76results about How to "Increase carbon dioxide levels" patented technology

The present invention relates to a composition comprising a cyclopropene, for example 1-MCP, encapsulated in a cyclodextrin matrix, a hygroscopic compound, yeast and / or other enzymes involved in the production of alcohols and aldehydes from organic substrates, and, optionally an organic substrate for the enzymes. The composition of the present invention provides, under controlled conditions, the co-release of the cyclopropene, alcohols, aldehydes and carbon dioxide, which work together to improve the quality of plants during storage. Methods and commercial packages employing these compositions are also disclosed.

Aqueous compositions formed from combining water, and at least one solute such as sodium bicarbonate, acetylsalicylic acid or mixtures thereof, are used to introduce and maintain relatively high levels of carbon dioxide in the atmosphere of selected environments. The aqueous compositions benefit live plants and prolong the shelf life of various perishable foods and products, including vegetables, fruits, meats, fish, seafood, dairy products, and dry goods and ingredients. The aqueous compositions are applied directly by bathing or showering a perishable product in the aqueous compositions, or indirectly with absorption devices that carry the aqueous compositions, and which are placed in close proximity to a perishable product. An aqueous composition can be applied to or formed directly on an absorption device. An absorption device can also be recharged by reapplying or reforming the aqueous composition to the absorption device as needed.

The present invention relates to an exhaust apparatus for releasable or permanent connection to a personal protection respiratory device that defines a filtered air volume adjacent to the face of a wearer and comprises at least one exhalation valve. The exhaust apparatus comprising a powered blower in fluid connection with the at least one exhalation valve, the blower being operable to draw a portion of the wearer's exhaled breath through the at least one exhalation valve. Using such an exhaust apparatus for releasable connection to a personal protection respiratory device improves the comfort and overall experience for respirator wearers who use the respirator for intensive work, and / or for long periods of time, and / or in hot and humid environmental conditions by removing the heat and moisture build-up inside the respirator.

The present invention relates to an exhaust apparatus for releasable or permanent connection to a personal protection respiratory device that defines a filtered air volume adjacent to the face of a wearer and comprises at least one exhalation valve. The exhaust apparatus comprising a powered blower in fluid connection with the at least one exhalation valve, the blower being operable to draw a portion of the wearer's exhaled breath through the at least one exhalation valve. Using such an exhaust apparatus for releasable connection to a personal protection respiratory device improves the comfort and overall experience for respirator wearers who use the respirator for intensive work, and / or for long periods of time, and / or in hot and humid environmental conditions by removing the heat and moisture build-up inside the respirator.

The invention relates to the technical field of grape production, in particular to novel technology for twice production of grapes in one year. The technology comprises production period normal management, normal technological management of a sunny greenhouse, normal technological management of a sunny greenhouse, nutritive water management and comprehensive control of diseases and insects, fruiting of winter buds of annual-growth grape plants, twice planting of annual-growth grape plants in one year and twice production of fresh grapes in one year. The production steps comprise: selecting a good-quality grape variety, planting annual-growth grape seedlings in a soil accommodating container, placing the container in a corrugation, performing the production period normal management, trimming before protection against cold, disc-fixing grape braches, covering the grape braches by sand, taking the container out, transferring the container to a temperature regulation room, controlling the temperature and the moisture of the temperature regulation room, performing the before-planting temperature rise twice in one year, taking out the container, placing the container in the corrugation, performing the normal management, and simultaneously placing an ozone generator to control the growth of braches, leaves, flowers and fruits. By adopting new technology, the grape yield is improved by three times, the utilization rate of land is doubled, the profit is raised by three times and the labor efficiency is improved.

Carbon dioxide is used to control the ratio of polymer components in a polyethylene composition made using a combination catalyst comprising a chromium catalyst, a single site catalyst and one or more activators.

