244 results about "Pharbitis nil" patented technology

The invention discloses a processing method of purple sweet potato rice wine, which comprises the following steps: choosing purple sweet potato and glutinous rice as raw material; allocating with mass percent as 30-42% glutinous rice, 3. 0-5. 5% purple sweet potato, 3. 5-6. 5% barm and water; getting the product.

The invention belongs to production technology field of health products, specifically relates to a producing method of a batata fruit vinergar beverage and the products thereof. The purple tabata or purple tabata is used as raw material and saccharomyces cerevisiae and acetic acid bacteria are used as fermentation bacteria. The obtained tabata vinergar is mixed with strawberry juice, honey, sugar and water and then is subjected to degassing, sterilizing, cooling to produce a batata fruit vinergar beverage which can be directly drunk. The avail effects are: 1) saccharified purple tabata being used as culture medium to perform alcoholic fermentation and vinergar fermentation; 2) the purple tabata vinergar being mixed with strawberry juice, honey, sugar and water to give prominence to the brewage flavor of tabata vinergar and blending with the fruit fragrance of the strawberry juice, easy to be accepted by user; 3) being natural product rich in anthocyanin and vinegar and the other effective components.

The invention relates to a method for cultivating leaf sweet potatoes in a greenhouse of the north. The left sweet potatoes are introduced into the northeast for cultivation for the first time, and meanwhile a new concept is provided for comprehensive utilization of a rice seedling raising greenhouse of the northeast. According to the technical scheme, the method includes the high-quality seedling breeding process and the facility cultivation process of the leaf sweet potatoes in the northeast, wherein the seedling breeding process includes the steps of land selection and soil preparation, seed selection and seeding, seedbed management and seedling picking in good time; the facility cultivation process includes the steps of tillage mode and land selection, strong seedling breeding and planting, picking and pruning, topdressing and management and potato seed breeding.

The invention relates to a method for culturing sweet potatoes in a dry land, belonging to the technical field of methods for culturing the crops, and solving the technical problems that the existing method for culturing sweet potatoes in the dry land is unreasonable and has low yield. The technical scheme of the invention is as follows: 1) culturing seedlings: mixing animal wastes with crushed crop straws uniformly according to proportion to prepare padding materials in late March, laying the padding materials on a seedling-culturing bed, then laying river sand, placing sweet potato seeds, then using the river sand to cover the sweet potato seeds, and controlling proper temperature till the seedlings of the seeds grow out; 2) preparing the land and applying fertilizer: after the rains in late March, applying decaying farmyard manure, then ploughing and levelling the land, marking rows and applying potash fertilizer, then leveling again, and covering with thin films; and 3) culturing: from late April to early May, perforating on the thin films and culturing. The method has the advantages of high rate of emergence, capability of maintaining soil moisture, low labor intensity for sweet potato farmers, high yield and the like.

The invention provides a preparation method for rooted vegetable black pickles and the black pickles prepared by the method. The preparation method comprises the following steps: cutting raw materials comprising root vegetables comprising radish or carrot or kohlrabi or Chinese artichoke or rutabaga or horseradish or alpinia japonica or sweet potato or dasheen or hot pickled mustard tuber head or potato or yam or burdock or platycodon grandiflorum into blocks or strips; and pickling, airing, fermenting and packaging. The fermented black pickles can completely eliminate the uncomfortable taste of the common raw pickles, so that the finished product is salty, sweet, fresh, fragrant and delicious, and the pickles are tender and smooth and particularly suitable for old people and people with bad teeth.

