I come from Fengyang, Anhui. I don't know where I can grow purple potatoes. I just want to ask, do planting techniques and temperatures require plastic greenhouses?

Planting techniques of purple sweet potato

In recent 20 years, more and more foreign research results show that sweet potato is rich in nutritional value. Sweet potato is rich in 18 amino acids, the dietary fiber content is 10 times that of rice and flour, and vitamin E is 9.5 times that of wheat. It is a physiological alkaline food, which maintains the acid-base balance needed by human health. Selenium-enriched purple sweet potato is a new sweet potato variety introduced from pinghu city Academy of Agricultural Sciences. After the successful trial planting in 2007, it was tested by the Agricultural Products Quality and Safety Supervision, Inspection and Testing Center (Zhejiang) of the Ministry of Agriculture. The organic selenium content per kilogram of fresh potato is above 0.0 1 mg, and the anthocyanin content per kilogram of fresh potato is 200 mg. Regular consumption can improve immunity, lower blood pressure and protect the liver.

I. Biological characteristics

Purple sweet potato likes warm climate. The suitable growth temperature of stems and leaves is 18 ~ 25℃, and the growth stops below 15℃. The optimum ground temperature for the growth of tuberous roots is 22 ~ 24℃, and when the ground temperature is lower than 20℃, the tuberous roots stop expanding. Purple sweet potato is a short-day crop, which needs sufficient light and high intensity. The suitable soil moisture for purple sweet potato growth is 60% ~ 80% of the maximum water capacity in the field.

Second, the cultivation technical measures

1. Variety Selection Purple sweet potato originated in Japan with the scientific name Chuanshanzi, which was successfully selected by Japanese researchers in the late 1990s. China began to introduce purple sweet potato in 2002, and now there are many varieties cultivated in China, some of which are natural pigments, which are not suitable for fresh food, with high starch content, low moisture and dry taste, and are more suitable for extracting pigments, processing whole powder and processing snack foods. There is a selenium-rich purple sweet potato named "Yu Zi 263", which is a new variety of selenium-rich purple sweet potato. Its skin is purple, the meat is purple and delicate, it is full of water, sweet but not dry, and it tastes sweet and waxy. It is an ideal coarse grain choice for people and is more suitable for fresh food. The most important thing is that it is rich in selenium, a trace element beneficial to human body. 2. Selective fertilization Se-enriched purple sweet potato is suitable for planting in paddy fields with high terrain and convenient irrigation and drainage. A single row of small ridges with a width of 40 cm and a height of 25 cm was used for deep ridge cultivation. Fertilization should master the principles of increasing base fertilizer, applying potash fertilizer and supplementing phosphate fertilizer. The base fertilizer is mainly bio-organic fertilizer, with a yield of 300 kg per mu, and a proper amount of compound fertilizer,15-15, is applied in a strip. Top dressing should be based on decomposed human feces. 3. Timely and early planting: Se-enriched purple sweet potatoes are generally planted once a year. When the field temperature is stable above 15℃, the sooner the better. Generally, spring potatoes should be cut in mid-May. It can also be planted before the end of July at the latest, but it will affect the yield of selenium-rich purple sweet potato.

Third, improve the quality of planting, reasonable close planting.

Select disease-free vine-head seedlings, divide them into large and small seedlings, bury three leaves for planting, and insert the seedlings obliquely in the border. Potato seedlings are 20 cm long, with 3 nodes obliquely inserted into the soil and 2 nodes exposed from the soil surface. After cutting, use decomposed human excrement and urine as topdressing to ensure the living trees. Water frequently after cutting to keep the soil moist. According to different soil fertility and characteristics, the reasonable cutting density is determined, the plant spacing is generally 25 cm, the row spacing is 75cm, and there are about 3500 purple sweet potato seedlings per mu. Flat border planting. 4. Strengthen field management and prevent grubs before planting (1). Iron frog (3% phoxim granules) can be used for control, and the dosage per mu is 6 kg, and the middle of each ridge is ditched, preferably in the evening. (2) Immediately after planting, chemical weeding is carried out with acetochlor at a dosage of 150 times per mu, and 3 barrels of water are added for weeding, and seedlings are checked and replenished 3-5 days after planting to ensure the whole seedlings. (3) timely intertillage and soil cultivation in the early growth stage, generally 2-3 times, combined with intertillage and soil cultivation to help ridge; Selenium-rich purple sweet potato is most afraid of waterlogging, so it must be eliminated in time. When the drought is severe, it is necessary to fight drought in time if conditions permit. Pull up the grass after closing the ridge. (4) Do not turn over the vines, protect the stems and leaves, and lift the vines. Because the stem and leaf of sweet potato are damaged, it produces less nutrients, and at the same time, it will also cause the leaves to turn over, overlap and be dense, which will damage the top of the seedlings, promote the axillary buds to produce new branches and leaflets, and reduce the photosynthetic efficiency, generally reducing the yield 10% ~ 20%. In order to protect the stems and leaves of sweet potatoes and promote root swelling, it is generally unnecessary to turn vines except weeding in the early stage. In rainy season, adventitious roots tend to grow on potato vines and disperse nutrients. Therefore, it is necessary to gently lift the vines and put them back in place to achieve the purpose of inhibiting the growth of adventitious roots and concentrating the nutrition of potato pieces. When lifting the vine, you should prevent the sweet potato vine from breaking and stepping on it. (5) timely control aphids, sweet potato leaf rollers, Spodoptera litura and other pests. It was found that aphids could be sprayed with 10% imidacloprid 1500 times solution. It was found that 48% Roxben EC was used to control sweet potato leaf roller and scarab, and 0.5% emamectin benzoate (common name: emamectin benzoate)1500-2,000 times solution or 3,000 times solution (5ml) of DuPont Anda was used to kill Spodoptera litura. (6) Promote the expansion of potato chips. By the middle and late September, the temperature began to drop and the root absorption capacity was poor. At this time, sweet potatoes need potassium fertilizer most. Foliar spraying is the main way to supplement potassium, and 75kg of 0.3% potassium dihydrogen phosphate aqueous solution or 7% plant ash leaching solution 150kg is applied per mu. (7) There is disastrous weather in September and June, 65438+ 10, so it is necessary to do a good job in flood control and drought relief. Selenium-rich purple sweet potato can be stored for long-distance transportation and is a potential product in fresh agricultural products. The introduction of Se-enriched purple sweet potato has positive significance for adjusting the agricultural industrial structure of our city, cultivating characteristic industries, achieving agricultural efficiency and increasing farmers' income, and has certain social benefits for enriching the agricultural product market and providing high-quality, safe and healthy agricultural products.

It's in Baidu Purple Potato Encyclopedia. You can also have a look.