The invention discloses a water-soluble fertilizer and particularly discloses a carbon-containing water-soluble fertilizer. The fertilizer is prepared from the following ingredients in parts by weight: 60-85 parts of water-soluble carbon fertilizer, 10-25 parts of water-soluble phosphate fertilizer, 0-20 parts of water-soluble potash fertilizer and 1-3 parts of water-soluble trace element fertilizer, wherein the water-soluble trace element fertilizer contains organic complex trace elements, of which the content is not lower than 20%. The carbon-containing water-soluble fertilizer prepared by a method disclosed by the invention can be used for supplementing nutrients to crops, enhancing a fertilizer effect and promoting growth, and can be used for supplying carbon dioxide, so that the photosynthesis efficiency of the crops is increased, the yield is increased, and the quality is improved; particularly, the proportioning ratio of nutrients can be flexibly adjusted conveniently according to the actual needs of land and the growth of the crops, so that the use is greatly facilitated.

Packaging using Gas Permeable Non-Woven Fabric based Film extends the shelf life of various fresh fruits and vegetables and vase life of fresh cut flowers by changing the atmosphere in which these living products are stored and respires. The high oxygen and carbon dioxide permeability of the Gas Permeable Non-Woven Fabric based Film establishes an ideal atmosphere for the specific perishable item, and therefore extends its shelf life. The establishment of lower oxygen and carbon dioxide atmospheres inside packages using Gas Permeable Non-Woven Fabric based film, also leads to reduction in the respiration rate of the perishable items. The reduction in the respiration rate prevents loss of moisture, production of metabolic heat, and yellowing, browning, reduction in production levels of ethylene. Thus the created atmosphere is able to extend shelf life, maintain high quality and preserve nutrients of fresh produce items by naturally regulating respiration of said produce / flower.

The invention discloses a gas-containing coal permeation-increasing method adopting joint action of carbon dioxide detonation and acidification. According to working face parameters, the coal seam thickness, the gas content and the like, the drilling hole arranging mode of a permeation-increasing unit is comprehensively confirmed, and a plurality of permeation-increasing units are arranged on a working face; and drilling holes in the permeation-increasing unit are adopted with the following measures that firstly, carbon dioxide detonation is conducted through a detonation hole, then acid liquid is injected through an acidification hole, the setting time is maintained, and finally, the detonation hole and the acidification hole are connected into an extraction system to conduct gas extraction. According to the permeation-increasing method of the coals containing the gas through the joint action of detonation and acidification of the carbon dioxide, while coal seam breathability is increased, the content of the carbon dioxide is greatly improved through early carbon dioxide detonation and later-period acidification, and additionally, the adsorption capacity of the coals on the carbon dioxide is further larger than that of methane, so that the replacement and displacement effects on the methane are achieved. According to the gas-containing coal permeation-increasing method adopting the joint action of carbon dioxide detonation and acidification, through sufficient combination of the advantages of carbon dioxide detonation and acidification, coal seam breathability is greatly improved, and the gas extraction rate is improved.

The invention discloses an air purification method and system adopting fresh air and belongs to the indoor environment purification technology. The air purification system is characterized by comprising a casing, an air quantity regulation part and at least one primary filter screen layer, wherein an air inlet and an air outlet are formed in the casing, and the air inlet is used for introducing outdoor air; a first air treatment assembly and a second air treatment assembly are arranged in the casing, the first air treatment assembly comprises a power fan, the second air treatment assembly comprises a reusable dust collecting device, and the purification performance of the dust collecting device does not get poor after cleaning; the air quantity regulation part is used for controlling the rotating speed of the power fan, so that the speed range of air output from the air outlet ranges from 0.3 m / s to 5 m / s, and the primary purification efficiency of the dust collecting device for PM 2.5 is enabled to be as high as 80%-99.9%.