The invention discloses an industrial production method for extracting a natural purple sweet potato coloring matter for food from edible purple sweet potato. The method comprises the following steps of: (1) pre-treating the purple sweet potato, namely cleaning and crushing the purple sweet potato; (2) extracting the purple sweet potato coloring matter, namely extracting the coloring matter in acidic aqueous solution with stirring and settling and separating the extract; (3) performing adsorption refining of the purple sweet potato coloring matter, namely filtering the extract and squeezing the filtered extract into a macroporous adsorptive resin column to adsorb the coloring matter, and leaching the resin with water; (4) concentrating and purifying the purple sweet potato coloring matter, namely adding ethanol into the leached resin column for analysis, concentrating the obtained analytical liquid under vacuum, adding de-ionized water into concentrate to adjust the concentration, andperforming ultrafilteration and removing impurities; and (5) performing spray drying to obtain the powdery purple sweet potato coloring matter. By using the method, the yield of the purple sweet potato coloring matter is high, peculiar smell is not generated, colourity recovery rate is over 90 percent and three wastes (waste water, waste gas and industrial residues) are not generated.

The invention discloses a high-yield cultivation method for sweet potatoes. The high-yield cultivation method comprises the following concrete steps: I, choosing an improved variety: the improved variety is the key to produce the sweet potatoes at high yield; according to the use and the sale, the improved variety is chosen in the light of local conditions, and especially, the new variety is particularly obvious in yield-increasing effect; II, cultivating strong seedlings: the roots of the strong seedlings are numerous and developed, after being planted, the seedlings survive quickly, and hair roots bear the sweet potatoes fruitfully, which lay the foundation for full stands, strong plants, numerous potatoes and big potatoes; the standards of the strong seedlings are shown as follows: thick and strong stems, short internodes, fat blades and moderate sizes, with the features of the improved variety, no diseases, plenty latex of cuts, 50cm to 70cm of vine length and more than 0.5cm of stem thickness; III, transplanting in real time; IV, performing scientific management; V, harvesting the sweet potatoes when potato leaves start to turn yellow and the air temperature is below 20 DEG C, wherein the sweet potatoes require to be harvested before the end of October, and potato tubers should be prevented from being damaged by digging during harvesting. The high-yield cultivation method disclosed by the invention has the advantages that seeds are saved by more than 1 / 3, the buried section number of seedling vines is large, covering of soil is slight, the soil temperature is high, and after ventilation, the survival rate is high.

The invention discloses a root vegetable vinasse-made flavor food and a processing method thereof. The method is characterized by comprising the following steps: completely washing radish, white radish, carrot, kohlrabi, preserved pickle head, Chinese artichoke, ginger, allium chinensis, rutabaga, horseradish, Alpinia japonica, garden beet, jerusalem artichoke, sweet potato, Chinese eddo, potato, Chinese yam, burdock or platycodon grandiflorum; cutting the material into sheets or strips; airing, pickling, seasoning, packaging and sterilizing to obtain the food. The process is simple and convenient to operate. The product is delicious, crisp, tender and fragrant, has unique flavor, unique wine flavor and pleasant mouthfeel, can be eaten as soon as being opened, is a convenient and fashionable small delicacy for restaurant banquets and a fashionable table dish of farmhouse tables, is suitable for people's taste demand and suitable for all kinds of people to consume, and has a good market prospect.

The invention discloses a sweet potato cultivation method in hills and mountains, comprising the following steps of: A, selecting variety; B, raising seedlings: the seeding time is in March, the seeded potatoes are oblique in rows with head up and tail down, plant ash is covered after seeding, fine soil is covered, dual gold herbicide and glyphosate are sprayed on the ridges, and mulching film is coated; C, planting: considering that the blocks in hills and mountains have different sizes, micro-ridge single-row planting is adopted, the planting time of spring potato is in April, the planting time of summer potato is in May, the head and the middle of seedlings are cut, oblique planting is adopted, soil is covered, and moisture supply is maintained after planting; D, applying fertilizer: sweet potato is potassium-liking crop and the applied fertilizer is mainly organic fertilizer; and E, intertilling, weeding and earthing up: intertilling has the effect on breathing and is performed after planting, the depth becomes shallow, and weeding and earthing up are combined with intertilling. The method is easy and simple to operate, adopts micro-ridge single-row planting, efficiently uses the soil, causes the seedbed to be insulated, prompts the potato tubers to sprout quickly and abundantly, simultaneously can inhibit occurrence of black spot, and increases the yield by 20-30%.

