213results about How to "Reduce nitrate levels" patented technology

The invention provides an efficient active bio-organic fertilizer produced by using livestock manure and a preparation method thereof. The preparation method comprises the following steps: pre-treating the livestock manure, straw and peat; mixing the livestock manure, straw and peat at a weight ratio of (3-5):(1-2):(1-2); adding a composite ageing bactericide based on the condition that the weight ratio of the mixture to the high-concentrated organic material ageing bactericide is (5000-10000):(1-2), evenly mixing, and then carrying out composting fermentation for 7-10 days, wherein during the composting fermentation, the material needs to be stirred 1-2 times each day; and mixing the material decayed by fermentation with a functional composite bactericide which is generated by single fermentation at a weight ratio of (5000-1000):(1-2), granulating and drying at low temperature so as to obtain the high-efficiency and active bio-organic fertilizer. The process is relatively simple, is easy to operate, and can be used for lowering the product cost is low, saving energy and turning wastes into wealth, thereby being beneficial to promotion of benign ecological circulation and environment conservation; and by utilizing the fertilizer, the quality of the product is good, thereby obviously improving the yield and quality of agricultural products.

The present invention is one kind of soil improving agent for vegetable plot and its preparation process and application, and belongs to the field of soil improving microbe preparation technology. The soil improving agent consists of turf, diatomite, microbe preparation, peanut cake and fly ash, and its microbe preparation includes Bacillus subtilis fermenting liquid, actimomycetale fermenting liquid and trichoderma fermenting liquid in the weight ratio of 1 to 0.5-3.5 to 0.5-6. It is applied to soil after being mixed in the field, can improve soil, and raise crop yield and quality obviously.

A nutritive medium for ecologically culturing plant is prepared from powdered coal ash, strew and stalk, fermented plants, and other nutritive, water-saving and rooting components. It can increase survival rate and yield of crops.

A process for recovering potable water from the exhaust gases of an internal combustion engine is disclosed. In this process the exhaust gases are cooled causing water to condense out, and the water formed is passed through particulate filters, activated carbon filters and ion exchange resin filters. In this process, the water is treated to reduce the levels of nitrates, sulfates, acidic and other organic components therein (for example, by passing it through a flow through capacitor) before the water is passed through the ion exchange resins. The apparatus for practicing this process is also disclosed.

The invention discloses an organic ecological soilless culturing method for black cabbages. The method comprises the following steps: (1) preparing a substance; (2) sowing and raising seedlings; (3) planting seedlings; and (4) maintaining in later period, wherein the substrate is prepared by mixing sawdust, mushroom residues and pearlite at a volume ratio of 4:4:2 and then adding 10kg chicken manure and 5kg cake fertilizer in each cubic meter of the mixture. The organic ecological soilless culturing method for black cabbages has the advantages that production cost of black cabbages is lowered, environmental pollution is reduced and yield and quality of the black cabbages are promoted. The organic ecological soilless culturing method meets national conditions and is in accord with the direction of agricultural continuous development.

The invention discloses a multifunctional compound fertilizer additive and a preparation method thereof. The preparation method comprises the following steps: uniformly spraying a compound amino acid complex solution of trace elements containing Fe, B, Mn, Cu, Zn and Mo, rare earth elements containing Ce and La and beneficial mineral elements containing Ni, Co and Ti on grass carbon, brown coal or weathered coal powder, airing or drying, and then crushing to obtain a material A; preparing dicyandiamide used as a nitrification inhibitor into an ammonia solution to be adsorbed on carboxymethyl cellulose used as a water retention agent, airing or drying, and then crushing to obtain a material B; mixing cobalt sulfide and molybdenum sulfide which are used as nitrogen fixation catalysts with bean cakes or corn starch to obtain a material C; and uniformly mixing the material A, the material B and the material C to obtain the additive. The multifunctional compound fertilizer added with the additive of the invention has the advantages of fixing nitrogen, dissolving phosphorus, enriching soil, reducing nutrient loss, improving nutrient utilization ratio, improving crop enzyme activity, promoting metabolism, improving crop quality, increasing crop yield, retaining water, saving water, resisting drought, regulating buffering acidity or saline-alkali soil, and improving soil structure.