The invention discloses a system for preparing biomass gasified gas by using flue gas of an oxygen-enriched combustion boiler. The system is characterized by comprising a circulating fluidized-bed gasifier and a cyclone separator, wherein the circulating fluidized-bed gasifier is provided with a charging opening which is used for inputting a biomass material to the circulating fluidized-bed gasifier; the circulating fluidized-bed gasifier is further provided with a gas inlet which is used for inputting the flue gas of the oxygen-enriched combustion boiler; the circulating fluidized-bed gasifier is used for gasifying the biomass material under the action of the flue gas of the oxygen-enriched combustion boiler, so as to obtain the gasified gas; the cyclone separator is connected with the circulating fluidized-bed gasifier and is used for separating the gasified gas. A biomass gasification system and an oxygen-enriched combustion boiler system are used in a matched manner, and the flue gas of the oxygen-enriched combustion boiler is adopted as a gasifying agent for biomass gasification reaction, so that the energy utilization efficiency of the oxygen-enriched combustion boiler system is increased, the quality of the biomass gasified gas is improved, the whole heat energy utilization efficiency is increased, and the production cost is reduced.

The invention discloses a seedling growing method for Dendrobium huoshanense. The method comprises the following steps: (1) processing seeds: sterilizing Dendrobium huoshanense seeds, mixing the sterilized seeds with a nutrient matrix, and burying the obtained mixture in a sand pool for 2-3 months; (2) accelerating germination of the seeds: activating the seeds, and using a fermentation solution to carry out constant temperature immersion in order to accelerate the germination; (3) sowing the seeds in a greenhouse: laying a nutrient matrix layer, a plant fertilizer layer and loess to form soilin the planting area of the greenhouse, and sterilizing the soil by the fermentation solution; and (4) regulating the greenhouse: regulating the illumination intensity and the carbon dioxide concentration within and after one month after the sowing. Compared with the traditional methods, the method improves the germination rate by 28.83%, improves the polysaccharide content by 6.66% and improvesthe co of the total alkaloid content by 0.025%; and Dendrobium huoshanense cultivated through has the characteristics of fast growth and strong drug functions.

A gas separation process for treating exhaust gases from multiple combustion sources. The invention involves directing an exhaust gas stream from one combustion step to a carbon capture step. An off-gas stream depleted in carbon dioxide from the carbon capture step is mixed with a second exhaust stream from a second combustion step to form a mixed gas stream. The mixed gas stream is passed as a feed stream across the feed side of a membrane that is selectively permeable to carbon dioxide over nitrogen and carbon dioxide over oxygen. A sweep gas stream, usually air, flows across the permeate side, and picks up the preferentially permeating carbon dioxide. The permeate stream withdrawn from the permeate side of the membrane is then recycled back to the combustor.

The invention provides a passion fruit fresh-keeping agent, as well as a making method and application thereof, and belongs to the field of food processing. The passion fruit fresh-keeping agent is made through the following steps of firstly cutting passion fruit shells into passion fruit shell segments, cutting grapefruit peel into grapefruit peel segments, cutting orange peel into orange peel segments, adding activity fluid, and performing treatment in a superhigh-pressure homogenizing machine to obtain substances a; then crushing perilla leaves, konjak and corn stigma, soaking the crushed perilla leaves, the crushed konjak and the crushed corn stigma, and performing extraction by a subcritical extraction method to obtain substances b; and mixing the substances a with the substances b, and substances c extracted from buckwheat flowers, honeysuckle flowers, common andrographis herbs, heartleaf houttuynia herbs, radix scutellariae, folium isatidis and herba artemisiae scopariae, to obtain a mixture, putting the mixture into a high-pressure micro jet nanometer dispersion machine, and performing dispersion to obtain the fresh-keeping agent. The invention further provides a use method of the fresh-keeping agent. The obtained passion fruit fresh-keeping agent is safe and non-toxic, can prevent passion fruits from producing phenomena of weight losses, shrinkage and the like, can maintain the quality of the appearance and the pulp of the passion fruits, and can prolong the storage life of the passion fruits.