The invention discloses a method for extracting ipomoes batatas L. anthocyanidins, which comprises the following steps: baking the ipomoes batatas L. by microwave, then placing the baked ipomoes batatas L. into acid electrolysis water, and repeatedly homogenizing and extracting, filtering, separating and drying the ipomoes batatas L. to prepare anthocyanidins powder. The method for extracting theanthocyanidins has the advantages of high efficiency, simple process, low cost and environmental protection; the obtained ipomoes batatas L. anthocyanidins extract has fresh and stable color; and thecontent of active ingredients such as total flavonoids, total phenols, total sugars and total monomer anthocyanidins and the like in the extract is higher. The ipomoes batatas L. anthocyanidins extract prepared by the method has stronger reducing power, capacity of eliminating free radicals and function of lipid peroxidation resistance in vitro, has quite obvious anti-oxidation effect in vivo, and can remarkably delay the ageing of the organism. The ipomoes batatas L. anthocyanidins extract can be widely used in the fields of food colorant, anti-ageing health-care food and the like.

The invention discloses a preparation method of a convenient instant purple potato food, which aims at solving the problems that the heating time of sweet potatoes is longer, the loss of nutritional ingredients in the sweet potatoes is greater and a preservative is further added in the prior art. The method comprises the following steps: (1) selecting materials, cleaning and cutting; (2) performing primary film coating; (3) performing secondary film coating; and (4) sterilizing and cooking. A product is obtained by uniformly coating an edible pectin compound twice, packaging, sealing, sterilizing and cooling, the texture and the color of the product are kept good, the loss of the nutritional ingredients in the convenient instant purple potato food is lower, the guarantee period is long, the convenient instant purple potato food can be stored above 12 months at normal temperature, and the preservative is not used simultaneously, thereby meeting the requirements of people on green and healthy foods.

The invention provides a method of rapid seedling growing of true seeds of sweet potatoes. The true seeds are processed for 30 minutes by concentrated sulfuric acid, rinsed by clean water, directly sown in a base material, then covered by a mulching film for 3 days so that all seedlings can sprout, and then irrigated in a micro-jet manner so that seed coats can shed naturally. The micro-jet watering is performed in daily management so as to control the temperature and the humidity. According to the invention, seedling growing procedures are saved; large labor is reduced; and emergence time of the seedlings of sweet potatoes is increased. In addition, via the combination of the mulching film and the micro-jet irrigation, a problem of manual removing of seed coats after the true seedlings of sweet potatoes sprout is solved, labor is saved and percentage of seedling emergency of the true seedlings of sweet potatoes is greatly increased. Tests and statistics show that the average generation rate of the true seedlings of hybridized combination of sweet potatoes is more than 85%, survival rate of seedlings is more than 90% and requirements on planting, inserting and breeding of new varieties of the true seedlings of sweet potatoes can be completely satisfied.

The invention discloses a sweet potato distant hybridization breeding method with a high success rate, and relates to the technical field of plant innovation and new variety breeding of crops. The method comprises the following steps of: taking a wide-compatibility parental sweet potato Xushu 18 as a female parent, and regulating the flower season of the Xushu 18 to be synchronous with that of a wild specie sweet potato by a grafting and dark treatment method; performing water culture on a male parent and the female parent indoor to naturally take root and blossom; after the male parent and the female parent blossom, performing hybrid pollination; after pollinating, coating a hybridization treating fluid (40mg / L 6-benzyladenine, 45mg / L 2,4-dichlorphenoxyacetic acid and 40mg / L naphthylacetic acid) on the stem base of an ovary and the whole flower stalk, and continuously treating for 7 days; and for a combined hybridized ovule which stops early development, adopting immature embryo rescue technology. The hybridization method and a hybridization system of the invention have the advantages of high operability and high success rate. The method is also suitable for indoor directed hybridization of a field naturally blossoming sweet potato material and a conventional sexual hybridization breeding of the sweet potato.