The invention discloses a compound microecological preparation used for water body purification of aquaculture. The compound microecological preparation is prepared by taking photosynthetic bacteria, bacillus amyloliquefaciens and denitrifying bacteria thalli as active constituents with a volume proportioning of 1:2:1 of fermentation liquors of the photosynthetic bacteria, the bacillus amyloliquefaciens and the denitrifying bacteria thalli. The invention is characterized in that the compound microecological preparation can obviously reduce the content of substances of ammonia nitrogen, nitrate nitrogen, nitrite nitrogen, COD and the like, in aquaculture water body. In the invention, strains have many types, rich quantity and strong environmental adaptivity, the three contained bacteria are all live bacteria; and the strains contain rich protein and vitamin and can also secrete multiple types of enzymes and anti-bacteria substances to promote cultivated living beings to grow and improve immunity of the cultivated living beings. Therefore, the invention can not only effectively purify the aquaculture water body, promote beneficial algae to reproduce and improve water body ecological environment, but also improve yield and quality of fish and shrimp; moreover, the invention is harmless to people and livestock, and can be produced in scale to be used for improving aquaculture environment.

The invention discloses a synergist of a functional fertilizer, comprising the following raw materials by weight: 0-150 portions of compound amino acid, 0-24 portions of plant growth regulator, 0-18 portions of synergistic sodium, 0-18 portions of a-nafusaku, 0-3 portions of antidote, 0-4 portions of pesticide, 0-600 portions of magnesium sulfate, 0-600 portions of nano calcium, 0-10 portions of zinc sulfate, 0-5 portions of ammonium molybdate, 0-15 portions of boric acid, 0-364 portions of adsorbent and 193-800 portions of bond. The preparation method comprises the following steps according to three proportions: adding water for mixing, rubbing, cutting, pelletizing, polishing, drying, cooling and screening, and then mixing the screened products with particle diameter less than 1 mm madeby three different proportions after equal part measuring by a computer, measuring, packaging and obtaining products. The invention can be used after mixing with a normal fertilizer easily and is suitable for various crops and soils, climates and different ways of fertilizing, thereby reducing the use level of the fertilizer and improving the utility ratio of the fertilizer. The invention has theadvantages of low use level, quick returns, stable fertilizer effect and long duration.

The invention discloses a soil conditioner for treating saline-alkali soil, and belongs to the technical field of agricultural production. The soil conditioner is prepared by diatomite, attapulgite, halophilic bacteria, humic acid, fulvic acid and biological floras, 300 kilograms of water is added into fungi in the biological floras to prepare an aqueous solution, and the diatomite, the attapulgite and the halophilic bacteria are added into the aqueous solution; then the humic acid and the fulvic acid are mixed to be added into the aqueous solution to be mixed, and therefore particles are obtained. In tillage, the soil conditioner is applied along with bottom fertilization in soil turning, and can promote rapid growth of crops and increase the yield and incomes, and the quality of fruits is remarkably improved.

The invention relates to an agricultural waste recycling technology and a soil fertilizer technology, in particular to a blended facility vegetable field soil conditioner taking charcoal as a matrix and a preparation method thereof. The blended facility vegetable field soil conditioner comprises the following components in percentage by weight: 60 to 80 percent of charcoal, 5 to 15 percent of medical stone powder, 5 to 15 percent of zeolite powder and 5 to 15 percent of lime nitrogen. The method for preparing the soil conditioner comprises the following steps of: mixing and stirring the medical stone powder which is sieved with a 60-mesh sieve, the zeolite powder which is sieved with a 60-mesh sieve and the granular lime nitrogen uniformly, mixing the mixture with the charcoal, and stirring uniformly to prepare the soil conditioner. The method is simple and pollution-free, the volume weight of soil can be reduced, the buffer performance of the soil can be improved, the utilization rate of fertilizer nitrogen and phosphorus can be improved, and an effect of preventing and controlling soil-borne diseases is achieved.

The invention relates to a soil fertilizer technology and a crop disease and insect pest control technology, in particular to a disease-resistant synergy-type conditioner of protected horticultural vegetable field soil and a preparation method thereof, solving the problem that sustainable utilization of protected horticultural vegetable field is affected by the lowering soil quality. The soil conditioner comprises the following components in percentage by weight: 30-50% of medical stone powder, 20-30% of lime nitrogen, 20-30% of lignite, 5-10% of zeolite power and 5-10% of dicyandiamide. The preparation method of the soil conditioner comprises the following steps: medical stone powder screened by a 60-mesh screen, zeolite powder screened by a 60-mesh screen, the dicyandiamide and lignite are mixed and evenly stirred; then the mixture and granular lime nitrogen are mixed and evenly stirred; and after being completely mixed, the mixture is prepared into the soil conditioner. The preparation method of the invention is simple, has no pollution, can obviously improve fertilizer nitrogen and phosphorus utilization ratio of the protected horticultural vegetable field, effectively prevent and cure soil-borne diseases and has the effect on improving physical and chemical properties of soil at the same time.