The invention provides a solid waste incinerator body. The incinerator body and a hearth of an incinerator are of vertical structures. The hearth is sequentially provided with a drying zone, a pyrolyzing zone and a burning zone from top to bottom, a group of fiery pits are arranged on the inner side of the hearth, a group of spray guns are respectively arranged on the outer side, the left side and the right side of the burning zone, a blocky compressed solid waste inlet is arranged on the outer side of the upper portion of the hearth, a boiler furnace and a draught fan are arranged at the top of the hearth, a group of spray guns are arranged on the side wall of the boiler furnace, the draught fan enables smoke to be discharged out of the incinerator, oxygen enriched gas formed by mixing residual smoke and pure oxygen is led to the third group of spray guns of the burning zone and the group of spray guns of the boiler furnace. The incinerator hearth is small in volume and large in solid waste disposal capacity, and the solid waste incinerator body is rapid in burning speed, good in effect, capable of disposing solid waste of various kinds at the same time, energy-saving, environment-friendly and remarkable in effect.

The present invention relates to a method of increasing the carbon dioxide level in a patient in by administering to the patient an inhalant that comprises a mixture of carbon dioxide and atmospheric air. The method can be used to treat a patient suffering from asthma, allergies, muscle tension, pain, insomnia, and / or mental stress. The present invention also relates to a device that may be used in a method of an inhalant that comprises a mixture of carbon dioxide and atmospheric air to a patient.

The invention discloses a household automatic air purification system. The household automatic air purification system comprises an air purifier arranged outdoors, an air feeding pipeline and an air return pipeline. The air purifier is provided with a fresh air inlet used for sucking external atmosphere, an indoor air inlet used for sucking indoor air and an exhausting port used for exhausting purified clean air to the outside. The air feeding pipeline connects the air exhausting port of the air purifier with indoor space to feed the clean air exhausted by the air exhausting port of the air purifier into a room; the air return pipeline connects the indoor air inlet of the air purifier with the indoor space to feed the indoor air into the air purifier for purification. The use defect in the market that the purification effect can be improved only by closing doors and windows is overcome, the situation that the content of carbon oxide is increased and the content of oxygen is decreased indoors is prevented, the limitation that air can be purified only through a central air conditioning system is broken through, the purification area is increased, and loss of indoor useful space is reduced.

The invention discloses cultivating equipment to which a nutritive solution can be continuously supplied. The cultivating equipment comprises cultivating tanks which are used for placing a cultivatingpot, the upper ends and the lower ends of the cultivating tanks deliver the nutritive solution circulatingly with a liquid tank through liquid inlet pipes and liquid outlet pipes respectively, a water pump and an electromagnetic valve are arranged on the water inlet pipe above the liquid tank, electromagnetic values are arranged on both the liquid inlet pipes and the liquid outlet pipes of the upper ends and the lower ends of the cultivating tanks, and are both connected with an industrial personal computer through a connecting wire, the outer part of the industrial personal computer is connected with a solar panel, there are at least two cultivating tanks in the soilless cultivating equipment, and the cultivating tanks are in parallel connection through a connecting pipe. By means of thecultivating equipment to which the nutritive solution can be continuously supplied, it can be achieved that the nutritive solution is continuously supplied, less energy is consumed, less nutritive liquid is evaporated, the automated degree is high, and the photosynthesis effect of soilless culture crops is improved.

The invention discloses a natural long-acting fruit-vegetable preservative and a preparation method thereof, and relates to the technical field of preservatives. The biological preservative is prepared from the following raw materials in parts by weight: 4-8 parts of allium chinensis, 4-10 parts of tea leaves, 2-6 parts of baikal skullcap roots, 2-6 parts of mulberry fruits, 8-14 parts of celery leaves, 2-6 parts of galanga resurrectionlily rhizomes, 6-12 parts of shaddock peel, 4-10 parts of cornus officinalis, 2-8 parts of turmeric, 2-8 parts of bamboo leaf extract, 2-8 parts of lotus leaf extract, 6-14 parts of konjac glucomannan, 3-6 parts of ethanol, 0.5-2 parts of calcium chloride, 0.5-2.5 parts of glycerol monolaurate, and 60-120 parts of distilled water. The preservative provided by the invention can effectively inhibit the growth of bacteria, and prevent the rot of fruits and vegetables, and has an anti-oxidation effect besides a fresh-keeping effect. The preservative of the invention is prepared from natural plant components, is non-toxic and harmless, is safe to use, and can be removed just by cleaning with clear water.

