157 results about "Calcium content" patented technology

The invention discloses high-performance modified calcium carbonate and application thereof in a breathable film. The modified calcium carbonate is prepared by combining a three-element composite modification system composed of stearic acid, titanate and a silane coupling agent with a disc-nest mill three-stage gradient grinding process and antibacterial-hydrophobic dual-functionalization treatment of silver-loaded hydroxyapatite and a fluorinated modifier. The indexes of the prepared modified calcium carbonate are as follows: the median particle size (D50) is 1.8-2.2 mu m, the particle size (D97) of 97% particles is less than 6.5 mu m, the particles with the particle size of 1-5 mu m account for more than 60%, and the particles with the particle size of more than 10 mu m are less than 100 ppm; the content of calcium carbonate exceeds 97%, and the content of harmful impurities such as Fe is less than 200ppm; the whiteness is higher than 95; the oil absorption value is less than 12.5%, and the water content is less than 0.18%. When the composite material is applied to the breathable film in the medical field, the mechanical property, the antibacterial property and the hydrophobic property of the breathable film can be remarkably improved, the special requirements of the medical field on the breathable film are effectively met, and the composite material has good application prospects and industrial value.

The invention provides a method for improving the quality of whole wheat bread, and belongs to the field of food processing. Transglutaminase is used for catalyzing cross-linking of casein and mucedin, a protein compound obtained after reaction can form a gluten network in the dough, the gluten network structure of the whole-wheat bread dough is improved, by means of the method, the specific volume of whole-wheat bread is increased, the texture is softer, and the sensory quality is improved. Meanwhile, the content of protein and calcium in the bread is increased, and the nutritional value of the whole-wheat bread is improved.

The invention discloses a coal underground efficient gasification method based on calcium-based catalyst injection and a carbon dioxide geological storage method. The calcium-based powder material adopts high-purity limestone, wherein the content of calcium oxide is greater than 50%. The method comprises the following steps: crushing a limestone raw material into micron-scale to nano-scale powder, putting the powder into a stirring device, mixing the powder with a coal underground gasification injection agent to obtain a suspension fluid, and injecting the suspension fluid into a coal underground gasification furnace which is in production; calcite minerals in limestone are decomposed into calcium oxide under the coal underground gasification high-temperature effect, and the calcium oxide adsorbs water and carbon dioxide to the surface of coal coke to generate a synergistic gasification reaction at the same time. Wherein the injectant and the calcium-based powder suspension fluid are prepared by adopting a foam suspension device provided with an ultrasonic generator, so that the suspension stability of the calcium-based powder in the suspension fluid is improved. According to the invention, the calcium-based material is injected into the coal underground gasification furnace as the catalyst, so that the moisture, carbon dioxide and carbon in the coal are subjected to co-gasification reaction, the coal underground gasification reaction rate and gasification efficiency can be obviously improved, the environmental pollution is reduced, and the maximum utilization of resources is realized.

The present invention provides a dry chemical reagent sheet for detecting calcium content and a preparation method thereof, and relates to the field of dry chemical reagent sheets. The dry chemical reagent sheet includes a light-transmitting layer, a reagent layer and a diffusion layer, wherein the reagent layer is arranged above the light-transmitting layer, the diffusion layer is arranged above the reagent layer, the diffusion layer includes a diffusion layer reagent or is formed by a diffusion layer reagent, the diffusion layer reagent includes a hydrophilic polymer, a surfactant and particulate matter, wherein the particulate matter includes a first particulate matter and a second particulate matter; the number ratio of the first particulate matter to the second particulate matter is 1:(0.25-4), and the difference in particle size between the first particulate matter and the second particulate matter is 1-4 μm. The dry chemical reagent sheet provided by the present invention is easy to operate, can quickly and accurately quantitatively detect the calcium content in a liquid sample, has a simple preparation process, a small sample size, is easy to store and transport, has a low cost, and has a wide range of applications.

The invention provides a soak solution for apple storage and application of the soak solution in apple storage, and belongs to the technical field of fruit preservation. The soaking solution is an organic calcium solution; the concentration of the organic calcium solution is 20g / L-40g / L. The organic calcium is used as the soaking solution, so that the total calcium content in the apple peel can be increased, no peculiar smell is left on the fruit, and the fruit flavor is not influenced.