The invention discloses a soilless cultivation method capable of reducing nitrate of lettuce leaves, and aims to overcome the problem of the prior art that the content of nitrate of lettuce leaves is higher. The method comprises the following steps: 1, soaking and sprouting seed; 2, seeding in a manual climatic box: 1) positioning a plastic nutrition pot in which the seed is sown in the manual climatic box, the temperature in the daytime is DEG C, the intensity of illumination is 5-6 grade, the temperature at night is 15-20 DEG C, the intensity of illumination is 0 grade, the relative humidity is 70-80% RH; 2) after that the lettuce, pakchoi and cherry radish grows for true leaves for 3 pieces or 4 pieces, the height of the pea seedling is 5-6cm, preparing to transplant seedlings; 3) in order to transplant the crops at the same time, growing seedlings for the lettuce, pakchoi and cherry radish at the same batch, and growing pea seedling after 15 plus / minus 1 days; 3, transplanting seedlings; 4, preparing before fixed planting; 5, fixed planting; 6, setting cultivation environment; 7, adjusting pH and conductivity EC value of the nutrient solution in the aerosol cultivation box; 8, harvesting plants.

The invention relates to a long-acting slow release fertilizer special for tomatoes and a preparation method thereof. The long-acting slow release fertilizer special for tomatoes disclosed by the invention comprises the following components in parts by mass: 230 parts of nitrogen fertilizer active ingredients, 120 parts of phosphorus fertilizer active ingredients, 10 parts of potassium fertilizeractive ingredients, 92-100 parts of bentonite and 7-9 parts of a long-acting compound fertilizer additive, wherein the bentonite contains 85-90 percent by mass of montmorillonite; and the long-actingcompound fertilizer additive comprises the following components in parts by mass: 2-8 parts of quinhydrone, 3-25 parts of dicyandiamide, 0.1-0.8 part of complex rare earth and 70-95 parts of zeolite powder. The invention further provides a preparation method of the long-acting slow release fertilizer special for tomatoes. By applying the long-acting slow release fertilizer special for tomatoes disclosed by the invention, crop yield is increased by over 20 percent, and quality is enhanced remarkably. Nitrogen utilization ratio and phosphorus utilization ratio are increased greatly; and moreover, the long-acting slow release fertilizer special for tomatoes disclosed by the invention is safe for human beings, livestock and crops, and residues in soil and crops are avoided.

The invention discloses a device and a method for a sewage treatment plant to distribute an influent carbon source. The device is provide with a water storage tank, a pre-anoxic tank, a valve A and a valve B, an electric control valve, a controller and a on-line nitrate instrument, wherein the water storage tank is provided with a water outlet pipe, the on-line nitrate instrument is arranged in the aeration tank of the original sewage treatment equipment, the controller is connected with the on-line nitrate instrument through signal, and is controlled by and connected with the electric control valve. The device is matched with the original sewage treatment equipment; the method comprises setting the retention period of the water in the pre-anoxic tank, adjusting the water intake ratio between the pre-anoxic tank and the anaerobic tank, etc. The device and the method are applied to the matching application of the A<2> / O sewage treatment process, and the raw water carbon source is saved and reasonably used to ensure the sewage treatment effect to be better.

