56results about How to "Does not affect normal growth and development" patented technology

The method includes steps: using imaging device of biomedicine obtains layered sequence images in situ of root system of plant grown at different opaque medium. Processing and analyzing the sequence images obtains spatial geometrical characteristic parameters in situ of root system of plant. Based on the said parameters, model of solid geometry is built. 3D visualized reconstruction is carried out for model of solid geometry so as to build 3D display model of root system. Features are: obtaining images in situ of root system of plant precisely and in non-destructive, sampling procedure is simplified so as to save labor to separate soil, greatly raised accuracy.

The invention belongs to the technical fields of crop nutrition diagnosis and fertilization, and in particular relates to a fertilizing method based on nitrogen nutrition nondestructive detection of winter rapes. The fertilizing method is characterized by comprising the following steps: testing a SPAD value by selecting the key growing period and time of the rapes, determining the sensitive leaf position and leaf part subjected to the nitrogen nutrition detection, establishing a critical leaf SPAD value detection method, carrying out real-time nitrogenous fertilizer topdressing by virtue of obtained detection values, and the like. The fertilizing method disclosed by the invention can be used for evaluating and detecting the nitrogen nutrition sufficiency and deficiency level of the rapes relatively accurately; and compared with a conventional laboratory chemical analysis method, the method, as a nondestructive rape nitrogen nutrition status detection and fertilization method, is real-time and rapid.

The invention discloses application of monopotassium phosphate to reduce rice cadmium accumulation. The application disclosed by the invention is as follows: monopotassium phosphate is applied to soil in the event of preparing a land before transplanting rice; or / and monopotassium phosphate is sprayed to the upper parts of rice after transplanting rice till maturing. According to the invention, novel application of monopotassium phosphate is provided; monopotassium phosphate is capable of effectively controlling cadmium accumulation in rice; monopotassium phosphate is capable of respectively reducing cadmium contents in rice cadmium high-accumulation rice Yongyou 9 and rice cadmium high-accumulation rice Xiushui 09 brown rice to be above 80% and 85% maximally; the cadmium contents in brown rice are only 0.04 mg / kg and 0.02 mg / kg and are far below nationally regulated 0.2 mg / kg; a good solving way is provided for rice heavy metal pollution; furthermore, both the application number and the application amount of monopotassium phosphate are very low; the application disclosed by the invention is low in cost and convenient for operation.

The invention provides a method for rapidly detecting the nutrient content of a plant, in particular the nutrient content of a soybean polygene polymerization breeding filial generation. The method comprises the following steps of: extracting primary samples of substances, such as a water-soluble substance, namely, isoflavone and fat-soluble substances, namely, vitamin E, xanthophyll, carotene and the like at the same time; and performing a high performance liquid chromatography (HPLC) two-step analysis method to realize synchronous analysis and detection of various functional nutrients through primary samples. Therefore, the method has the advantages of accelerating the selection process of breeding generations, cultivating a new soybean variety with a high added value, shortening detection time, reducing the investments on manpower, material resources and financial resources and reducing the pollution of wastes to the environment.

The invention relates to a mouse-typhus salmonella gene-deletion mutant strain without containing resistance marks, a vaccine and application thereof, belonging to the technical field of animal bacterium genetic engineering. The invention utilizes a mediated allelic exchange technique of recombinant suicidal plasmid for obtaining the mouse-typhus salmonella gene-deletion mutant strain (Salmonellatyphimurium SL13441) (the preservation number is CCTCC NO: M2010301) without containing the resistance marks. The mutant strain is deficient in an important toxicity regulating gene-cya gene in mouse-typhus salmonella, so that the toxicity of the mouse-typhus salmonella is obviously weakened after the deficiency of the cya gene, but the mouse-typhus salmonella still has immunogenicity. The invention also discloses the Salmonella gullinarum gene-deletion vaccine prepared by utilizing the gene-deletion mutant strain and an application of the gene-deletion mutant strain in preparing the vaccine, and the prepared vaccine meets the requirement on biological safety. The gene-deletion vaccine prepared in the invention can effectively prevent infection of Salmonella gullinarum and has the advantages of good stability and safety and low cost, is convenient to use and has obvious economic and social benefits.

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.

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.