The invention aims to provide a morchella esculenta breeding method, an obtained morchella esculenta strain and application, the morchella esculenta is named as Morchella sextella NYD1, the taxonomic name of the morchella esculenta is Morchella sextella NYD1, the morchella esculenta is preserved in Guangdong Microbial Culture Collection Center, the preservation number of the morchella esculenta is GDMCC No: 66082, and the preservation date of the morchella esculenta is April 21, 2025. The morchella strain is further utilized as a mother strain to carry out domestication and cultivation, the morchella with the fruiting yield up to 400 kg / mu or above, excellent agronomic characters and rich nutritional ingredients such as crude protein, total sugar, iron, zinc and calcium is finally obtained, the content of the crude protein is not lower than 23 g / 100 g, the content of the total sugar is not lower than 55 g / 100 g, the content of the iron is not lower than 240 mg / kg, the content of the zinc is not lower than 70 mg / kg, and the content of the calcium is not lower than 76 mg / kg.

The invention provides modified milk powder capable of promoting bone health as well as a preparation method and application of the modified milk powder. The total protein content of the modified milk powder is 17-35 g / 100 g, the fat content of the modified milk powder is 1-32 g / 100 g, and the calcium content of the modified milk powder is 0.8-2.1 g / 100 g. Moreover, the modified milk powder contains bovine coloctrum and lactoferrin, the mass ratio of the bovine coloctrum to the lactoferrin is (5-100): 1 on the basis of the dry matter content, and the content of the lactoferrin in the modified milk powder is 2-400 mg / 100 g. The bovine colostrum and the lactoferrin are combined for preparing the milk powder, have a synergistic effect on promoting osteoblasts and inhibiting osteoclast proliferation, and are beneficial to bone health.

The invention discloses a method for accurately measuring trace calcium in high-purity magnesium metal by combining membrane desolvation and triple quadrupole mass spectrometry, which comprises the following steps: (1) sequentially adding water to wet a high-purity magnesium sample and adding acid to dissolve the sample to obtain a digestion solution, and adding an internal standard solution into the digestion solution; (2) preparing calcium element solutions with multiple concentration gradients, adding the internal standard solution, fixing the volume, and shaking uniformly; (3) sequentially carrying out atomization treatment and membrane desolvation treatment on the prepared solution to respectively obtain dry aerosol of the to-be-detected solution and the standard solution; and (4) carrying out scanning determination on the dry aerosol of the solution to be detected and the standard solution in the step (3) by using a triple quadrupole mass spectrometer, and calculating to obtain the calcium content in the high-purity magnesium sample. According to the method, the 24Mg16O polyatomic interference brought by the matrix element and the mass spectrum interference of the working gas Ar on the to-be-detected element 40Ca are removed through membrane desolvation and triple quadrupole mass spectrometry, so that the trace calcium element in the high-purity magnesium sample can be accurately determined, and the lower determination limit can reach ppb level.

The invention relates to a compound seaweed fertilizer and application thereof, and belongs to the technical field of agricultural chemicals. According to the invention, the pyridine ester compound and the seaweed fertilizer are compounded for use, and the pyridine ester compound and the seaweed fertilizer have a synergistic effect, so that the growth of cucumbers and the quality of fruits are remarkably improved. The compound seaweed fertilizer disclosed by the invention can be used for remarkably improving the yield, the length, the transverse diameter and the thickness of cucumbers and the contents of protein, total sugar, fat, vitamin B2, vitamin C, iron element and calcium element of the cucumbers.

The invention relates to the technical field of food, and provides a protein standardization method for preparing milk and a product thereof, and the method comprises the following steps: carrying out primary homogenization, pasteurization, protein index adjustment, secondary homogenization, protein maintenance and ultra-high temperature sterilization on impurity-removed raw milk in sequence; the protein index adjustment comprises the following steps: filtering the skimmed milk by adopting an ultrafiltration membrane system comprising two stages of ultrafiltration membranes which are connected in series to obtain ultrafiltration penetrating fluid with the protein content of 0 and the lactose content of 4.5-5.5 g / 100g; the ultrafiltration penetrating fluid is added into pasteurized pasteurized milk, so that the protein content in the obtained milk is 2.9-3.8 g / 100g; the ratio of the addition amount of the ultrafiltration penetrating fluid to the mass of the pasteurized milk is (1-20): 100. According to the method disclosed by the invention, the problems of unqualified physicochemical indexes, non-uniform taste, non-compliant calcium content and the like of the product are avoided while protein standardization is realized, and the stability of the system of the obtained milk product in the shelf life can be ensured.

