160results about How to "Increase Potassium" patented technology

The invention relates to a high-potash fertilizer special for tobaccos, comprising the following ingredients in percentage by weight: 35-63 percent of humus organic carriers, 35-60 percent of potassium sulphate, and 2-8 percent of polyacrylamide and / or super absorbent resin. The high-potash fertilizer special for tobaccos has the advantages of improving the potassium content of tobacco leaves, increasing soil organic matters, improving the nutrient availability in the soil, promoting the root system growth of tobacco plants, evidently enhancing the potassium content of the tobacco leaves, improving the quality of the flue-cured tobacco leaves and increasing the aroma content; the application of the high-potash fertilizer special for tobaccos can reduce dependence on normal potash fertilizer or improve the use efficiency of the normal potash fertilizer. Applying the high-potash fertilizer special for tobaccos as a base fertilizer at the use level of 30-50 kg / 667 m<2> for one time can satisfy the potassium absorption requirements in the entire growing period of the tobacco leaves without applying the additional potash fertilizer in later period, thereby saving time and labor.

A salt replacing composition for replacing sodium chloride in food contains a major amount of potassium chloride, ammonium chloride and at least one of an amino acid and a salt of an amino acid. A reduced sodium chloride composition contains the salt replacing composition and sodium chloride. A food containing the salt replacing composition and a process for making the salt replacing composition.

The invention belongs to organic fertilizer, and in particular relates to organic fertilizer for killing underground injurious insects and a preparation method thereof. The organic fertilizer comprises the following components in part by weight: 1000 parts of tobacco stalk, 25 to 30 parts of dry livestock manure, 5 to 10 parts of urea and 3 to 5 parts of solid high-efficient microorganism zymogeneous bacteria. The preparation method comprises the following steps that: the tobacco stalk is smashed; the livestock manure is dried and dehydrated; the urea is added to be uniformly mixed; the zymogeneous bacteria is inoculated; the moisture and the pH value are adjusted, fermentation stocks are piled up, and black plastic film covers the fermentation stocks, so the fermentation stocks are undertaken the anaerobic fermentation; after the temperature is increased, the stocks are turned for a plurality of times until the materials are fermented and matured and the size is reduced to two thirds of that of the original stocks; and the fermented stocks are naturally ventilated and dried and are bagged to store. The organic fertilizer has the advantages that the fertilizer efficiency is high, the underground injurious insects can be killed, the content of the organic colloid of the soil is increased after the application of the fertilizer, the fertilizer and water maintaining capacity of the soil is improved, the period of validity of the fertilizer is prolonged, and the probiotics in the soil can be compensated.

A tobacco foliar fertilizer and a preparation method thereof. The tobacco foliar fertilizer includes following components, by weight: 20-25 parts of potassium tripolyphosphate, 15-20 parts of potassium citrate, 3-6 parts of sargassum fermentation extract, 0.5-2 parts of glutathione, 0.5-2 parts of [beta]-deoxyglucose, 0.1-1 part of trans-abscisic acid, 0.5-1 part of xylooligosaccharide, 0.2-0.5 parts of salicylic acid, 1-3 parts of boric acid, 0.1-0.5 parts of ammonium molybdenate, 0.5-2 parts of EDTA-chelating zinc, 0.5-2 parts of EDTA-chelating magnesium, 0.3-2 parts of EDTA-chelating manganese, 0.3-1 part of EDTA-chelating copper, 0.5-1 part of alkyl polysaccharide glycoside and 31-56.2 parts of water. The tobacco foliar fertilizer is reasonable in combination and proportion, can promote growth of tobacco, can enhance the resistance capability on viruses, cold and dryness of tobacco, can increase yield, is green and environmental-friendly and can greatly improve quality of tobacco.

PCT No. PCT / FI95 / 00329 Sec. 371 Date Mar. 10, 1997 Sec. 102(e) Date Mar. 10, 1997 PCT Filed Jun. 7, 1995 PCT Pub. No. WO96 / 00776 PCT Pub. Date Jan. 11, 1996The invention relates to a process for fractioning vinasse, in which process the pH value of the vinasse is lowered by adding acid, and the formed precipitate is separated in order to obtain an inorganic fraction, whereupon an organic fraction remains. The invention also relates to the products obtained. The inorganic fraction mainly contains potassium salt, and it is useful for example as a fertilizer. The organic fraction mainly contains organic acids, and it is useful for example as an additive in animal feed and in producing silage.