The invention relates to popping candy producing equipment which comprises a sugar boiling device, a stirring pot and a cooling device, arranged in sequence, as well as a carbon dioxide feeding device connected with the stirring pot, wherein the sugar boiling device is divided into a sugar melting part and a sugar boiling part, and independent temperature control is carried out on the two parts to improve the syrup quality; the stirring pot adopts a heat preservation structure to prevent the melting syrup in the stirring pot body from coagulating and solidifying, more carbon dioxide is enabled to be mixed in the melting syrup, and the taste of the popping candy is enabled to be better; the cooling device adopts a strip-shaped pipe body as a puffing cavity to supply carbon dioxide during the puffing process, the puffing is enabled to be more thorough, the carbon dioxide content in the popping candy finished product is enabled to be higher, and the taste is better; through the arrangement of a carbon dioxide heating device, the carbon dioxide feeding device avoids the part solidification of syrup, and prevents the carbon dioxide from continuously blending, thereby enabling the popping candy finished product to be higher in carbon dioxide content, more uniform in distribution and better in taste, and further improving the quality of the popping candy.

The invention discloses a controllable heat-dissipation thermal-insulation oblique arched seedling raising greenhouse. The seedling raising greenhouse comprises a greenhouse frame and an outer protective enclosure, the outer periphery of the greenhouse frame is provided with the outer protective enclosure, the outer side of the outer protective enclosure is provided with an external thermal insulation system, and a water supply system and a power distribution system are arranged in the greenhouse frame; a parabolically oblique arched support is adopted at the upper part of the greenhouse frame, and the upper part of the greenhouse frame is provided with a side skylight system installed at the side edge of the parabolically oblique arched support; an outer sun-shading system is arranged atthe upper part of the greenhouse frame; and switching of thermal insulation and ventilation is performed by the external thermal insulation system and the side skylight system by adopting an electricfilm rolling form. According to the invention, the seedling raising greenhouse is stable and firm in structure, large in space span and easy to operate, the lighting performance is good, the ventilation performance is good, the thermal insulation performance is high, the seedling raising environment microclimate is conveniently controlled, the seedling growth is effectively accelerated, the seedling quality is improved, the seedling raising period is shortened, the worker labor efficiency is improved, and the problems that a seedling raising greenhouse is hot and humid in the summer and the temperature is too low in the winter are effectively solved.

A method and apparatus for the regeneration, acclimation and conditioning of in vitro derived plant propagules is presented. The apparatus comprises a regulated chamber, a laminar flow work station coupled to the regulated environment, and a supply compartment. A process control system regulates the chamber to sterile or near sterile conditions. The process control system monitors and modulates the microenvironment, nutritional profile and frequency of fertigation, atmospheric composition, as well as the quality and quantity of irradiance incident on propagules in the sterile chamber. This controlled environ optimizes propagules regeneration, and facilitates the establishment of photoautotrophism and homeostatic capacity of plant tissues. Furthermore, the apparatus allows for the metabolic and morphologic conditioning of plantlets for high intensity indoor cultivation as well as the inoculation of plantlets with beneficial bacteria and fungi which increase metabolic function and provide a protection from colonization of plantlets by pathogenic microflora through spatial occupation.

The invention discloses a method for producing astaxanthin by inducing Haematococcus pluvialis, which is characterized by comprising the following steps: in the vegetative growth phase, inoculating Haematococcus pluvialis in a nutrient culture medium, and culturing; continuously keeping irradiation on the Haematococcus pluvialis and ensuring that the intensity of illumination arriving at the Haematococcus pluvialis cell surface is 20-200 mu mol.m<-2>.s<-1>; in the induction stage, adding ethanol and seawater crystal into the production culture medium, wherein the ethanol added into the production culture medium accounts for 0.5-3 vol%, and the seawater crystal added into the production culture medium accounts for 0.5-1 wt%; and continuously introducing filtered air mixed with 1-3 vol% carbon dioxide into the production culture medium, wherein 0.2-0.4L / minute of the air is introduced to every 1L of production culture medium. The method can induce the Haematococcus pluvialis to quickly accumulate the astaxanthin, is simple and has the advantages of high yield and favorable effect.