The invention provides an effective calcium content rapid self-detection method based on a conductivity test, and relates to the technical field of road engineering detection. The rapid self-detection method for the effective calcium content comprises the following steps: preparing an ammonium chloride solution and a lime stabilizing material; putting the lime stabilizing material into a beaker, and adding water to prepare a mixed solution; assembling and calibrating a conductivity meter, and erecting an electrode and a burette; carrying out a titration experiment by using an ammonium chloride solution, and detecting the conductivity of the solution by using a conductivity meter; recording the corresponding relation between the ammonium chloride solution titer and conductivity, drawing a curve image, and searching the ammonium chloride solution titer at a reaction end point; and calculating the effective calcium content in the lime stabilizing material according to the reaction endpoint titration amount. The effective calcium content in the lime stabilizing material is accurately detected through the conductivity change rule, the experiment steps are simplified, a standard curve does not need to be drawn, the detection time is shortened, and the detection and construction efficiency is improved.

The invention belongs to the technical field of fruit tree cultivation and plant growth regulation, and particularly relates to a plant growth regulator containing 5-ALA and application of the plant growth regulator in prunus humilis planting. According to the method disclosed by the invention, the nutritional quality of fruits is remarkably improved by spraying a 100 mg / L 5-ALA solution on the whole cerasus humilis plant. Compared with clear water, the sugar content of the cerasus humilis fruits treated by the 5-ALA in the full ripening stage is increased by 44.01%, the acidity is reduced by 23.75%, the soluble solids are increased by 60.22%, and the flavor of the fruits is remarkably improved; meanwhile, the total calcium content of the fruits is increased by 30.22%, the water-soluble calcium content is increased by 91.12%, the pectin calcium content is reduced by 30.04%, and the active calcium content is increased by 50.74%; the content of soluble protein is increased by 30.98%, so that the acidity is reduced, and sugar, calcium and protein are synergistically improved.

The invention belongs to the technical field of food processing methods, and particularly relates to a preparation method of squid skin chelated calcium peptide powder. Squid skin is used as a raw material, small-molecular-weight squid skin peptide powder is obtained through enzymolysis, ultrafiltration and membrane separation, then the small-molecular-weight squid skin peptide powder, calcium chloride and ethyl alcohol are subjected to a chelation reaction and protein precipitation, centrifugation is conducted, precipitates are collected, and the squid skin chelated calcium peptide powder is obtained. According to the preparation method, the utilization rate of the squid skin leftovers is increased, and active substances contained in the squid skin leftovers are fully developed and utilized. Moreover, according to the embodiment, the operation is simple, and the prepared squid skin chelated calcium peptide powder has relatively strong oxidation resistance and relatively high calcium chelation rate, and the highest calcium chelation rate can reach 63.18%; and the calcium absorption rate and the calcium content are relatively high and can reach 77.14% and 65.82 mg / g respectively.

The invention relates to the technical field of fermentation, in particular to fermented lonicera caerulea juice capable of reducing astringency and increasing the content of organic calcium as well as a preparation method and application of the fermented lonicera caerulea juice. The fermented lonicera caerulea juice disclosed by the invention is prepared from the following components in parts by mass: 95 to 105 parts of lonicera caerulea pulp, 0.5 to 1 part of eggshell powder and 1 to 4 parts of fermentation bacteria. The calcium content in the fermented lonicera caerulea juice prepared by the method disclosed by the invention can be up to 2000mg / L, bitter and astringent substances such as ellagic acid and secologanin are effectively reduced, the bitter and astringent taste is improved, and the roundness and aroma acceptance of the whole taste are improved. The obtained lonicera caerulea fermented juice is pleasant in flavor, balanced in nutrition, high in calcium content and suitable for development of functional beverages and healthy food.

The invention relates to the technical field of macromolecule and aerogel materials, in particular to a chitin / chitosan aerogel material compounded with biomass calcium carbonate and a preparation method of the chitin / chitosan aerogel material. Comprising the following steps: deproteinizing, decoloring, preparing a chitin or chitosan raw material containing biomass calcium carbonate, preparing a biomass calcium carbonate / chitin or biomass calcium carbonate / chitosan solution, and preparing the biomass calcium carbonate / chitin or biomass calcium carbonate / chitosan aerogel material. The raw materials used in the method are wide in source, the content of biomass calcium carbonate is high, good biocompatibility is achieved, no extra filler needs to be added, the utilization rate of marine waste can be increased, and carbon emission generated by removing calcium carbonate and use of chemical reagents are reduced. The aerogel prepared in the invention has low density and good mechanical properties, the fire resistance and mechanical properties of the aerogel are improved, and the aerogel has wide application prospects in the fields of electromagnetic shielding, tissue regeneration and the like.

