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

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 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 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 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 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 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 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 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 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.