqueous solution of p-hydroxybenzoic acid, glycine, potassium nitrate and a grapestone-rhubarb compound extract. According to the methodfor repairing the cadmium contaminated soil through the french marigold-maize intercropping, the intercropping of the french marigold and the maize is utilized, and the prepared repairing accelerating liquid is utilized to carry out irrigation treatment for the french marigold,[A3] so that the content of Cd in the french marigold is significantly higher than the content of Cd in monocropping french marigold or the intercropping condition without the irrigation of the repairing accelerating liquid, and the content of Cd in corn is lower than the content of Cd in monocropping corn.

The invention relates to the application of NaHS as a foliage conditioner for preventing and controlling the accumulation of cadmium on paddy rice. The spraying concentration of the NaHS is 40 to 60 mu mol L<-1>. The NaHS is continuously sprayed for five times with once every 7 days at the beginning of a heading stage of the paddy rice. 40 to 60 milliliters of NaHS is sprayed for every potted plant every time, and 70 to 80 milliliters of NaHS is sprayed to every acre of land. The NaSH is dissolved for volume fixation directly by water, and a 0.03 to 0.04 percent V / V solubilizing assistant anhydrous ethanol and a 0.005 to 0.02 percent V / V surfactant are added to prepare the NaSH. The enrichment of cadmium on the paddy rice is controlled by spraying NaSH on foliages, and after the NaSH is sprayed, the content of cadmium on paddy rice grains, rice husks and the upper and lower parts of the ground is remarkably reduced, and the risks of production of cadmium rice are greatly reduced.

The invention provides a method for significantly lowering the leaf lettuce cadmium content with salicylic acid and improving the quality of the lettuce. The method comprises the following steps that after leaf lettuce seedlings mature, foliage spraying is conducted with a salicylic acid water solution with the concentration being 25-200 micromol / L, the spraying amount is controlled to meet the condition that water drips from the leaf surface, and spraying is conducted once every two days and conducted three times in total. Accordingly, inhibition of Cd stress to lettuce growth and photosynthesis can be relieved, nitrate and the overground part Cd content of the lettuce are significantly lowered, and the lettuce quality is significantly improved; the lettuce MDA content and electrical conductivity under the Cd stress are lowered, and damage of the Cd stress to a cell membrane is relieved.

The invention discloses a method for reducing the Cd content in cucumber fruits through a grafting technique, and belongs to the technical field of control over the heavy metal content of cucumber fruits. According to the method for reducing the Cd content in the cucumber fruits through the grafting technique, grafting is conducted with common cucumbers as scions and Indo-Chinese hybrid pumpkins as stocks, cucumber plants obtained through grafting have the capability of root systems of the pumpkins of enriching Cd, the transport and transfer amount of Cd to leaves and fruits are reduced, and thus the accumulation amount of Cd in the cucumber fruits is reduced. The safety production of the cucumber fruits is obviously guaranteed, and meanwhile, the production and utilization capability of acadmium pollution field is improved. According to the grafting technique of grafting the cucumber scions onto the pumpkin stocks, the cucumbers of which the Cd content does not exceed the standard are obtained from soil with mild cadmium pollution by means of the grafting technique; meanwhile, the pumpkin stocks absorb Cd to reduce the Cd content in soil, the effect of remediating the soil with cadmium pollution is achieved, and the economical and practical biological remediation effect is achieved.

The invention provides a quantum dot LED backlight light source structure and a display device. The quantum dot LED backlight light source structure comprises a reflection cup shell, a blue light chip structure and a red light chip, wherein the reflection cup shell is used for mounting a quantum dot LED; the blue light chip structure and the red light chip are arranged at the bottom in the reflection cup shell; at least one blue light chip structure is arranged; at least one red light chip is arranged; the blue light chip structure comprises a blue light chip and a green light quantum dot fluorescent powder layer arranged on the blue light chip; and the blue light chip structure and the red light chip are formed into the quantum dot LED. The quantum dot LED backlight light source structure can effectively reduce the Cd content of quantum dot package LED backlight and can achieve the aim of quantum dot packaging structure meeting RoHS and high color gamut coverage.

The present invention discloses a method for rapidly treating organic waste, belongs to agriculture and aims to increase the efficiency of natural and synthetic calcium-rich substances by using silicon-rich materials in liquid or solid form. The method comprises the following steps of: preparing a mixture; adding water; culturing; and drying. The method can be used for preparing an efficient agricultural soil conditioner. Meanwhile, all negative effects of the organic waste on cultivated plants, soil and the environment are reduced, and the utilization efficiency of the organic waste is improved.