The invention relates to a floating seedling raising method for sweet potato true seeds, and belongs to the technical field of sweet potato true seed seedling raising.The method specifically comprises the steps that 1, a floating seedling raising pond is built and filled with water; 2, 200-pore foam floating discs are selected and filled with a seedling raising matrix with the water content of 60%; 3, the germinated sweet potato true seeds which are treated through 98% concentrated sulfuric acid and subjected to hot water and agentia soaking treatment are selected to be seeded and covered with soil, the soil surface is leveled, and the seeds are put into the seedling raising pond to be cultured; 4, water is supplemented for once every about 15 days during culturing; 5, seeding raising fertilizer is applied for the first time 3-5 days after seedlings are neat, the application amount is 15 g / disc, the concentration of nitrogen is kept to be 300 mg / L, and top dressing is performed for once every 7 days; 6, the seedlings reach the strong seeding standard after the seeds are seeded for 30-40 days and can be transplanted together with the soil.According to the floating seedling raising technique, quick and neat seedling emergence of the seeds can be promoted, the seedling emergence rate can reach 100%, the seedlings can be neat after emerging for 3-4 days, growth of the true seedlings can be kept consistent, the seedlings are strong, the root systems are developed, the root-top ratio is high, the plant height is appropriate, and time and labor are saved in the whole process.

The invention discloses a comprehensive process for simultaneously preparing a series colorful purple sweet potato wine and a purple sweet potato pigment, which comprises the following steps of: selecting the purple sweet potato and sequentially carrying out cleaning, cooking, adding water and crude extracting, filtering, concentrating, column chromatography, membrane module concentrating, pH adjusting and spray drying to obtain the refined purple sweet potato pigment powder; sequentially fermenting, filtering and aging the residues such as filter residue in the above step to obtain the single color purple sweet potato wine; and adding the refined purple sweet potato pigment powder into the single color purple sweet potato wine to obtain the series colorful purple sweet potato wine through adjusting alcohol content, pH value and sugar degree and the like. The two product processes for producing the purple sweet potato pigment and the purple sweet potato wine can be integrated, so thatthe production efficiency is greatly improved, and the energy consumption is reduced.

The invention relates to a stem tip detoxification and cultivation method for a sweet potato virus seedling. The method comprises the following steps: (1) taking a sweet potato block infected by sweet potato feathery mottle virus and / or sweet potato G virus; cultivating the sweet potato block indoors to sprout; (2) shearing scissoring terminal buds growing to 1.5-2.0 cm for disinfection; (3) peeling off the stem tips with two leaf primordiums in a sterile manner among the terminal buds as explants for vaccination cultivation to obtain regeneration plants; (4) conducting 2-3 times of successive transfer cultivation on the regeneration plants obtained in the step (3) to build a strain; conducting inspection by adopting an indicator plant method and a cellulose nitrate membrane ELISA in sequence to obtain a detoxified strain; (5) proliferating the detoxified strain quickly to obtain the detoxification seedling. The method can quickly build cultivation system suitable for stem tip cultivation and rapid propagation detoxification seedlings of majority of sweet potato varieties / strains.

The invention provides a method for protecting seedlings of sweet potatoes for vegetable use in a winter greenhouse and marketing sweet potato seedlings in advance. The method comprises the following steps of: 1) transplanting cut field matured seedlings into the greenhouse in the last ten days of October; 2) carrying out alive seedling period management on survived sweet potato seedlings in about 20 days after transplanting; 3) additionally covering the greenhouse with a vegetable shedding film in November and carrying out shed management on the sweet potato seedlings, and in the last ten days of March in the next year, picking the sweet potato seedlings in the greenhouse and marketing the sweet potato seedlings and reserving the sweet potato seedlings for field reproduction; and 4) in the middle ten days of April, transplanting the reserved seedlings in the greenhouse to the field, carrying out film covering management after transplanting, and picking and marketing the sweet potato seedling tips in the last ten days of May. The method provided by the invention can be used for effectively overcoming the phenomenon of seedling shortage caused by coldness and high humidity, the sweet potato seedlings can live through the winter and can be stored, and emerge quickly in the early spring to grab market share so as to obtain high benefit.

