The mini sweet potato refers to sweet potatoes that are 50 to 150 grams in size and have a fine texture and rich flavor. Mini-sweet potato is suitable for microwave baking or whole cooking in small modern families. It can be eaten with coarse and fine grains. The price of supermarkets in Hangzhou and Shanghai is 4 times higher than that of ordinary sweet potatoes. It is loved by consumers and its planting area is rapidly rising. 1. Environment selection Choose planting areas in accordance with pollution-free food ---- environmental conditions of vegetable production environment. At the same time, the soil is required to be loosened with new red, yellow or sandy paddy fields, and the soil is acidic. 2. Variety selection 2.1 Jinyu (formerly Zhejiang 1257). Zhejiang Academy of Agricultural Sciences, bred, pink skin color, pure yellow flesh, short round potato pieces, smooth skin, taste powder, sweet, crunchy, delicate texture, there is no crude fiber (ribs), fragrant flavor, drying rate of 30% - -32%, single tuber 5-7 pieces, tuber size uniform, good precocity, 110d (days) or so can be harvested, suitable for planting in different seasons, commodity potato rate can reach 85%, below 50g small sweet potato Also do not have characteristics, suitable for hotel, hotel consumption. This species has good seedling emergence and drought tolerance. The main drawback is susceptible mulberry disease. Effective measures for disease avoidance include selection of disease-free seed potatoes, high-cut seedlings, and avoidance of continuous cropping. 2.2 Good condition (formerly known as AIS). Introduced foreign varieties. Skin color golden, red flesh, round potato, smooth skin, taste soft, sweet, crunchy, excellent quality, fragrant flavor; drying rate of 25% --26%, suitable for cooking or baking, single knot 5-6 potatoes, uniform size potato. Good emergence, medium maturity, growth period of 130d (days) or so. 2.3 Heart fragrance. Zhejiang Academy of Agricultural Sciences, breeding new varieties. Purple red skin, potato oval, smooth skin, taste more powder, fine texture, sweet, drying rate of 27% -29%. The underground potato is shallow and concentrated. It is suitable for mechanized harvesting. The number of tubers per plant is 6-7, and the size of the tubers is uniform. The variety has good precocity and high yield. It is covered with mulching in late April-early May, and can be harvested for 90 days (days). The yield and ripeness are comparable to the high-yielding variety Sushu 8, which can be planted in Zhejiang for one year. season. 2.4 Zhejiang potato 6025. Purple red orange flesh, potato wedges oval, smooth skin, just harvest, taste powder, after storage (November), the starch continues to degrade; taste softer, crunchy, sweet, good flavor, starting in November to supply the market Better, with a small amount of crude fiber at both ends, the drying rate is 28%--32%. The number of tubers per plant is 5-7, and the seedlings are good. The upper part of the plant is erect and grows vigorously. The leaf color is dark green, medium vine, medium maturity, and the growth period is more than 120 days (days). The planting is better in mid-June. 2.5 Zhejiang potato 78. Red-skin and orange flesh, round tuber, smooth skin, soft, sweet and chewy texture, small amount of crude fiber on both ends, good flavor, drying rate 25%--26%, good precocity, suitable for early planting Close, the harvest after October is of inferior quality. 3, nursery early maturing varieties should adopt greenhouse + small shed + plastic film three-layer insulation seedlings, after the emergence of mulching with plastic film coverage, early supply of the market; conventional cultivation can be used small greenhouse + plastic film two-layer nursery. Seedbed width 1.0m, depth 15 - 20cm, bed layer of organic fertilizer after a watering cover soil. The selection of seed potatoes requires the typical characteristics of this species, no pests and diseases, and 100--250g of potato chips. The seed density is about 3cm apart from the tubers, and the tubers are lined after the row of seeded plants is good. The thickness is 2 to 3cm and cannot exceed 5cm so as not to affect the seedling emergence. When 60% of the tubers sprouted, the mulch was removed. When the temperature is above 20°C on sunny days, open the ventilation membrane at both ends of the arch membrane and the greenhouse membrane to prevent burning at high temperature, keep the bed temperature at 25--30°C, and use the humidity of the bed to see dryness and moisture. When the potato shoots are 20-25 cm long and there are 6-8 intact leaves, they can cut seedlings and plant the fields. 4. The site preparation and fertilization site preparation should be carried out on a sunny day, and the soil should be broken and made fine. After flattening, the fertilizer strips were applied to the ridge bottom with a ridge distance of 80cm and a ridge height of about 20cm. Fertilizer can use special organic compound fertilizer. When the planting area is large, it is required to determine soil N, P, K and organic matter. In the south, soil pH value and soil fertility level should be 40-60 mg/kg (upper right-1). Fast-acting phosphorus 20mg?kg(upper right-1), available potassium 100mg/kg(upper right-1), organic matter 1%, pH5.0--6.5, according to soil fertility level and sweet potato need fertilizer characteristics, preparation of N, P, K With organic fertilizers, ordinary compound fertilizers are not recommended. 5. When the average temperature is above 10°C, seedlings can be planted in Daejeon. Since the temperature in the early stage is relatively low (late April - mid-May), mulching can be used for cultivation. When planting, the four nodes are horizontally inserted or obliquely inserted into the soil. When the drought occurs, the two leaves are exposed on the ground and the rest of the leaves are buried in the soil so as to facilitate the survival of the potato seedlings and the uniform dispersion of the potato, increase the commodity rate and yield, and increase the planting density. 4000 strains (667 square meters) (upper right-1), 20 cm spacing. 6, field management sweet potato disease mainly black spot, soft rot; underground pests are mainly crickets, golden worms. Choosing a loose new red, yellow soil or applying a paddy crop rotation can effectively avoid diseases and underground pests. The main pests on the ground are Spodoptera litura and sweet potato moth, which are infested from July to September. In the 1- to 2-year-old stage of pests, they are sprayed with 5% Supiophos or 5% Cascade 1000--1500 times to control. After planting, acetochlor was used for chemical weeding; during the mid-growth period of sweet potato, artificial weeding was performed 1--2 times, and it was not necessary to turn rattan. 7. There is no obvious maturity period for harvesting sweet potatoes. Determine the harvest time by field sampling. Continuously dig 10 plants and measure the yield and commodity potato rate. When the commodity rate reaches 65% - 70%, it can be harvested. Xinxiang can be harvested 90 days after planting (days). The earliest harvest period is in late July. The harvest period can be determined according to local climate characteristics and market demand. Finished before the frostfall. It should be noted that it is not possible to harvest sweet potatoes on rainy days to prevent them from having more dirt and affect the appearance of the products. During harvest, they should be dug lightly, lightly loaded, lightly transported, and gently unloaded to prevent the damage to the peels and shucks of potatoes and potatoes. And storage. If the temperature reaches 32°C during the harvest, sweet potatoes should be sent to the house within 2 hours (hours) to avoid skin burns, affecting the appearance and storage stability. 8. Transportation and storage are transported into warehouses using plastic turnover boxes. Short-distance transportation should prevent the sun, rain, long-distance transportation to freeze insulation or cooling. Sweet potato optimum storage temperature 10-15 °C, relative humidity 85% - 90%, pay attention to prevent frostbite and reduce water evaporation, pay attention to ventilation and heat, to prevent toxic and hazardous substances, prevent extrusion damage. China Agricultural Network Editor