The invention discloses special organic fertilizer for tea and a preparation method of the special organic fertilizer, and relates to the technical field of fertilizer for tea trees. The special organic fertilizer is prepared from components in percentage by weight as follows: 10%-15% of diammonium phosphate, 25%-30% of urea, 10%-15% of potassium sulfate, 20%-25% of humic acid and 25%-30% of amino acid, wherein diammonium phosphate supplies phosphorus and nitrogen simultaneously, urea supplies nitrogen, humic acid in the organic fertilizer can produce organic colloid, the adsorption capacity of a soil colloid structure is improved, soil structure improvement is promoted, the water and fertilizer retention performance of the soil is improved, comprehensive nutrient elements are provided, the absorption capacity of the tea trees is enhanced effectively, water-soluble phosphorus is prevented from being contacted with large amount of active iron in a tea garden, phosphorus uptake is promoted, and the problem of phosphorus deficiency of the tea trees is solved effectively; by means of addition of the amino acid, nitrogen can be supplied under the condition that urea runs off completely due to volatilization, and drastic fluctuation of nitrogen uptake is avoided.

The invention provides an all-weather, intelligent and three-dimensional planting and cultivation agricultural facility system. The system comprises a closed building, and further comprises a liquid supply device for supplying water or nutrient solution; the closed building comprises a foamed glass-ceramic wall, the interior of the closed building is of a multilayer structure which comprises a cultivation pond, a planting rack, an artificial sunlight emitting device, and the cultivation pond is located right below the planting rack; the first planting layer close to the cultivation pond can belowered to be immersed into the cultivation pond; a spraying pipe is arranged above the planting rack; insect-preventing air exchanging devices and carbon dioxide conveying devices are arranged at the top and on the lateral side of the wall, and the air exchanging between air inside the wall and external air is achieved through the insect-preventing air exchanging devices to provide sufficient carbon dioxide to promote crop photosynthesis. The system has the advantages that space utilization rate in the system is increased, and economic benefits are increased; by the foamed glass ceramic andthe artificial sunlight emitting device, plant photosynthesis time can be prolonged, carbon dioxide content can be increased, photosynthesis efficiency can be increased by folds, and the total quantity of synthesized organic matter can be increased.

The invention discloses a gas freshness preservation transportation box for fresh food delivery. The transportation box comprises a box body and a sealed storage space, a heat insulation interlayer isarranged on the inner side of the box body, the sealed storage space is arranged on the inner side of the heat insulation interlayer, the top of the sealed storage space is provided with a top heat conduction plate, the upper side and the lower side of the top heat conduction plate are provided with heat conduction fins, and one side of the sealed storage space is provided with a taking and placing opening. Fresh food is stored by the sealed storage space, a top refrigerating bin can store dry ice so as to cool the fresh food, the top refrigerating bin is spaced from the sealed storage spacethrough the top heat conduction plate, therefore, the temperature of sealed storage space can be reduced, and the freshness preservation time of the fresh food can be prolonged; and meanwhile, the toprefrigerating bin communicates with the sealed storage space through a connecting pipe, carbon dioxide gas produced by the dry ice can enter the sealed storage space through the connecting pipe, therefore, the carbon dioxide content in the sealed storage space is improved, oxidation of vegetables and fruits is restrained, and the freshness preservation effect of the fresh food is further improved.

The invention discloses a soda water beverage dispenser provided with a pressure maintaining structure. The soda water beverage dispenser comprises a body, wherein a gas outlet pipe for providing carbon dioxide is arranged on the body, one end of the gas outlet pipe is connected with a carbon dioxide gas tank, and the other end of the gas outlet pipe is inserted into a tank; the soda water beverage dispenser further comprises a pressure relief gas pipe communicated with the tank and the outside; one side of the tank is communicated with a chamber through a connecting pipe, and a piston is arranged in the chamber and propped against a spring; a second piston is glidingly arranged at the bottom of the tank; a jacking mechanism used for pushing the second piston and a cooling chamber used for cooling the tank are arranged on a base; the tank is arranged in the cooling chamber, a plurality of separation boards are arranged in the tank at intervals, through holes allowing water to flow through are formed in the separation boards, and the through hole of one of two adjacent separation boards is far away from the through hole of the other of two adjacent separation boards. According to the soda water beverage dispenser, the higher carbon dioxide content of soda water is guaranteed, and the taste of soda water is guaranteed.