The invention discloses fermented spiced black pickles and a preparation method thereof. The fermented spiced black pickles are characterized by being prepared by pickling, airing, re-pickling and fermenting 100 kilograms of radish or carrot or kohlrabi or tuber mustard head or Chinese artichoke or rutabaga or horseradish or alpinia japonica or sweet potato or dasheen or potato or yam or burdock or platycodon grandiflorum, 15 to 18 kilograms of salt, 0.2 to 0.3 kilogram of pepper, 0.2 to 0.25 kilogram of aniseed, 0.2 to 0.25 kilogram of cinnamon, 0.1 to 0.15 kilogram of fennel and 0.05 to 0.1 kilogram of clove. After pickling and natural fermentation, the cellulose and the organic ingredients of the product are transformed, so the nutritional quality of the product is improved, the product is fresh, fragrant and delicious, and the pickles are fine, smooth and easy to chew. The spiced black pickles prepared after fermentation can be stored for a long time, are not limited by the seasons of vegetables, can provide delicious dish to accompany a meal for people all year around, and enriches people's dining table. The product is simple in preparation process, low in price and suitable for ordinary people to eat, and can form a good market advantage.

The invention relates to a sweet potato bonsai preparation method comprising the steps of (1) sweet potato pretreatment, (2) germination acceleration, (3) bonsai cultivation substrate preparation, (4) potting, (5) modeling, and (6) bonsai management and maintenance. There is no chronological order restriction between the steps (2) and (3). With the method provided by the invention, a cultivation period is 6-7 months, and a yield is 55-65%. A viewing period can reach 5-7 months.

The invention relates to a method for raising seedlings out of sweet potato true seeds through nutritive bags and belongs to the technical field of seedling raising of the sweet potato true seeds.The method comprises the specific steps of 1, selecting the position of a seed bed; 2, placing the seeds into the nutritive bags, and densely arranging the nutritive bags; 3, selecting sprouting sweet potato true seeds subjected to pretreatment, hand-sowing the sprouting sweet potato true seeds into the nutritive bags, watering the sprouting sweet potato true seeds thoroughly, and covering the sprouting sweet potato true seeds with a thin film; 4, after the seedlings grow fully, removing the film at nightfall or on a cloudy day; 5, on the third to fifth day after the seedlings grow fully, applying a seedling raising fertilizer for the first time, wherein the nitrogen concentration is 300 mg / L, and applying the fertilizer another time seven days later; 6, on the 30 to 40 day after the seeds are sowed, in other words, the strong seedling standard is reached, conducting transplanting with soil.By means of the method for raising the seedlings out of the sweet potato true seeds through the nutritive bags, the germination rate reaches 92% or above, the emergence rate reaches 100%, the seedlings can grow fully in five days, the seedlings grow consistently, the root system is robust, quality of the raised seedlings is high, the adaptive capacity to an acquired environment is great, operation is simple, seedling raising time is flexible, at the later stage, it can be selected to culture the seedlings at site till the seedlings get mature, harvesting is conducted and furthermore the variety is subjected to breeding according to the conditions, the harvest yield of excellent strains is increased, and time for excellent variety breeding is shorted.