The invention relates to a special cultivation substrate for fruit type organic vegetables and a preparation method of the special cultivation substrate. The cultivation substrate comprises the ingredients including edible fungus residues, oil residues, furfural residues, microbial fermentation inoculant, azotobacteria inoculant, potassium bacterium inoculant, potassium feldspar powder and expanded perlite. Different organic wastes are used for compounding, the microbial fermentation inoculant is added, the sterilization is carried out after fermentation decomposing, then, the azotobacteria inoculant and the potassium bacteria inoculant are inoculated, potassium-containing minerals are added, the inorganic medium expanded perlite is compounded, and the special cultivation substrate for the fruit type organic vegetables is prepared. The substrate contains a large number of azotobacteria, the effective nitrogen and potassium content in the substrate is obviously increased through potassium bacteria, the vegetable yield is increased, the product quality is improved, and meanwhile, the organic cultivation requirements are met.

The invention provides a water-solubility instant potassium sulfate fertilizer and belongs to the technical field of an agricultural fertilizer. Agricultural potassium sulfate is purified by adopting a recrystallization process of 'heat dissolution and cold crystallization', and insoluble matter is removed out of water, so as to obtain high-purity crystal potassium sulfate; 0.1-3% of component A, 0.5-5% of component B and 0-1% of component C are added; the component A is a dispersant and water softener; the component B is an acid providing agent; and the component C is a wetting agent. The instant potassium sulfate fertilizer is packaged in mechanical mixing and drying manners. By adopting the method provided by the invention, the content of the insoluble matter can be effectively reduced, the dissolution degree is quickly improved, and the water-solubility instant potassium sulfate fertilizer is simple in technological process and has strong practical value. The product disclosed by the invention can be widely applied to agricultural facilities integrated with foliage spraying, trickle irrigation, sprinkling irrigation and the like.

The invention discloses a dedicated slow-release potash fertilizer for tobacco and a preparation method. The conventional potash fertilizer as a slow-release fertilizer center is wrapped by the compound of inorganic membrane material and organic materials as coating material to form micro-capsules, the product becomes grain after being dried, and the grain size is 3mm to 5mm; the weight of the coating material accounts for 30 to 50 percent of the total weight of the fertilizer; the weight of the inorganic membrane material accounts for 80 to 90 percent of the weight of the coating material, and the weight of the organic materials (including organic membrane material, binder and sealing agent) accounts for 10 to 20 percent of the weight of the coating material; the inorganic membrane material and the organic membrane material are first mixed at high speed, the conventional potash fertilizer and the mixture are then sequentially added into a rotary pelleting machine, pelleted and coated, meanwhile, the corresponding binding solution is sprayed in good time, and finally, the sealing agent is sprayed. Under the condition of little applied dose, the dedicated slow-release potash fertilizer for tobacco can increase the content of potassium element in the upper and the middle leaves of flue-cured tobacco by more than 30 percent; and meanwhile, in comparison with other slow-release potash fertilizers, the dedicated slow-release potash fertilizer for tobacco greatly simplifies the production process, and reduces the production cost.

The invention provides a fertilizing method for planting cigar tobacco. The fertilizing method comprises the following steps of: firstly, early fertilizing base fertilizer: in 20-30 days before transplanting, trenching on the formed land with the interval of 110cm, the depth of 10-15cm and the width of 8-10cm, uniformly paving the base fertilizer at the bottom of the trench and ridging; secondly, applying seedling protecting fertilizer for transplanting: when small cigar seedlings are transplanted, dissolving ammonium nitrate into water, injecting the mixed solution and pesticide as transplanting water into the root parts of the seedlings, wherein 3-5kg of ammonium nitrate is fertilized in each mu; thirdly, irrigating roots by using seedling restoring fertilizer: in about 7 days after the tobacco seedlings are transplanted, irrigating the roots by using 5-7g / mu of potassium nitrate and an insect infestation resisting pesticide and then covering a layer of fine soil around tobacco roots; fourthly, timely applying seedling eccentric fertilizing; fifthly, digging holes and applying and burying growth flourishing fertilizer and irrigating by matching the growth flourishing fertilizer with biogas slurry; and sixthly, carrying out additional fertilizer and spraying at the mature stage. The fertilizing method disclosed by the invention has the advantages of simplicity in operation, standard specification, strong pertinency and greatly-improved yield and quality of cigar tobacco.