Rosa multiflora flower tea is prepared from wild rosa multiflora serving as raw materials, the wild rosa multiflora grows in the mountain area of north China, and processes of picking, impurity eliminating, baking, drying and the like are carried out. Taking the wild rosa multiflora as the raw materials, the rosa multiflora flower tea has no pollution and belongs to a natural organic food. The rosa multiflora flower tea prepared by the method of the invention has a rose-like shape, pure and long aroma, and mellow mouthfeel and taste. With a simple production technology and a low-temperature and short preparation process, the rosa multiflora flower tea remains many kinds of nutrient components which are easy to oxidize and have health care functions in the raw materials. The raw materials of the rosa multiflora flower tea is widely distributed in north China, easy to pick and low in cost, besides, the picking of flowers does not affect the normal growth and development of plants. The rosa multiflora flower tea has simple production equipment and operation, and is easy to popularize and beneficial to the economy and society.

The invention belongs to the technical field of plant protection and particularly relates to a simple and efficient field inoculation method for a rice false smut germ. The method comprises the steps: picking rice false smut balls from rice ears in a rice field at a rice ripening period in last year, drying the rice false smut balls in the air indoors, loading the dried rice false smut balls into plastic bags or plastic bottles, and placing the plastic bags or plastic bottles ay an indoor shady place; and at a 3-4 stage of young panicle differentiation of rice, putting the rice false smut balls preserved in last year into clean water, carrying out soaking for 3-5 hours, then, carrying out oscillating so as to enable rice false smut powder on the outside surface of each rice false smut ball to gradually fall off until rice grains are clearly discernible, then, enabling the rice false smut powder to be completely scattered into water, carrying out filtering with gauze so as to filter off grain residues and other foreign bodies, then, pouring filter liquor into a sprayer, adjusting water volume according to a spraying area, directly spraying the filter liquor to fields at 10 am to 5 pm in a sunny day, and swinging the sprayer during spraying so as to achieve uniform spraying as far as possible. By adopting the method disclosed by the invention, the onset ear ratio of field artificial inoculation of rice false smut can reach about 30% and is extremely stable. The method disclosed by the invention is extremely simple and can be used for carrying out field identification on degree of disease resistance to rice false smut of rice varieties without special utensils and conditions.

The invention discloses a method for controlling rice heavy metal mercury accumulation by salicylic acid. The method is characterized by sequentially comprising the following steps that (1) after the soil preparation, rice seedlings are transplanted; (2) the salicylic acid is prepared into a water solution with the concentration being 1 to 50mg / L, after 7 to 21 days of the rice transplanting, on the 1st to 7th days of the jointing period, the 1st to 7th days of the flowering period and the 7th to 21st days of the flowering period, the salicylic acid solution is sprayed on leaf surfaces by a sprayer, and 3L salicylic acid solution is uniformly sprayed in each region with the dimension being 3.5m*4.0m. Through the spraying of the salicylic acid solution with the proper concentration in each growth period of the rice, the mercury contents of the produced rice are respectively reduced by 30 percent to 60 percent, and in addition, a conventional agricultural method can be adopted for soil preparation, seedling culture, transplanting and field management in the rice production process.

The invention relates to an antibiosis pest-resistant packaging membrane used before fruit harvest, which belongs to the field of agricultural product insecticidal degerming. The antibiosis pest-resistant packaging membrane comprises the following components in parts by mass: 100 parts of a base material, 1000-3000 parts of deionized water, 1-50 parts of an antiseptic, 2-30 parts of a plasticizer, 2-40 parts of an auxiliary agent, and 3-60 parts of an emulsifier. The preparation method comprises the following steps: the components are metered according to the above formula, then dissolved and blended at the temperature of 30-100 DEG C, then the material is cooled, and the product is sprayed through hydraulic equipment to the fruit trees in a spray form for forming the membrane. The membrane has the advantages of good biodegradability, mechanical property, obstruct performance and antibacterial property, and can substitute pesticides and fruit tree sleeve bags in the field of agricultural product insecticidal degerming.

The invention discloses a tissue engineering bone for repairing a cleft palate defect of a maxillofacial region and a preparation method. The tissue engineering bone comprises a double-layer porous scaffold and hydrogel, wherein pores of the scaffold are filled with the hydrogel. The double-layer degradable tissue engineering bone prepared by the preparation method is completely matched with the cleft palate defect of a patient, and can accurately restore the original palate structure and function of the patient, so that a series of problems such as donor site trauma, malformation, scars and pain caused by current autogenous bone transplantation and inevitable defects such as limited sources are avoided; and meanwhile, the tissue engineering bone is degradable, so that normal growth and development of the jaw bone are not affected.