The invention discloses a production method of a sweet potato sprout, and belongs to the technical field of culture of seedling of crops. The production method comprises the steps of: (1) seeding potato seeds and culturing seedlings; (2) preparing a paper micro nutrition bowl; (3) cutting the seedlings and performing cottage; (4) rooting; and (5) binning, transporting and selling, etc. By adopting the production method of the sweet potato sprout, the seedling output per unit area is greatly increased, the quality of cutting seedlings is ensured, the effective seedling rate is up to 97 to 98%, the working intensity in culture of the seedlings and the cost of seedling are obviously reduced, the production efficiency is improved, and therefore the industrial production is realized; in addition, the sprout in the paper bowl has the advantages of being small in size, light in weight, convenient to transport, flexible in planting season and high in survival rate, and extending the shelf life to be up to 15 to 20 days. The production method of the sweet potato sprout can be popularized and applied in sweet potato production areas and seed and seedlings companies.

The invention discloses a method for breeding inbred line by using sweet potato special materials. The method comprises a special material selection and isolation method, manpower-assisted inbreeding and inbreeding offspring testcross selection. In the invention, a sweet potato special resource which blooms and fructifies naturally and has wide compatibility is taken as a parent material, a plurality of systems with different genetic backgrounds are established at the same time, the inbreeding is performed strictly and the hybridization is avoided by taking isolation measures; the character of blooming and fructifying naturally and the target economical character are successively selected, so as to breed a inbred line material which has excellent target characters and can bloom and fructify naturally stably in the north area in China, the testcross of the inbred line materials is used for identifying the heterosis and the excellent inbred line is used for crossbreeding.

The present invention relates to a purple sweet potato feed of microbial fermentation, which is made of the fermentation from the microbial mother liquor together with the inoculated purple sweet potato mixture; wherein the strains for the microbial mother liquor is 400 to 500 ml of starch solution bacillus, 100 to 200 ml of condensation bacillus, 300 to 400 ml of lactobacillus acidophilus, 10 to90 ml of Candida utilis; the purple sweet potato comprises 14 to 34 percent of purple sweet potato, 10.7 to 18.7 percent of chili powder, 10 to 18 percent of chrysanthemum pollen, 0.3 to 0.6 percentof sodium hydroxide, 0.7 to 1.0 percent of ammonium sulfate, 40 to 52 percent of water. Other plant wastes from which the pigment has been extracted are added into the remaining purple sweet potato from which the pigment also has been extracted, and through the microbial fermentation which is transformed into the feeds for pigs, chickens and geese, which improves the palatability of the feed, increases feed enzyme components and decreases the cost, which is of reasonable design, simple operation, convenient production, and is suitable for the broad farmers and breeding plants.

The invention discloses a factory culturing method for sweet potato seedlings with roots and tops. The method comprises the following steps of: establishing a culturing pool matrix, selecting seedlings, cutting seedlings, cutting, adding or pouring a nutrient fluid, and cutting the section seedling, and then the seedling with root and top is cultured. A support disc can be arranged on an agriculture film at the bottom of the culturing pool, the matrix is arranged on the surface of the support disc, and the nutrient fluid is arranged under the surface of the support disc. The nutrient liquid is prepared from the following components in percentage by weight: 48-52% of nitrate nitrogen three-element complex fertilizer, 25-30% of urea, 15-20% of potassium sulphate, 3-5% of potassium dihydrogen sulfate, and 1-3% of copper, zinc, manganese, magnesium, and molybdenum. The invention has the advantages that the culture period is short; the seeding has apical dominance and has roots including main root, side root and storing root; the root can continuously grow after being planted into fields, the drought resistance performance is strong, and the seedling return period does not exist; the growth in the field in the early period is strong, the sweet potato is early to form, the quantity of the formed sweet potatoes is much, and the yield of the sweet potatoes is high; the operating method is simple, and the integration cost is low.