The invention adopts the technical scheme that: a konjac seed coating agent comprises the following components by weight: 20 percent to 45 percent of plaster, 15 percent to 40 percent of adamic earth, 20 percent to 45 percent of plant ash with the carbon content being more than or equal to 15 percent, 0.1 percent to 0.5 percent of sulfur, 0.05 percent to 0.15 percent of Sanmate, which are made into powder to be pulped. The coating method of the konjac seed coating agent is that: the pulp which is obtained in the scheme is arranged inside a vessel, selected konjac seeds are arranged inside a bamboo basket, and then the bamboo basket is arranged inside the vessel, so the konjac seeds can be immersed in the coating agent. After being immersed for 1 minute to 5 minutes, the konjac seeds are taken out of the vessel, and the fluid coating agent on the surface of the konjac seeds is flushed and filtered. The coating layer is attached onto the surfaces of the konjac seeds, so not only can the insecticidal effect and the sterilization be realized, but also the external bacteria or the bacteria spread in the air can be prevented from infringing in the konjac seeds during the storage period, the konjac seeds are not easily influenced by the low temperature, and the warmth retention and freeze prevention of the seed konjac can be facilitated.

This invention discloses a method of using an aldosterone antagonist such as spironolactone, at a dosage which does not disrupt a patient's normal electrolyte and water-retention balance, to inhibit myocardial fibrosis, including left ventricular hypertrophy (LVH).

The invention discloses a nitrogen, phosphorus and potassium compound fertilizer for a tobacco 97. The compound fertilizer comprises the following single fertilizers in percentage by weight: 13 percent of ammonium nitrate, 38 percent of diammonium phosphate and 49 percent of potassium sulfate. Every 40 to 50 kilograms of the compound fertilizer contain 10 kg / 667m<2> of potassium nitrate and 15 kg / 667m<2>. After the compound fertilizer is used, the whole tobacco plant grows well and has high disease resistance, in particular high pectobacterium atrosepticum resistance; respective agronomic trait values are high; and the length and the width of the waist are increased by 7.69-9.45 percent and 2 to 3.22 percent respectively.

The invention discloses a special fertilizer formula for stevia rebaudiana, which is prepared by taking the following components in parts by weight as raw materials: 35-40 parts of organic material, 15-20 parts of nitrogen fertilizer, 10-15 parts of phosphorus fertilizer, 15-22 parts of potassium fertilizer, 3-8 parts of medium trace elements and 5-10 parts of mineral conditioner. In the fertilizer formula, according to the nutritional requirements for the growth of stevia rebaudiana as well as the soil characteristics of the soil in the fertilizer application regions, namely coastal regions in Shandong and Jiangsu, the fertilizer utilization rate is improved to the greatest degree, the crop growth is promoted, and the output and quality of stevia rebaudiana are improved. Meanwhile, after sugar is extracted by use of a water solvent, by taking the stevia rebaudiana residue after aerobic fermentation and thorough decomposition as an organic raw material, environmental pollution is avoided, the production cost is reduced, and the benefits are increased.

The invention relates to a method for producing water-soluble potassium ammonium phosphate from wet-process phosphoric acid. According to the method, a monoammonium phosphate solution is prepared from low-cost wet-process phosphoric acid as the raw material by the steps of desulfuration and defluorination and neutralization with ammonia; then the replacement reaction of the monoammonium phosphate solution and potassium chloride and the crystallization are carried out to obtain a water-soluble fertilizer which contains potassium dihydrogen phosphate as a main component and adopts ammonium dihydrogen phosphate as an auxiliary component, wherein the content of chlorine is smaller than 2%; and excess potassium chloride and nitrogen produce a by-product such as nitrogen phosphorus and potassium chloride water soluble compound fertilizer. Meanwhile, the by-product in the production process can be directly used as a citric acid soluble phosphatic fertilizer. The method has simple processes, and the prepared water-soluble ammonium potassium dihydrogen phosphate is high in purity, nutrient and potassium content. No waste residues are discharged in the whole process, so that the method is environment-friendly and has better social and economical benefits.