The invention discloses a method adopting sodium nitroprusside for controlling rice heavy metal mercury accumulation. The method sequentially comprises the following steps that (1) after the soil preparation, rice seedlings are transplanted; (2) the sodium nitroprusside is prepared into a water solution with the concentration being 1 to 50mg / L, the sodium nitroprusside solution is sprayed onto leaves by a sprayer on 7th day to 21st day after the rice transplanting, 1st day to 7th day in the flowering stage and 7th day to 21st day in the flowering period, and 3L of the water solution is uniformly sprayed in each 3.5m*4.0m region. The sodium nitroprusside solution with the proper concentration is sprayed in each growth period of the rice, so the mercury content of the produced rice is respectively reduced by 30 percent to 50 percent, and in addition, in the rice production process, agricultural conventional methods are respectively adopted for land preparation, seedling culture, transplanting and field management.

The invention discloses a disease prevention method of increasing the content of phenolic substance in strawberry fruit, and belongs to the technical field of crop cultivation. The method comprises the steps that the strawberry plants are UV-C irradiation treated once every 2-4 days beginning from the flowering period and continuing until the fruiting period; the conditions for the UV-C irradiation treatment are the following: the irradiation dosage amount is less than 0.75 kJ / m2, the irradiation time is less than 70 s; after the UV-C irradiation treatment is completed, the strawberry plants need to be shaded from light for larger than or equal to 8 hours. According to the disease prevention method, the strawberry plants are regularly UV-C irradiated in the flowering and fruiting period, the contents of anthocyanin and flavonol and other phenolic substances in strawberry fruits are significantly increased, meanwhile the antioxidant ability of the fruits is increased; the low dosage UV-C irradiation combined with light shading treatment method is utilized, physiological metabolisms related to the course of disease of the strawberry plants are induced, the anti-disease ability of the strawberry plant per se is effectively increased, and the incidence rate of the natural diseases of the strawberries is significantly decreased.

The invention provides a maintenance method for a garden landscape lawn. The maintenance method comprises the following steps: (1) laying plant ash onto the surface layer of soil when a lawn is established, then using salicylic acid to prepare a salicylic acid aqueous solution with a concentration of 0.5 to 1 mg / L, spraying the salicylic acid aqueous solution onto the plant ash, and sowing grass seeds in 5 to 7 days after the salicylic acid aqueous solution is sprayed; (2) uniformly mixing salicylic acid, citric acid, polyacrylamide, ferrous sulfate and magnesium sulfate with water so as to obtain a mixed solution which is used right after prepared, and respectively spraying the mixed solution once to the lawn before the lawn turns green in spring and before the lawn is withered and turnsyellow in autumn; and (3) uniformly mixing uniconazole, naphthaleneacetic acid, abscisic acid, ferrous sulfate and potassium dihydrogen phosphate with water so as to obtain a mixed solution which is used right after prepared, spraying the mixed solution once to a vigorously-growing cold-season lawn in spring, and spraying the mixed solution once to a vigorously-growing warm-season lawn in midsummer. The maintenance method provided by the invention has the advantages of preventing weeds from surviving, significantly increasing the content of chlorophyll and greatly reducing the number of timesof lawn trimming.

The invention discloses a rice planting method including the steps of soil preparation, rice seedling transplanting and field management. When the soil preparation is performed before rice transplanting, ferrous sulfate is applied in soil, or / and is sprayed to the overground part of rice 7-15 days after the rice transplanting, the first to tenth day of an elongation stage, the first to seventh day of an flowering stage and the seventh to 21st day after the flowering stage. According to the method, the ferrous sulfate is reasonably applied, so that the accumulation of cadmium in the rice is effectively controlled, cadmium contents in brown rices of the rice Yongyou No. 9 with high accumulation of cadmium and the rice Xiushui 09 with high accumulation of cadmium are respectively reduced by 79 percent and 86 percent maximally, and the cadmium contents in the brown rices respectively are only 0.05 mg per kg and 0.02 mg per kg, and far below 0.2 mg per kg of a national regulation. A good solution is provided for heavy metal pollution of rice, the applying times and amount of the ferrous sulfate are both less, the cost is low, and the operation is convenient.