Disclosed is a sweet potato and corn interplanting method. The method is implemented in late April every year and comprises the steps of (1) performing ridging after field tillage; (2) planting sweet potato plantlets at ridge tops, covering the roots of the sweet potato plantlets with soil of 5-8 cm to expose plantlet tips out of the soil for 3-5 cm, wherein the interval of the sweet potato plantlets is 18-25 cm; (3) planting corn in a mode of 2-3 seeds per hole, covering soil and enabling the interval between every two holes to be 25-30 cm. Tested by multiple experiments, the sweet potato and corn interplanting method can increase the net yield of corn by 50% under the condition of maintaining the yield of sweet potato, thereby increasing the income of grain for peasants and enhancing the economic benefits of dry lands. Further, according to the sweet potato and corn interplanting method, plantlet mulching is utilized to maintain moisture and temperature of breeding fields; restored nursery breeding is utilized to improve the emergency rate and to ensure orderly supply of the sweet potato plantlets, so that the labor intensity of the peasants can be reduced.

The invention relates to a method for brewing a purple sweet potato medlar dry red wine through combined fermentation of medlar and purple sweet potato. The invention belongs to the technical field of brewed wine processing. With the method, current defects such as weak wine body and light color caused by respective brewing of the two materials can be solved. Pigment content of wine brewed by using purple sweet potato can be high, but the wine body is weak. Pigment content of wine brewed by using medlar is relatively low, such that a true dry red wine cannot be obtained. According to the invention, the two materials with different production places and maturity stages are adopted. One of the materials is stored with a freezing or dying method, such that defects of the materials can be made up by each other. The two can be mixed according to a certain ratio, and a dry red wine can be brewed by fermentation. With the method, required sensory demands can be satisfied; more beneficial components in medlar fruits can be leached; product nutrition and flavor can be enriched; a health-care function can be enhanced; and a health-care beverage wine novel product with a unique flavor can be obtained. According to the invention, 1-50% of medlar and 51-99% of a purple sweet potato saccharified liquid are mixed and fermented, such that the purple sweet potato medlar dry red wine is brewed.

The invention belongs to the technical field of agricultural production, and particularly relates to a method for identifying the salt tolerance of sweet potatoes in the seedling stage. The method comprises the following steps: (1) salt stress treatment for sweet potatoes in the seedling stage; (2) physiological indicator detection for sweet potatoes in the seedling stage; (3) data analysis and salt tolerance division; (4) salt tolerance mathematical evaluation equation and salt tolerance index screening, namely stepwise regression analysis by using the salt tolerance comprehensive evaluationvalue D value as a dependent variable and the salt tolerance coefficient of each single index as an independent variable to establish a regression equation, and salt tolerance division according to the comprehensive salt tolerance D value. According to the method, the standard equation result is accurate and reliable, the operation is simple and convenient and is easy to grasp, the method is lessinfluenced by the outdoor environment, the condition is controllable, the comprehensive salt tolerance of sweet potatoes in the seedling stage can be overall reflected, and the result is reliable. Themethod can be used for quickly evaluating the salt tolerance of sweet potato varieties in the seedling stage, has small blindness and high efficiency, and provides germplasm materials to sweet potatosalt tolerance variety seedling and salty land development and utilization in the Yellow River Delta.

The invention provides a breeding method of group hybridization of sweet potatoes and belongs to the technical field of hybridization breeding. One type of sweet potatoes with a certain prominent property are prepared into a hybridization group and individuals with prominent properties are selected year by year, so as to realize gene polymerization; the individuals are used as a selfing line; thehybridization breeding between groups is carried out, so that hybrid seeds with good quality and properties are obtained. According to the breeding method provided by the invention, a gene is polymerized and the purposiveness is realized; meanwhile, a target variety can be obtained through 4 to 6 generations of reproduction. The breeding time is shortened and the breeding efficiency is improved.

The invention discloses a method for producing sweet potato buds by isolated culture of adventitious roots by sweet potatoes. The sweet potato buds can be conveniently obtained by the method of the invention, and can produce a great deal of sweet potato plants by asexual propagation. The method of the invention has significance to the regeneration culture of sweet potatoes, and opens up a new way for sweet potato detoxication and genetic transformation to avoid complex tissue culture process. In addition, the method of the invention has wide applicability, and is applicable to most of sweet potato varieties.