The invention relates to a beneficial biological bacterium fermented microbial organic fertilizer to solve the problem of harms of organic wastes to the environment. The beneficial biological bacterium fermented microbial organic fertilizer is prepared through fermenting raw materials by beneficial biological bacteria, and the raw materials comprise, by weight, 10-15% of active humic acid, 3-9% of a nitrogenous fertilizer, 1.5-4.5% of a phosphate fertilizer, 1.5-4.5% of a potash fertilizer, 1-3% of a boron fertilizer, 0.5-1.5% of a silicon fertilizer, 0.3-0.7% of an iron fertilizer, 0.3-0.7% of a zinc fertilizer, 0.3-0.7% of a copper fertilizer, 0.2-0.4% of a magnesium fertilizer, 0.2-0.4% of a manganese fertilizer, 0.3-0.7% of a calcium fertilizer, 0.3-0.7% of a molybdenum fertilizer, 0.3-0.7% of a vanadium fertilizer, and the balance of an organic matter ferment material (metered by dry weight). The beneficial biological bacterium fermented microbial organic fertilizer has the advantages of low production cost, soil improvement, improvement of the quality of crop products, improvement of the output of the crops, promotion of development of the agriculture with Chinese characteristics, high harmless degree, absorption facilitation, slow synergism, yield and income increase, soil fertility raising, and balanced nutrition, and is helpful for naturally decomposing various beneficial components in soil after being applied in order to make the decomposed beneficial components be absorbed and utilized by plants.

The invention discloses a bio-organic fertilizer with plant straw as a substrate; the bio-organic fertilizer is composed of the following components in parts by weight: 90 parts of the plant straw, 4 parts of a nutrition enhancer, 1 part of a compound microbial strain A, 1 part of a composite enzyme mixed liquid, and 3 parts of a composite microbial strain B. Moreover, the invention particularly discloses a method for preparing the bio-organic fertilizer; the bio-organic fertilizer has extremely high humic acid content, also contains rich amino acids and organic matters, has a biological insecticidal function on lepidoptera, has wide use scope, and has good effect on crop growth.

A method of treating wastewater to increase effluent volatile fatty acid content consisting of providing wastewater to a primary treatment vessel and adding a select quantity of a chemical, typically an aluminum or iron salt, to the wastewater, enhancing the separation of organic matter. Separated organic matter is then removed from the chemically treated wastewater forming a primary sludge and a primary effluent. A portion of the primary sludge is fermented to form a volatile fatty acid rich liquor. The volatile fatty acid rich liquor may then be used with the primary effluent, directed to a bioreactor, thereby forming a volatile fatty acid enriched bioreactor feed. The volatile fatty acid enriched influent may be further treated through known biological phosphorous and nitrogen removal methods.

The invention provides a bioactive organic pesticide-added fertilizer. The bioactive organic pesticide-added fertilizer contains 12-15% of total nutrients, wherein the mass ratio of N to P2O5 to K2O is (3-6) to (0-2) to (5-7); the living bacteria count in the bioactive organic pesticide-added fertilizer is 50 million / g to 100 million / g; besides, the bioactive organic pesticide-added fertilizer contains 60%-75% of organic matters, less than or equal to 30% of moisture and 0.2-0.3% of nicotine, has the fineness of 20-40 meshes and the pH of 6.0-7.0. The preparation method of the bioactive organic pesticide-added fertilizer comprises the following steps: adding tobacco stems, cake meal and a microbial fermentation agent into a material mixer, adding water while mixing, and composting the materials for fermentation to obtain the fermented and decomposed materials; next, adding the fermented and decomposed materials and a functional microbial agent into the mixer, mixing evenly and crushing, screening to obtain powder and packaging to obtain a finished product. The bioactive organic pesticide-added fertilizer does not contain inorganic nutrients or chemical additives, and contains a plurality of soil active microorganisms, and is capable of effectively solving the problems of soil hardening and the like, capable of improving the soil structure and controlling diseases and pests, and enhancing the utilization of the nutrients caused by the crops.

The invention discloses a cultivation method of leaf vegetable with low nitrate content. The method comprises the following steps: A, land preparation: turning over the soil, ditching and ridging; B, fertilization: applying chemical nitrogenous fertilizer potassium, wherein 100 kg of N, 50 kg of P and 50 kg of K are applied to each hectare; C, seeding: seeding the sprouted vegetable seeds into the fertilized soil after the land preparation; D, watering: watering and covering the soil with a thin film or sunshade net after the seeding; E, spraying plant physiological regulator: spraying the prepared plant physiological regulator in the growth period of vegetable, once every week and three in total; F, prevention and control of disease, pest and grass: spraying liquid medicine for preventing disease and killing pest, and weeding in the vegetable plot; and G, harvesting: harvesting the ripe crops. The method is easy to implement and convenient to operate, and has low cost; the plant physiological regulator has good effect and is convenient to use and widely applicable; and moreover, the method is widely applicable to the planting of leaf vegetable in the same type of vegetable plot soil, reduces nitrate content of leaf vegetable, improves the vegetable quality and the soil quality, and prevents widespread pollution caused by excessive soil nutrient.