The present invention discloses a method for improving the Guangzhou cherry blossom and China Red cherry blossom hybridization pollination setting rate. According to the present invention, different cherry blossom varieties having different flowering phases are adjusted to flower at the same period so as to ensure the freshness of the hybridization pollination pollen, improve the hybridization pollination setting rate, and improve the flexibility of male parent and female parent selection. According to the present invention, after the female parent is subjected to emasculation, the pollination is instantly performed, such that the operation is simple, and the female parent is prevented from damage during the multiple bagging and bag breaking processes; after completing the hybridization pollination, the white transparent slight thin plastic bag is used to sleeve, wherein the cherry blossom branch is slender and weak and easily droops after being sleeved by the kraft bag, and the cherry blossom branch is easily broken in the wind and rain weather so as to cause the pollination failure; and the white plastic bag of the hybridization fruit with the characteristic of primary pollination success is released, and the white nylon mesh bag with the compact meshes is used to sleeve, such that the normal growth development of the fruit is not affected, the bird foraging can be prevented, the united fruit harvest is easily achieved, and the large area hybridization pollination fruit ripening harvest efficiency is substantially improved.

The invention discloses an HZSN.J absorption-resistant film agent for preventing and controlling rice planthoppers and a preparation method thereof .The HZSN.J absorption-resistant film agent is prepared from, by weight, 4-6% of sodium alginate, 2-3% of polyvinyl alcohol PVA-124, 1-1.5% of nano white carbon black, 1-2% of sodium carboxymethylcellulose, 0.5-1% of sodium benzoate, 1-2% of organosilicone and the balance water .The preparation method comprises the steps of adding all components to water, mixing the components to be uniform, so that milk-white suspension is obtained; the milk-white suspension is the HZSN.J absorption-resistant film agent .After being diluted with water, the film agent is sprayed to the surfaces of rice stalks, a protective film layer which is difficult to see by naked eyes can be formed, the film layer is of a certain thickness and contains certain particulate substances, damage caused by pricking and suction of rice planthoppers can be prevented, in addition, pesticide consumption can be remarkably reduced, and it is helpful to protect the environment and food safety.

The invention discloses a suitable soil and tree inlaying forestation method, which comprises the following steps: firstly, analyzing and surveying different soil distributions in a forestation area according to the forestation area and selecting more than one tree seeds with different features for collocating according to different soil distributions; and then, preparing soil in a slope-separating counter-slope form and digging holes in separating slopes; and lastly, respectively sowing the selected tree seeds in different tree holes according to the soil classification, thereby finishing forestation. In the suitable soil and tree forestation manner, the survival rate of trees is greatly increased; the growth and development of the trees are boosted; and the tree cover degree and ecological repairing effect are increased. The method is strong in pertinence, simple and practical, low in cost, free from damaging environment and influencing the normal growth of the trees and especially suitable for application and usage in a loess plateau area.

The invention discloses wonton chocolate. The wonton chocolate is composed of cocoa mass, xylitol, skim milk powder, Se-enriched spirulina platensis, high-gluten flour, stuffing, potato starch, glycyrrhizin, glycine, citric acid, phospholipids and salt. According to the wonton chocolate, the chocolate of an outer layer is neither too hard nor too soft, is smooth in mouthfeel, and does not stick to teeth; the xylitol and the glycyrrhizin are used for replacing white granulated sugar, calories are low, blood fat and blood glucose can be reduced, waste in the intestinal tract is cleared away, and immunity is improved; as the glycyrrhizin, the glycine and the salt are used in a compounded mode, bitterness of the chocolate is covered, and the chocolate is fragrant and sweet in flavor; with the Se-enriched spirulina platensis, the wonton chocolate is richer in nutrition, can improve immunity, and has anti-tumor and anti-aging effects; wonton of an inner layer is crisp in mouthfeel, and the stuffing is rich in nutrition and easy to assimilate; the wonton chocolate is rich in whole content, and is well arranged, and the mouthfeel is mellow, fragrant, sweet and soft; the aged and children can eat the wonton chocolate normally.