The invention relates to a brewing method of sparkling semi-sweet yellow rice wine, and belongs to the technical field of yellow rice wine brewing. The brewing method of sparkling semi-sweet yellow rice wine comprises the following steps: (1) weighing materials: weighing aged demi-sec yellow rice wine (aged rice-adding wine), sweet yellow rice wine (Xiangxue wine), isomaltooligosacharide, chitosanoligosaccharide, tea saponin, high-activity dry distiller's yeast and water; (2) feeding: putting the aged demi-sec yellow rice wine (aged rice-adding wine), sweet yellow rice wine (Xiangxuewine), isomaltooligosacharide, chitosan oligosaccharide, tea saponin, high-activity dry distiller's yeast and water into a pressure-resistant bottle; (3) fermenting; (4) detecting the pressure; (5) sterilizing; and (6) cooling. The isomaltooligosacharide, chitosan oligosaccharide and tea saponin are added into the finished yellow rice wine, secondary fermentation is performed, ratio-controlled, low-temperature and short-time in-bottle fermentation is performed to make the wine contain enough carbon dioxide, and no precipitate is generated in the bottle after sterilization; and the mouth killing property, the tasty and refreshing property, the harmony of the wine body and the durability of foam of the wine taste are improved.

The invention discloses a natural biological fresh-keeping agent and a preparation method thereof, and relates to the technical field of fresh-keeping agents. The biological fresh-keeping agent is prepared from, by weight, 2-8 parts of Chinese bulbous onion, 4-10 parts of tea leaves, 5-9 parts of eutrema yunnanense, 3-7 parts of trichosanthes kirilowii maxim, 2-8 parts of rhizoma atractylodis macrocephalae, 4-10 parts of radix angelicae, 2-8 parts of gallnut, 0.5-3.5 parts of rosemary essential oil, 6-12 parts of wheat bran, 1-4 parts of glycerinum, 0.5-2.5 parts of tartaric acid, 10-20 partsof pullulan polysaccharide, 0.5-2.5 parts of Arabic gum, 0.2-2 parts of edible salt, 0.5-2.5 parts of calcium chloride, 0.5-3 parts of coconut oil glyceride and 60-100 parts of distilled water. Various components excellent in bacterium restraining and sterilizing effect are combined, antioxidants, film forming agents and the like are added for achieving a mutual synergistic effect, the effect of the fresh-keeping agent is improved, and the fresh-keeping time of the fresh-keeping agent for fruits and vegetables is prolonged. The fresh-keeping agent is prepared by adopting natural plant components according to a proportion and is free of toxicity and harm.

The invention relates to the technical field of white tea planting, in particular to a planting management method for improving the selenium content of white tea. The planting management method includes an arable land selenium increasing method and a water fertilizer selenium increasing method and / or gas selenium increasing method. According to the method, pH (potential of hydrogen) of planting soil is adjusted to range from 7.1 to 7.5 before the white tea is planted, selenium elements in the soil is greatly absorbed by white tea trees in weakly alkaline environments, the content of selenium elements in the tea is effectively improved, barium chloride is added into fertilizers, so that sulfate in the soil rapidly precipitate under the combined action of barium ions, storage amount of sulfate radicals in the soil or the tea trees is decreased, so that the selenium elements are absorbed by the tea trees, the content of carbon dioxide in tea garden air is increased in continuous several days of five days after selenium-rich farm manure is applied once, so that photosynthesis of the tea trees is improved, and selenate and selenite of the farm manure are efficiently absorbed by the teatrees.