The present invention is spherical plant foliar fertilizer especially used for flue-cured tobacco, which is basically composed of the following substances: fulvic acid, zinc sulfate, copper sulfate, ferrous sulfate, boric acid, potassium dihydrogen phosphate, potassium nitrate, rooting powder, ammonium molybdate and acetic acid. Wherein, the ferrous sulfate refers to the ferrous sulfate heptahydrate; the copper sulfate refers to the copper sulphate pentahydrate; the zinc sulfate refers to the zinc sulfate heptahydrate; the acetic acid refers to the acetic acid glacial; the ammonium molybdate and the boric acid are without crystal water. The production method of the foliar fertilizer is as follows: first, a certain amount of 36% acetic acid is added to the mixture of the 25 g / L fulvic acid, followed by zinc sulfate, copper sulfate, ferrous sulfate, boric acid, potassium dihydrogen phosphate and potassium nitrate in sequence, and then 0.1% alcohol containing 5g / L rooting powder is also added to the 25 g / L fulvic acid; then, upon ongoing stirring, 145g / L ammonium molybdate is slowly added to the mixture of the 25 g / L fulvic acid; the mixture is then shaken up and filled into a glass or plastic bottle(do not use metal containers), and then the bottle is sealed, and the spherical plant foliar fertilizer is thus obtained. Compared with the similar foliar fertilizer, the foliar fertilizer provided by the invention can significantly promote the growth and development in tobacco plant resettling period and budding period, markedly increase the yield and value of flue-cured tobacco, significantly increase potassium content of flue-cured tobacco and reduce chlorine content to enable more moderate nicotine content and coordinated chemical composition of tobacco leaves. Therefore, the invention has significant economic and social benefits.

The invention discloses a complex microbial inoculant for promoting wheat growth and an application thereof. The complex microbial inoculant is prepared by mixing and fermenting an Azotobacter chroococcum N24 bacterial solution, a rhizobium radiobacter J16 bacterial solution and a Klebsiella quassicola P5 bacterial solution. According to the invention, nitrogen-fixing bacteria N24, potassium bacteria J16 and phosphate solubilizing bacteria P5 are separated from rhizosphere soil of wheat, the complex microbial inoculant prepared by mixing and fermenting the three bacterial solutions simultaneously has the functions of nitrogen fixation, phosphorus dissolution and potassium dissolution, the contents of available nitrogen, available phosphorus and available potassium in soil can be greatly increased, the plant height, the fresh weight, the dry weight, the nitrogen content, the phosphorus content and the potassium content of plants are remarkably increased, the plant growth is promoted, the use amount of chemical fertilizers is reduced, the crop yield is increased, and the method has important significance in agricultural production.

A salt substitute composition is provided. The salt substitute composition has an amount of potassium chloride and an amount of N-[N-(3,3-dimethylbutyl)-L-α-aspartyl]-L-phenylalanine 1-methyl ester or neotame. The N-[N-(3,3-dimethylbutyl)-L-α-aspartyl]-L-phenylalanine 1-methyl ester is present in an amount of about 0.001 wt % to about 0.02 wt % of the total weight of the composition. The amount of N-[N-(3,3-dimethylbutyl)-L-α-aspartyl]-L-phenylalanine 1-methyl ester is optimized for reducing the undesired aftertaste of the potassium chloride.

The invention relates to a method for the treatment of organic process waste liquid of high-acidity black ammonic sugar, especially to a method for the preparation of high-activity compound organic fertilizer by waste acid liquid of D-glucosamine hydrochloride. The method for the preparation of high-activity compound organic fertilizer by waste acid liquid of D-glucosamine hydrochloride comprisesthe following steps of: concentrating waste mother liquid to recover hydrochloric acid, neutralizing dregs and slurry with KOH alkali liquor; adding chitosan to neutralized liquid for being stirred and sufficiently dissolved; heating up and adding the neutralized liquid with mixed enzyme for enzymolysis, and then destroying enzyme; regulating PH with the KOH alkali liquor and simultaneously adding missing microelement-containing organic compound; and pump-filtering the above liquid and using the liquid as fertilizer after filtration or as solid fertilizer after drying. The compound chitosan fertilizer of the invention is suitable for the growth of various crops and the improved soil, thereby zeroing waste water discharge and changing economic environment. The method is simple in operation, convenient for being performed and suitable for the conversion of a large amount of waste water into fertilizer.