The present invention relates to a ceramsite production process, and belongs to the technical field of ceramsite preparation, the ceramsite production process comprises the following steps: S100, tailings and muck are crushed and ground to obtain tailings powder with a particle size of not more than 200 meshes, muck powder, the tailings powder, the muck powder and sludge are mixed to obtain a mixture, the water content of the mixture is not higher than 20%, and the calcium content of the mixture is not higher than 8%; s200, the mixture is sent into an aging room to be aged, the aged mixture is sent into a granulator to be granulated, the granulated raw material balls are sent into a dryer to be dried, and the dried material balls are sent into a cascade type rotary kiln to be roasted; and S300, the pellets obtained after high-temperature roasting and melting fall into a cooling machine to be cooled, the cooled ceramsite is screened out of different specifications according to market requirements, packaged and then fed into a finished product storage area to be stored, and the technical problem that tailings and sludge cannot be perfectly treated in the prior art can be solved.

Lactose-free high-calcium milk having double calcium content and a preparation method therefor. The calcium content in the milk is 200 mg / 100 mL or above; the problem of particle precipitation caused by externally added suspended calcium is solved by using a stabilizer and a phosphate, and the problem of fat floating is solved by optimizing the preparation process; lactase is used to achieve zero lactose and generated galactooligosaccharide promotes high calcium absorption, and the browning degree of milk is also reduced, resulting in less observed fat floating in the milk.

The invention provides a moulting feed for laying hens and an artificial moulting method for quickly recovering high yield, and the moulting feed for laying hens comprises the following raw materials in parts by mass: 7-8 parts of Chinese prickly ash seeds, 20-22 parts of crude protein feed, 0.5-2 parts of yeast culture, 2-4 parts of threonine residues, 8-10 parts of calcium-containing supplement, 0.1-1 part of soybean oil, 50-65 parts of corn and 2-3 parts of LD625. Wherein the content of crude protein is 15%-16%, and the content of calcium is 3%-4.0%. The specific formula of the laying hen moulting feed is optimally designed, and the illumination intensity and time in the moulting process are regulated and controlled, so that the second laying rate can quickly reach the peak and the second laying peak lasts for a long time after primary artificial moulting, and the laying rate of laying hens can reach the peak after secondary artificial moulting. The third-time egg laying rate can quickly reach the peak, the duration time of the third-time egg laying peak is long, the continuous and excellent egg laying effect is achieved, the moulting cost is reduced, the breeding period is prolonged, and application and popularization are facilitated.

The invention provides a probiotic fermentation and bacterial powder compound addition chewable tablet and a preparation method thereof, and belongs to the technical field of microorganisms, the preparation method comprises the following steps: respectively adding water into apple peel, cerasus humilis fruits and aronia melanocarpa fruits, pulping, and mixing in proportion to obtain mixed fruit pulp; a mixed bacterium solution of lactobacillus plantarum LNJ-HQ-01 and lactobacillus fermentum BNCC194390 is added into the mixed fruit pulp, and fermentation is performed; freeze-drying and grinding the fermented fruit pulp to obtain freeze-dried fruit powder; the preparation method comprises the following steps: respectively activating lactobacillus plantarum LNJ-HQ-01, lactobacillus acidophilus BNCC186447 and lactobacillus rhamnosus ATCC7469, performing enlarged culture, taking bacterial sludge, uniformly mixing the bacterial sludge with a freeze-drying protective additive, and performing freeze-drying to obtain freeze-dried bacterial powder; and uniformly mixing the fruit powder, the freeze-dried bacterial powder and the medicinal auxiliary materials, and tabletting to obtain the probiotic chewable tablets. The probiotic chewable tablet is high in dietary fiber content, effective calcium content and total phenol content, high in oxidation resistance and suitable for calcium supplement of special groups such as diabetics and the like.