The invention discloses a photinia disinsectization device for a municipal garden. The photinia disinsectization device comprises a box body, wherein a partition plate is arranged on the top internalwall of the box body, a through hole is formed in the external wall of one side of the box body, a bracket is arranged on the bottom internal wall of the box body, a lamp holder is arranged on the topexternal wall of the bracket, a light trap is in threaded connection with the bottom internal wall of the lamp holder, a trapping hopper is in socket joint with the external wall of one side of the partition plate, an insect removing box is arranged on the external wall of one side of the trapping hopper, an insect removing plate is arranged on the external wall of one side of the partition plate, first baffles which are of scattered distribution are separately arranged on the insect removing plate and the external wall of one side of the partition plate, a connecting net is arranged on the external wall of one side of the partition plate, the cross section of the connecting net is W-shaped, a motor is arranged on the external wall of one side of the box body, and a first rotating shaft is fixedly connected with the external wall of one end of an output shaft of the motor. According to the photinia disinsectization device for the municipal garden, mosquitoes and beneficial insects canbe effectively separated, and the influence on pollination work of photinia due to the fact that the beneficial insects are killed by subsequent devices is avoided.

The invention relates to a medicine composition for treating fowl enteritis. The medicine composition comprises the following components by weight part: 6-18 parts of myrobalan, 6-18 parts of radix sophorae flavescentis, 5-15 parts of oxalis, 5-15 parts of acalypha australis, 3-9 parts of hawthorn, 3-9 parts of poria cocos, 3-9 parts of pericarpium citri reticulatae, 3-9 parts of poplar flower, 3-9 parts of pericarpium granati, 3-9 parts of astragalus membranaceus, 3-9 parts of codonopsis pilosula and 3-9 parts of liquorice. The traditional Chinese medicine composition has an excellent curative effect, is free from drug residue, has no drug resistance and has no effect on normal growth and development of fowl.

The invention relates to the technical field of biological prevention and control, and particularly discloses application of petunia hybrida to trapping and killing thrips. According to the application, the petunia hybrida and target plants to be protected are planted in a matched manner, the petunia hybrida is used for trapping and killing the thrips, and therefore the thrips are prevented and treated in a biological manner. A biological prevention and control method for the thrips specifically comprises the following steps of cultivating petunia hybrida plants for trapping and killing the thrips; planting the target plants to be protected; and planting the petunia hybrida plants and the target plants to be protected in the matched manner. According to the application, under the conditionthat pesticide treatment is not needed, the thrips can be remarkably controlled only through a biological control means, and good social benefits and ecological benefits are achieved. The method hasthe advantages of environmental friendliness, economical performance, high efficiency, simplicity and convenience in operation, easiness in popularization and the like.

The invention relates to the technical field of insect transportation, and particularly discloses a method for long-distance transportation of fruit fly wormy fruit samples. Melons and fruits with attached melon fly larvae are packed in a package bag with vermiculite, a bag mouth is fastened, and then the packaging bag is put into a breathable packaging box for transportation. According to the method, the melons and fruits provide food for the melon fly larvae, so that the melon fly larvae maintain normal physiological activities. The melon fly larvae eat the melons and fruits, the melons andfruits rot, a large amount of sewage flows out, the larvae are prone to being drown, and a larval environment is affected. The vermiculite has the characteristics of light weight, good breathability,strong water absorption and the like. The vermiculite can absorb the sewage produced by pumpkin decay and maintain a dry and breathable environment. The vermiculite further has the effect of bufferingextrusion and reducing vibration. The survival rate of melon flies can be significantly improved by adding the vermiculite.

The invention provides a wheat grain lead control agent as well as a preparation method and application method thereof. The wheat grain lead control agent is prepared from an agent A, an agent B and an agent C. The agent A is prepared from 6-7% of calcium phosphate, 3-4% of Fe3O4@C-COOH, 0.1-0.3% of nano manganese sulfate, 0.1-0.3% of nano zinc sulfate, 0.1-0.3% of nano magnesium sulfate and the balance of urea. The agent B is prepared from the following raw materials of: 0.5-1.5% of nano magnesium sulfate, 2-4% of humic acid, 0.5-1% of Fe3O4@C-COOH, 0.5-1.5% of alkyl naphthalene sulfonate and the balance of water. The agent C is prepared from the following raw materials of: 0.2-0.4% of nano manganese sulfate, 0.2-0.4% of nano zinc sulfate, 2-4% of humic acid, 0.1-0.3% of Fe3O4@C-COOH, 0.5-1.5% of alkyl naphthalene sulfonate and the balance of water. The invention also provides an application method of the lead control agent. The method comprises the following steps that: S1: after wheat turns green, the agent A is applied into wheat soil; S2, after the wheat sprouts out stems, the agent B is sprayed to wheat leaves; and S3, after the wheat is under grain filling, the agent C is sprayed onto the wheat leaves. The lead control agent and the application method provided by the invention can be used for atmosphere-soil two-end synergistic lead control on the wheat, and are harmless to the environment and human bodies.