The invention describes the preparation of nutrient-rich salt from high salt-accumulating and edible oil-bearing salt tolerant plants in a way that allows simultaneous recovery of both salt and oil. The plants are routinely irrigated with seawater and occasionally with seawater enriched with salt bitterns and / or other types of wastes / by-products containing essential nutrients to raise the level of such nutrients in the plant.

A water-holding controlled release fertilizer for tobacco exclusively and a preparation method thereof are provided. The water-holding controlled release fertilizer includes the following materials by the weight percentage: 2 percent to 4 percent of sand grains, 10 percent to 14 percent of lemery, 10 percent to 14 percent of potassium nitrate, 10 percent to 14 percent of diammonium phosphate, 22 percent to 26 percent of cake fertilizer, 0 percent to 4 percent of zinc sulfate, 0 percent to 0.4 percent of sodium molybdate, 20 percent to 24 percent of adhesive A, 10 percent to 14 percent of adhesive B and 1 percent to 3 percent of water retention agent. The invention adopts the method that the water retention agent is at the outmost layer so that the water retention layer absorbs water at first. The water retention layer does not contact chemical fertilizer directly. The influence of the chemical fertilizer on the absorbing effect of the water retention agent is reduced. At the same time, according to the balanced fertilization principle of cured tobacco, the kind and the quantity of the deficient element of tobacco soil is supplemented. Hereby, the compound fertilizer especially for cured tobacco of the invention is designed and manufactured. By fixing the grain diameter of a core, nutrition dissolution property is changed by fertilizer enwrapping method in order to control the release of potash fertilizer effectively. Moreover, the water retention agent absorbs water, which consequently realizes the dynamic equilibrium of fertilizer release and plant absorption.

The invention belongs to the technical field of fertilizer, and more specifically relates to a tobacco special-purpose charcoal-based compound fertilizer, and a preparation method and an application method thereof. The tobacco special-purpose charcoal-based compound fertilizer comprises, by weight, tobacco straw, waste tobacco, pig manure, earthworm manure, vegetable waste, domestic garbage, nitrogen fertilizer, phosphate fertilizer, potassium fertilizer, trace element liquid fertilizer, a compound microbial agent, and an adhesive, and is prepared through a plurality of technologies. The tobacco special-purpose charcoal-based compound fertilizer is high in granulation rate, is capable of obviously improving fertilizer utilization rate, and is capable of improving soil acidifying and hardening after being applied to tobacco field, and increasing soil available nutrient content; the quality of the harvested tobacco leaves is improved obviously, the proportion of middle and upper-grade tobacco leaves is increased, the yield per mu and the output value per mu are obviously increased; and the tobacco special-purpose charcoal-based compound fertilizer is taken as a base fertilizer, onlyone time of application is capable of satisfying all the requirements of tobacco on nutrients in the tobacco growth period, reducing the using amount and the application frequency of traditional fertilizers; using is convenient; and labor is saved.

A preparation method of a high-potential cathode material of a lithium ion battery comprises the following steps: S1, dissolving potassium ferrocyanide in deionized water to form a solution A; S2, adding ferric salt as an iron source, potassium citrate, citric acid and iron powder in the deionized water to form a mixed solution B; S3, dropwise adding the solution A in the mixed solution B, and continuously stirring; S4, after reaction is finished, standing; and S5, collecting precipitates and drying the same. The preparation method is convenient to operate, low in cost and good in repeatability, the synthesized prussian blue is in nano scale, and the cycle performance of the lithium ion battery made from the cathode material can be improved.

The present invention relates to potash fertilizer production, and is especially the production process of non-crystalline silicon potash fertilizer. The present invention utilizes new type of catalyst in converting the crystalline structure of potash feldspar into non-crystalline structure, so as to make the potassium ion replaced easily with other cation to become effective potassium.

The invention discloses a preserved meat and a preparation method thereof, and relates to the technical field of processing of meat products. The raw materials of the preserved meat comprise selenium-containing pork and compound salt, wherein the selenium content of the selenium-containing pork is greater than or equal to 0.1 mg / kg; the compound salt comprises sodium chloride and potassium chloride, and in the compound salt, the mass percent of the potassium chloride is 35-30%. According to the technical scheme, the potassium chloride having the saline taste characteristic similar to salt is adopted for replacing part of sodium chloride, which effectively reduces the use amount of sodium salt in the preserved meat, makes eating healthier, also increases the potassium content in the preserved meat, and increases the nutritive value of the preserved meat; the selenium-enriched pork is adopted, so that the preserved meat contains selenium, and the nutritive value of the preserved meat isfurther increased.