The invention relates to a pellet and a preparation method thereof, and relates to the technical field of calcium carbide preparation, the pellet comprises the following components in parts by mass: 5.2-8.3 parts of calcium carbonate crystal, 56.8-59.7 parts of calcium oxide, 32.0-37.5 parts of calcium hydroxide, and 0.6-0.9 part of carboxylation modified lignin; the preparation process comprises the steps of raw material pretreatment, mineralization slurry preparation, mineralization and curing. According to the pellet and the preparation method, the active lime screen underflow serves as a calcium source, a stable structure with high strength and multistage pores is constructed on the molecular scale by adopting the biomimetic mineralization principle, and the pellet cracking risk is effectively reduced; meanwhile, an inert binder does not need to be added, effective calcium content dilution is avoided, the high-temperature smelting working condition of the distribution stone is adapted, and the production cost is remarkably reduced.

The invention discloses a method for removing calcium from high-calcium black talc, and relates to the technical field of chemical engineering, and the method for removing calcium comprises the following steps: S1, preparing black talc ore, screening the ore in a magnetic separation manner to remove magnetic impurities and increase the purity of the black talc ore, and crushing, ball-milling and sieving the screened black talc ore with a 100-mesh sieve to prepare black talc powder; s2, adding water into the black talcum powder to form slurry; s3, performing a hydrochloric acid content adding test, and analyzing based on big data to obtain the influence of proportioning results of different hydrochloric acid contents on the slurry, so as to obtain the optimal hydrochloric acid adding content; adding industrial hydrochloric acid into the slurry, and reacting for 30 minutes; the method for removing calcium from the black talc is low in cost, high in efficiency, free of pollution, simple in process and suitable for industrial application, the problem that the content of calcium in the black talc is too high and the problem of pollution emission in the treatment process can be solved, the mining economic benefits are improved, and better industrial use prospects are brought.

The invention relates to the technical field of chemistry, in particular to a method for preparing magnesium hydroxide from a magnesium salt solution through a gaseous ammonia precipitation method, and the method is particularly suitable for extracting magnesium hydroxide from multi-component water mineral raw materials with high calcium content. The method comprises the following steps: in a nitrogen or inert gas atmosphere, introducing gaseous ammonia into a magnesium salt solution (comprising a multi-component water mineral raw material containing high-concentration calcium), and controlling the molar ratio of NH to Mg to be 2.5: 1-4: 1, so that magnesium hydroxide is precipitated and separated out; and after the precipitation process is completed, filtering and washing under the same atmosphere, and drying and crushing the obtained product. The method can realize one-step high-efficiency separation of magnesium hydroxide, and is also suitable for taking a multi-component natural mineral raw material with high calcium content as an initial solution.

The invention discloses a method for preparing water-soluble oyster powder through enzyme-acid hydrolysis. The method comprises the following steps: step 1, cleaning and drying oyster shells, and grinding and sieving the oyster shells to prepare oyster shell powder; step 2, carrying out two times of enzymolysis on the oyster shell powder by using neutral protease to prepare enzymatic hydrolysate; 3, adding acetic acid into the enzymatic hydrolysate for reaction, and filtering to obtain filtrate; and 4, refrigerating the filtrate at an ultralow temperature, and performing freeze-drying treatment to obtain the water-soluble oyster powder. The water-soluble oyster powder is prepared by adopting a safe and efficient enzyme-acid hydrolysis method, so that the absorption rate and the bioavailability of calcium in oyster shells by a human body are effectively improved. Meanwhile, optimal preparation process parameters of the preparation method are obtained through a large number of experiments, the calcium content of the obtained water-soluble oyster powder solid powder reaches 90.12%, the amino nitrogen content is 20.0 mg / g, the solubility is improved to 42.56 g / 100 ml, and the preparation method has very important significance on further expanding resource utilization of waste oyster shells.

A system and method for process water and oxide coating recovery and distribution in a direct reduction system, such as a system for producing direct reduced iron. A warm lime softener is used to remove (recover) calcium, alkalinity, and other constituents from the process water system and to produce an effluent that can be further processed and returned as makeup to the process water system. The lime softening process requires lime (or similar material) to be added to the influent, thereby increasing the calcium and pH levels until they become supersaturated and precipitate. This chemical process results in effluent that is low in calcium, alkalinity, and total suspended solids.