The invention discloses a greenwood cutting propagation method for kosteletzkya virginica. According to the technical scheme, the method includes the steps that 1, 10-20 cm semi-lignified stem segments on the upper parts of stems or first-grade branches are cut to serve as cutting slips; 2, 2-3 leaves are retained on the upper part of each cutting slip; 3, the bases of the cutting slips are immersed in a 20% isolane mixture 20-200 ppm solution by 3-5 cm for 3-15 days; 4, a cutting medium and containers are sterilized with a disinfectant one day before cutting; 5, one rooted cutting slip is inserted in the medium of each container; 6, the stacked containers are covered with a sunshade net; 7, the medium is kept moist and is watered thoroughly at a time in the watering process; 8, quick-acting fertilizer is applied once every 7-10 days; 9, acclimatization and transplant are carried out. The method has the advantages of simple operation, low cost and good stability, does not influence normal growth and development of parents, avoids waste caused by transplant of cutting slips without the rooting capacity, ensures high rooting quality, and has good economic, ecological and social benefits.

The invention relates to the field of environmental governance methods, and particularly discloses a method for efficiently preventing and controlling cadmium pollution in a wheat-corn rotation system. The method mainly comprises the following steps: applying a fertilizer A which is composed of urea, calcium phosphate, Fe3O4@C-NH2, manganese sulfate, zinc sulfate and magnesium sulfate after wheat reviving, applying the fertilizer A in a corn seedling stage after wheat harvesting, spraying a fertilizer B which is prepared from nano magnesium sulfate, humic acid, Fe3O4@C-NH2, alkyl naphthalene sulfonate and water onto leaf surfaces of the wheat and the corn in a wheat and corn elongation stage, and spraying a fertilizer C which is prepared from nano manganese sulfate, nano zinc sulfate, humic acid, Fe3O4@C-NH2, alkyl naphthalene sulfonate and water onto ears of the wheat and the corn after the grain filling stage of the wheat and the grain flowering stage of the corn. According to the method, roots are controlled and prevented from absorbing cadmium in soil in the seedling stage, leaves are controlled and prevented from absorbing cadmium in atmospheric dust fall in the elongation stage, the ears are controlled and prevented from absorbing cadmium in atmospheric dust fall in the grain filling stage of the wheat and the grain flowering stage of the corn, and the purposes of relay prevention and control in the growth stage, crop rotation system prevention and control and prevention and control cost reduction are achieved.

The invention belongs to the technical field of environmental pollution treatment, and particularly relates to an ear retarder for reducing lead in wheat grains and a preparation and application method thereof. The ear retarder is prepared from the following raw materials in percentage by mass: 0.2 to 0.4 percent of manganese sulfate, 0.2 to 0.4 percent of magnesium sulfate, 0.2 to 0.4 percent of zinc sulfate, 3 percent of humic acid, 0.2 percent of Fe3O4@C-COOH, 1 percent of alkyl naphthalene sulfonate, 0.2 percent of cyhalothrin and the balance of water. The preparation method comprises the following steps: S1, respectively weighing the following raw materials in percentage by mass: 0.2 to 0.4 percent of manganese sulfate, 0.2 to 0.4 percent of magnesium sulfate, 0.2 to 0.4 percent of zinc sulfate, 3 percent of humic acid, 0.2 percent of Fe3O4-coated C-COOH, 1 percent of alkyl naphthalene sulfonate, 0.2 percent of cyhalothrin and the balance of water; and S2, uniformly mixing the raw materials in the S1 to obtain the ear retarder. The ear retarder provided by the invention can achieve the effect of reducing the content of Pb in wheat grains by inhibiting the absorption of Pb in atmospheric dust fall by wheat ears; and according to the ear retarder provided by the invention, all the components are harmless to a human body, the application mode is simple, and the beneficial effects are obvious.