The invention provides a planting system and a planting method for controlling the temperature of vegetable roots; wherein the system comprises a hydroponic planting nutrient solution pool and a nutrient solution sterilization temperature-control trough; the nutrient solution sterilization temperature-control trough is arranged beside the growing period hydroponic pool, is internally provided with a precise filter, a nutrient solution cooling group, a temperature sensor group and an electric heater heating group and is externally provided with a condensation compression unit that is connectedwith the nutrient solution cooling group; and a ultraviolet sterilization device is arranged above the nutrient solution sterilization temperature-control trough. The method comprises the following steps of: planting the hydroponic vegetable in the planting system for controlling the temperature of the vegetable roots; opening the nutrient solution valves arranged at two sides of the planting pool by the temperature-control planting system; pouring the nutrient solution into the nutrient solution sterilization temperature-control trough; filtering the solution by a precise filter; reducing the temperature when the solution flows by the nutrient solution cooling group subsequently or increasing the temperature by the electric heater heating group so as to lead the temperature of the nutrient solution to be kept at about 18 DEG C in summer and at about 22 DEG C in winter and lead the temperature of the vegetable plant to be reduced or increased, thus leading the vegetables to have the capability of resisting hot or cold weather.

The invention relates to a superoxide dismutase radish and the preparing method, seed dressing with SOD special-purpose agent for radish before sowing, managing according to normal planting management condition, spraying with 800-1200 times solution of the SOD special-purpose agent 15 days after the emergence of seedlings, one time for per 15-20 days, and for 4-6 times, then getting the fruit. Employing Yiwei SOD special-purpose agent on radish, and increasing the SOD activity and content in radish through the breeding and shifting of the good endogenetic bacillus in radish. The SOD radish maintains the good property of the regional radish, but the SOD content is obviously increased, which can improve the human immunity and delaying aging, for which the market prospect of the SOD radish is bright , and the radish fits the developing direction of green food and functional food. The radish maintains high SOD activity by employing the special-purpose SOD agent, and also can maintain high SOD activity during additional processing.

The invention provides drought-resisting efficient composite fertilizer special for Chinese cabbage growing. The fertilizer is prepared from plant straw, humic acid, urea, diammonium phosphate, potassium sulfate, medical stone, animal waste, coal ash, EDTA calcium, egg shells, palygouskite, Chinese herbal medicine powder and fungicide. The fertilizer can promote assimilation of Chinese cabbages to nutrient, so that the utilization rate of the Chinese cabbages to the nutrient of the fertilizer is increased; meanwhile, as the Chinese herbal medicine powder is added, the Chinese herbal medicine is utilized for providing rich nutritional ingredients and trace elements for the Chinese cabbages, the nitrate content of the Chinese cabbages is reduced, and insecticide ingredients in the Chinese herbal medicine can prevent downy mildew; meanwhile, the calcium element is added, so assimilation of the Chinese cabbages is promoted, which is beneficial for storing the Chinese cabbages.

A method of treating wastewater to increase effluent volatile fatty acid content consisting of providing wastewater to a primary treatment vessel and adding a select quantity of a chemical, typically an aluminum or iron salt, to the wastewater, enhancing the separation of organic matter. Separated organic matter is then removed from the chemically treated wastewater forming a primary sludge and a primary effluent. A portion of the primary sludge is fermented to form a volatile fatty acid rich liquor. The volatile fatty acid rich liquor may then be used with the primary effluent, directed to a bioreactor, thereby forming a volatile fatty acid enriched bioreactor feed. The volatile fatty acid enriched influent may be further treated through known biological phosphorous and nitrogen removal methods.

A formentation bacterial agent for processing agricultural waste is composite or single bacterial agent prepared by cultivating and fermenting three bacterial agents of retaining cupsule film spoyeast ZJY2, griseolutein W, and cerecin ME1-2. The application process includes controlling water content rate of waste to be 55-56%, adding and mixing the agent, stirring the mixer for ventilation at setting time for 20-30 days and achieving the aim of making the waste nonhazardous and resources.