The invention belongs to the technical field of solid waste treatment, and particularly discloses a preparation method for increasing the content of soluble calcium in fish bones. The method comprises the following steps: pretreating fish bones to obtain fish bone powder; mixing fish bone meal and water, and sterilizing to obtain a fermentation substrate; according to the method, bacillus subtilis, lactobacillus plantarum and saccharomycetes are adopted for multi-strain sequential fermentation, the bacillus subtilis is inoculated firstly for ventilation fermentation for 2-4 days, the pH is adjusted to 6.5-7.0, then sterilization is performed, a carbon source is added, a mixed bacterium solution of the lactobacillus plantarum and the saccharomycetes is inoculated, and ventilation fermentation is performed for 2-4 days. Through a specific strain combination and an innovative sequential fermentation process, the enzyme production capacity of bacillus subtilis and the acid production capacity of lactobacillus plantarum and saccharomycetes are remarkably improved, dissolution of calcium in fish bones is synergistically promoted, the problem of bitter taste generated by a traditional enzymolysis method is avoided, and the method has the advantages of high efficiency, greenness and complete nutrition retention.

The invention provides a planting method of hydroponic lettuce, and relates to the technical field of vegetable cultivation. According to the planting method for hydroponic lettuce, after field planting and hydroponic culture are conducted on lettuce seedlings, a combined artificial light source with the red-blue light ratio being (3-7): 1 is adopted for irradiation; the EC value of the nutrient solution after field planting and before harvesting is 0.8-1.5 mS / cm. According to the planting method of the hydroponic lettuce, after the lettuce seedlings are subjected to field planting and hydroponic culture, red and blue light quality regulation and nutrient solution concentration adjustment are added, a hydroponic lettuce growth synergistic system is constructed through the red and blue light quality regulation and nutrient solution concentration adjustment, the growth system is optimized, high-quality growth of the hydroponic lettuce is achieved, synthesis of secondary metabolites is stimulated, and the yield of the hydroponic lettuce is increased. Flavor substances are accumulated, the vitamin content is increased, and the nitrate content is reduced, so that the lettuce quality is improved, the calcium content is increased, the transpiration is enhanced, and the problem of edge burning is effectively solved.

Provided are: an admixture for concrete that eliminates the need for dedicated equipment for carbon dioxide fixation; a production method therefor; concrete that includes the admixture; and a production method therefor.　An admixture according to the present invention is produced by reacting a by-product obtained in a quicklime production step with water and carbon dioxide and contains calcium in an amount of not more than 35 mass%. A method for producing the admixture comprises: a first step for reacting water with a raw material which is a by-product obtained in a quicklime production step; and a second step for reacting, with carbon dioxide, a product obtained in the first step.

The invention relates to a glass batch for a glass article. The glass batch comprises, by weight, a first raw material group containing 0-65% SiO2, a second raw material group containing 5-60% AI2O3, a third raw material group containing 10-45% MgO, a fourth raw material group containing 0-13% CaO or CaCO3, a fifth raw material group containing 0-20% Na2CO3 and / or 10-30% Na2O or combinations thereof, and a sixth raw material group containing 0-5% B2O3.

The present invention relates to a process for preparing a surface treated calcium carbonate-comprising material, a surface treated calcium carbonate-comprising material obtained by the process, an article comprising the surface treated calcium carbonate-comprising material, a polymer composition and the use of the surface treated calcium carbonate-comprising material in a polymer composition.

The invention discloses a cultivation method for enhancing the total amount of bio-available calcium of edible parts of pakchoi, and relates to the technical field of Chinese cabbage cultivation, and the method comprises the following steps: variety screening, seedling raising, transplanting, foliar fertilizer spraying, cultivation and picking. Through the design of high-calcium variety screening, calcium nutrition pretreatment in the seedling raising period, foliar calcium supplement and potassium fertilizer synergistic application, the calcium content of the edible part of the pakchoi is increased, more importantly, the absorption, transport and accumulation process of calcium in the plant body is optimized, the total amount of bio-available calcium which can be actually absorbed and utilized by the human body in the edible part is increased, and the yield of the pakchoi is increased. The problem that an existing calcium fertilizer application and biological enhancement technology cannot guarantee effective calcium absorption of a human body is solved. Aiming at the problems of low absorption efficiency of traditional soil calcium fertilizer application and lack of systematicness of a foliar calcium fertilizer technology, through pretreatment of an EDTA calcium complex in a seedling raising period, precipitation which is difficult to absorb and formed by combination of calcium and other substances in soil or a matrix is avoided, and an efficient calcium absorption basis is constructed for seedlings.