The invention provides a silicon-element alkaline fertilizer for improving soil acidification and a preparation method of the silicon-element alkaline fertilizer. The silicon-element alkaline fertilizer comprises the following raw materials in parts by weight: 15-20 parts of potassium silicate, 20-25 parts of potassium humate, 15-20 parts of urea, 0.1-0.5 part of ammonium molybdate, 0.2-2 parts of ethylenediamine tetraacetic acid, 0.1-0.5 part of part of hexanoic,2-(diethylamino) ethyl estercitrate, 0.1-0.5 part of compound sodium nitrophenolate, 12-15 parts of powdered rock phosphate, 6-7 parts of calcium chloride, 5-7 parts of a natural potassium magnesium fertilizer and 18-20 parts of matured compost. By virtue of the silicon-element alkaline fertilizer, the acidified soil can be effectively improved; the pH of the soil is 6.8-7.0 after the silicon-element alkaline fertilizer is used for a year; the specific gravity of the soil is 2.63-2.64g / cm<3>; the volume-weight of the soil is 1.12-1.13g / cm<3>; and the total porosity of the soil is 57%-58%.

The invention relates to a method for improving saline-alkali soil to plant plants based on a prepared sludge nutrient substrate, and belongs to the technical field of sludge treatment and saline-alkali land treatment. The method comprises the steps that on the basis of the prepared sludge nutrient substrate, firstly, the sludge nutrient substrate is spread in the surface layer of the saline-alkali soil, and then ploughing, soil preparing and digging of parallel planting ditches are conducted; then the sludge nutrient substrate, a water retaining agent and crushed plant waste are mixed evenly, and sludge migrated soil is obtained; the sludge migrated soil is applied to the bottoms of the planting ditches to form the a migrated soil layer, plant seeds are sowed in the migrated soil layer, the upper side of the migrated soil layer is covered with non-woven fabric, and then regular irrigation and routine management are carried out. The method achieves the purposes of soil optimization and sludge treatment in saline-alkali land, soil optimization and sludge treatment are organically combined, environmental problems are solved by making full use of sludge wastes, and favorable conditions are provided for agro-forestry production.

The invention discloses a method for efficiently planting apples on saline and alkaline lands. The method is characterized in that according to growth and development characteristics of the apples, water and fertilizer characteristics of the saline and alkaline lands are combined, physical, chemical and biological control measures of the saline and alkaline lands and apple planting techniques areintegrated, the saline and alkaline lands are pretreated by the aid of calcium super-phosphate cream powder, shell powder and compound microbial agents, livestock and poultry manure bio-organic fertilizers, nitrohumic acid and seaweed fertilizers are applied onto the saline and alkaline lands, soil structures of the saline and alkaline lands are effectively improved, a pH (potential of hydrogen) value of soil and salinity are reduced, the fertility of the saline and alkaline lands is improved, Chinese flowering crabapple seedlings are transplanted onto the saline and alkaline lands and then serve as stocks to graft the apples, so that the apples are efficiently planted on the saline and alkaline lands, and an efficient planting key technique system of the apples on the saline and alkalinelands is constructed. According to the method, the growth rate of the apples on the saline and alkaline lands can be remarkably increased, the yield of the apples and the quality of fresh apples are remarkably improved, and method is suitable for popularization and application in saline and alkaline areas.

The invention discloses a gene NtTPKa capable of increasing tobacco leaf potassium content and a cloning method and application of the gene NtTPKa. The nucleotide sequence of the gene NtTPKa is as shown in SEQ ID: No. 1. The cloning method specifically includes the steps of A, determining NtTPKa gene sequence; B, extracting tobacco RNA, and performing reverse transcription to obtain first chain cDNA; C, designing and synthesizing specific primers according to the NtTPKa gene sequence, and using the cDNA as the template to perform PCR amplification; D, recycling and purifying a PCR product, andconnecting the PCR product with a pTOPO vector. The cloning method has the advantages that the RNAi expression vector containing the NtTPKa gene is built, the RNAi vector is used to transform tobaccothrough an agrobacterium-mediated method to prepare a transgenic plant; the potassium content of the obtained transgenic plant is more than 20% higher than that of a control group; the result indicates that the gene NtTPKa is promising in application prospect in the cultivation of high-potassium-content tobacco.