The invention discloses a method for restoring cadmium-polluted cultivated land by applying attapulgite materials and belongs to the technical field of cultivated land cadmium pollution treatment. The method comprises the following steps: 1, screening out the cadmium-polluted cultivated land; 2, measuring the soil pollution depth, the pH value, the cation exchange capacity and the like of the selected cadmium-polluted cultivated land, and calculating the earth volume of the cultivated land to be restored and the use quantity of the attapulgite materials which are prepared to be applied; 3, conducting cultivation on the cadmium-polluted cultivated land which is selected to be used for restoration tests, sowing paddy rice and wheat separately according to the timing sequence, applying the attapulgite materials before the paddy rice is sown, before paddy rice ears emerge and before the wheat is sown, conducting uniform sowing and application each time, and reserving vacant land for test result comparison; the pH value of the attapulgite materials is greater than 7.5, the grain size of each attapulgite material is smaller than 80 meshes, the cadmium content of the land is less than 0.15 mg / kg, and attapulgite CEC is greater than 250 mmol / kg. The method has the advantages of being low in cost, easy to operate, quick in effectiveness, great in practicability and the like; in particular, the problem of restoring cadmium-polluted soil in actual farmland can be solved.

The present invention discloses a heavy metal passivation composition and applications thereof. According to the heavy metal passivation composition, the active ingredients comprise zeolite, red mud and a silicon-potassium fertilizer, and the heavy metal passivation composition comprises, by mass, 20-30 parts of zeolite, specifically 25 parts, 20-30 parts of red mud, specifically 25 parts, and 5-15 parts of a silicon-potassium fertilizer, specifically 10 parts. The present invention provides the heavy metal passivation composition comprising the active ingredients such as zeolite, red mud and a silicon-potassium fertilizer. According to the present invention, the test results show that the steel slag can significantly reduce the Cd content in the plant; and the heavy metal passivation composition can be suitable for various crops and fruits and vegetables, is especially suitable for reducing the content of the heavy metal Cd in rice and Chinese cabbage, and has important application value.

The invention discloses application of cold plasma seed treatment methods. The application has the advantages that crop seed germination and seedling growth can be promoted under heavy metal cadmium stress, the crop yield can be increased, and the content of heavy metal in edible parts of cereal crops can be reduced; the yield can be increased by 12.4%-38.9% by means of cold plasma seed treatmentafter paddy rice grows in soil with the cadmium pollution concentration of 1.66 mg / L and is harvested, and the content of Cd in brown rice can be reduced by 4.1%-33.8%; the content of Cd in grains canbe reduced by 5.6%-23.8% by means of cold plasma seed treatment after wheat grows in soil with the cadmium pollution concentration of 0.51 mg / L and is harvested.

The invention discloses a soil management method for safe production of rice in a rice field seriously polluted by Cd and application of the method, and relates to the technical field of polluted farmland treatment. The soil management method comprises the steps of soil passivation treatment before rice transplantation and water management at a corresponding growth period after rice transplantation, and the rice can be reasonably planted in the rice field seriously polluted by Cd; meanwhile, the content of soil-available Cd is obviously reduced, the absorption of Cd in the growth process of the rice is inhibited, and rice grains which meet the requirements of national food safety are harvested while the yield of the rice is guaranteed.

The invention relates to the technical field of soil passivating and repairing materialsr, in particular to a passivator for repairing soil heavy metal Cd pollution and a preparation method thereof. The passivator for repairing the soil heavy metal Cd pollution is prepared from fly ash, diatomite, montmorillonite and quick lime, industrial solid waste fly ash generated by coal combustion is used as a main body material synthesized by the passivator ; clay mineral diatomite and montmorillonite are used as auxiliary materials for synthesis of the passivator; quicklime is used as an accelerant for synthesis of the passivator. The four materials are uniformly mixed according to a certain composition ratio and then a chemical thermal compounding reaction is performed and then the passivator forrepairing soil heavy metal Cd pollution can be obtained; the prepared passivator is low in price, simple in synthesis process, easy to produce in large scale, convenient to apply and popularize on alarge scale, small in application amount and excellent in passivating and repairing effect, and the environment-friendly concept of treating pollution with waste is achieved through recycling of industrial solid waste.

The invention relates to a plant combination repairing method for severely-cadmium-polluted paddy soil, and belongs to the technical field of prevention of soil heavy metal pollutions. The method is characterized in that firstly, a plant combination for repairing comprises six plants including reeds, herbs of alligator alternanthera, wild rice shoots, panicum crus, sheathed monochoria herbs and globose zosasa; secondly, according to a plant plating method, the plants of different varieties and heights are planted at intervals, and the interval between the plants is 20cm; and thirdly, in the plant harvesting period, according to the harvesting method, after the plants are planted for 50 days, and the amount of absorbed and extracted Cd reaches the saturation condition, harvesting is carried out at one time, and the whole plants are rooted out and are subjected to centralized treatment. In the paddy soil heavy Cd polluted area (the Cd concentration of the soil is 1mg / kg, and reaches more than three times of the limiting value of the soil Cd content of the edible agricultural product producing area), through three-turn plant repairing which lasts about 150 days, the Cd content of the paddy soil can be repaired to meet the edible agricultural product producing area soil quality standard (the Cd concentration of the soil is smaller than 0.3mg / kg) of the China.