The invention discloses a cultivation method of pitayas and belongs to the technical field of agricultural planting. The cultivation method includes screening varieties, raising seedlings by cutting, preparing soil and setting posts, planting, irrigating and fertilizing, controlling diseases and pests, performing field management and the like. The cultivation method has the advantages that the space of a pitaya planting base is optimized, pitaya cultivation racks in rows are utilized to increase pitaya planting density, an interval of 2.5-2.8m is reserved between every two planting ridges to serve as the passageway for manual and mechanical operation, manpower cost and management cost can be lowered, high pitaya yield and good pitaya quality are achieved, the produced pitayas are rich in selenium content and meet the requirements of selenium-rich fruits, and the method is suitable for being popularized and used in a large-scale manner.

The pakchoi fertilizing method capable of reducing nitrate content in pakchoi includes the following steps: applying base fertilizer of organic fertilizer before transplantation of pakchoi seedling to provide N in 3-12.2 kg, P 1.6-6.3 kg, K 2.3-9.2 kg, Ca 2.9-11.5 kg, Mg 0.7-2.8 kg, B 3.3-13.4 g and Mo 0.16-0.64 g each mou; applying inorganic fertilizer as top dressing for four time to provide N in 5-15 kg, P 0.9-2.4 kg, K 3.3-9.6 kg each mou; and adding Mo containing inorganic fertilizer to the base fertilizer or top dressing. The said method can reduce the nitrate content in pakchoi by 34-60 % while increasing yield of pakchoi, and the soluble sugar and vitamin C contents of pakchoi.

The invention relates to a soil conditioner, in particular to a soil conditioner for conditioning the polluted soil by the nitrate in greenhouse vegetable, and a preparing method thereof, which solves the problems that the content of the nitrate in vegetable is higher. The soil conditioner comprises the following materials according to the weight percentage: 1.0 to 2.0 percent of nitrification inhibitor cyanamide dimmer (DCD), 1.0 to 2.0 percent of 3,4-dimethyl pyridine phosphate (DMPP), 45 to 52 percent of natural zeolite, and 45 to 52 percent of lignite calculated. The preparing method for soil conditioner comprises the following steps: the nitrification inhibitor DCD, DMPP and the natural zeolite powder are uniformly mixed, then the mixture is mixed with the lignite and sufficiently stirred, and prepared into the soil conditioner after being uniformly mixed. The soil conditioner and the preparing method have the advantages that the method is simple, the soil conditioner is pollution-free, the content of the nitrate in the greenhouse vegetable can be remarkably reduced, the soil physical and chemical characteristics can be improved, the content of the nitrate in the vegetable can be reduced, and the product quality of the greenhouse vegetable can be enhanced.

The invention relates to a method and device removing nitrates from a water body by single-stage autotrophic denitrification. In a biological filter, haydite is used as a filtering medium for attached growth of denitrifying microorganisms. A (sodium thiosulfate, sodium sulfite and sodium sulfide) solution is added in influent water of the biological filter to supplement electron donors required by denitrification, and purified water flows into the lake surface water body. By using single-stage autotrophic denitrification, the invention can quickly and efficiently remove nitrates in the water body, thereby enhancing the quality of the treated water and lowering the probability of eutrophication in the receiving lake water body.

The invention discloses a preparation method of a double-control slow release multi-element coating composite fertilizer. The method comprises the following steps: by using a low formaldehyde urea formaldehyde-oxidized starch composite material as an adhesive, compounding with diatomite to form a slow release system; reasonably proportioning a slow release nitrogen fertilizer, a quick-acting nitrogen fertilizer, a phosphate fertilizer or a potassium fertilizer; and preparing the low formaldehyde urea formaldehyde-oxidized starch-diatomite-based slow release fertilizer by virtue of an integrated technique of extruding and mixing reaction, vibratory screening and disc granulation. The fertilizer which is applied to soil can be fully biodegraded and is environment-friendly, not only can satisfy the demand on granular production of the compound fertilizer, but also can control release of the compound fertilizer, so that the utilization ratio of the fertilizer is improved.

The invention provides a method for repairing vegetable garden soil cadmium pollution. Nano-zeolite with the soil weight being 0.5% to 1.0% and nano-magnesium hydroxide with the land fertilizer amount being 0.1% to 0.5% are used and are sufficiently and evenly mixed with soil through broadcasting, furrow dressing and hole application, the soil turning depth ranges from 15 cm to 20 cm, and after balance is conducted for 5 days to 7 days, vegetables or other crops are transplanted. According to the method, multiple repairing technologies such as in-situ passivation, plant repairing and microorganism repairing are organically combined, and soil Cd pollution is effectively repaired through a synergistic effect.