Select seeds.
Purple potato pieces in Chongqing are spun, like carrots, 5-6 pieces in a string. First, choose seeds. Chongqing purple, which is ready to breed, should be put on the ground for a few more days to let the potato pieces mature. After digging it out, it should be dried in the sun for two days to dry the seeds and kill the germs. There is no need to store them separately in strings to reduce the damage of potato chips. The cellar insulation technology is usually used to ensure the storage quality of potato seeds.
Timely seedling raising
In mid-February, when the temperature reaches 15 degrees, you can go out to raise seedlings. First make a seedbed, put the seeds horizontally on the seedbed with a row spacing of about 5cm, cover them with fine soil, spray them with a sprayer, cover them with plastic film, and cover them with a canopy to keep them moist and warm. When the new buds grow to more than 20 cm, they can be transplanted.
Plot selection
Purple sweet potato is a genus and species of potato. Because of the different growth habits and elements of purple sweet potato, choosing different soil will affect the product quality of purple sweet potato. It is best to use black, purple, sand and yellow mud, which is slightly higher and sunny. The location, quality and yield of purple sweet potato are very important.
Digging and ridging
Purple sweet potato is an underground tuber crop, which needs deep, loose and living soil environment. Spring sweet potato should be ploughed to 25-35 cm 15 days in advance, preferably with deep furrows and large ridges, so as to achieve intensive cultivation, with ridge spacing of 60-70 cm and ridge height of 25-30 cm.
Apply sufficient base fertilizer
Purple sweet potato is a high-yield and efficient crop, which needs a lot of fertilizer. In addition, ridge cultivation is not convenient for topdressing, and it is the most labor-saving to apply sufficient base fertilizer in fertile soil at one time. Generally, 40-50 tons of high-quality organic fertilizer and 35-50 kilograms of NPK compound fertilizer are applied per mu. All organic fertilizers are applied before ploughing, and compound fertilizer is used as the core fertilizer when ridging.
Timely early planting
Purple sweet potatoes are usually planted once a year. When the temperature is above 15 degrees, the earlier the cutting, the better. Generally speaking, sweet potatoes are harvested from late April to May in spring. It is better to insert sweet potatoes horizontally and obliquely. It is advisable to plant three nodes deeply, and there will be more tubers between nodes. It can be planted before the end of July at the latest, but it will affect the yield of purple sweet potato.
rational close planting
According to different soil fertility and characteristics, the reasonable cutting density is determined, and the spacing is generally 18-22cm. About 4000 purple potato seedlings are cut in fertile soil and about 4500 in thin soil.
Strengthen field management and timely intertillage weeding.
After ridging, while the soil is wet, apply herbicide once to prevent weeds from growing, and intertillage for 2-3 times. Combined with intertillage, purple potato is afraid of waterlogging and must be eliminated in time. When the drought is serious, it should be carried out in time if conditions permit.
pay in time
Turning purple sweet potato vines disturbs nutrient transportation, generally reducing yield by 30%, and can only be used to lift vines, loosen vines and nap. Don't disturb the direction when lifting the vine, put it back. Because purple sweet potato vines grow vigorously and there are many adventitious roots in internodes, ladder vines are the key to improve the yield of purple sweet potato.
Insect disease prevention
Purple potato has fewer pests and diseases, but it can't be sloppy. Underground pests include cutworms, red ants, trichlorfon, lime or other pesticides. The main pests in the field are stem borers and leaf rollers, and agricultural insurance killed them.
Health care method of purple sweet potato
How to eat purple potato in winter is the healthiest?
Purple potato is very popular in recent two years, not only because it has the nutrition and delicious taste of potatoes, but also because it has attractive purple and the health care function brought by purple.
The advantages of purple potato are: it can enhance immunity; Rich in vitamin B family, keeping skin elastic and preventing diseases; Rich dietary fiber helps to relieve constipation and lose weight; At the same time, the glycemic index and calories are much lower than those of rice, which is beneficial for diabetic patients to treat diabetes and lower blood sugar. Purple sweet potato adds a bright spot to potato, that is, anthocyanin, a super antioxidant, can prevent the harm of free radicals to human body and prevent human body from aging. Of course, this comes not only from the skin, but also from our brains and various organs of the body.
Everyone loves it so much, so I invite the following three nutrition experts to explain the benefits and secret recipe of purple potato.
Delicious purple sweet potato osmanthus porridge: Zhao Yingmin, a national senior nutritionist.
I have always liked purple potato, not only because of its sweetness and slimming effect, but also because it has the biggest advantage that other potatoes can't match: it has charming purple color and is a famous super antioxidant anthocyanin, which is very suitable for protecting my skin when I work in front of the computer every day.
My favorite dish is purple sweet potato and osmanthus porridge. Choose a purple potato, purple rice, tremella, a few red dates and a little osmanthus. The practice is also very simple. Wash the purple rice first, then soak it in cold water for 2 hours, remove the core from the red dates, peel and cut the purple potatoes into small pieces. Then pour the purple rice into the casserole, add water, and boil the swollen rice and purple potato over high fire. After boiling, turn down the heat until soft and cooked, add osmanthus and red dates and cook for 2 minutes.
This porridge looks very pleasing to the eye, with the sweetness of purple potato and the fragrance of osmanthus. It's delicious. Not only can beauty beauty, but also can stimulate appetite, moisten intestines, detoxify and lose weight. Best for this season, warm and sweet. It should be noted that purple potato and purple rice are natural pigments, and because anthocyanins are easily soluble in water, there is no need to worry about the strong purple color, and purple rice should not be washed too much, so as not to lose many of the most important components-anthocyanins.
Gu Zhongyi, a nutritionist in the Nutrition Department of Beijing Friendship Hospital, is a powerful nourishing purple potato tremella soup.
I don't know when more people order nutritious purple potato meals in hospitals. In fact, as for anthocyanins, eggplant, blueberries, grapes, purple corn and other blue-purple fruits and vegetables are all high in content. As far as dietary fiber is concerned, spinach and oats are both available, so they must not be deified. But to tell you the truth, I also like to eat purple potatoes. For urbanites who are seriously short of fruits and vegetables, it is much better to eat more purple potatoes than fried chicken legs. I recommend a purple potato and tremella soup.
It is really a wonderful thing to drink a bowl of hot purple potato tremella soup in the autumn morning, just the night before. Soak tremella, add water and simmer for 1 hour, then add purple potato, red dates, pear slices and rock sugar, simmer for half an hour and turn off the heat. Sticky and delicious.
Compared with white rice, this breakfast is very nutritious and reasonable. Tremella and purple potato are rich in carbohydrates, which will make you feel full, but the calories are very low. In order to increase vitamins, I added red dates. Tremella itself has the effect of moistening dryness. To enhance the effect, I also added pear slices. When drinking soup, if you don't feel too sweet, you can add some brown sugar to nourish blood and warm your body. Of course, you have to eat a boiled egg to supplement protein. It is more perfect to bring a fruit for breakfast when you go out.
Warm purple potato pumpkin syrup: Guo, an expert in sub-health clinic of Nanjing Hospital of Integrated Traditional Chinese and Western Medicine
Speaking of purple potatoes, I think of one thing. I went out two days ago and saw a long queue at the door of a small shop to buy drinks. I took a closer look and found that it was purple potato pumpkin syrup. The shopkeeper said it was a new product specially launched for Halloween. Have a taste. It is really delicious.
Pumpkin is the protagonist of Halloween every year, and now it is combined with purple potato. Pumpkin is not only an expert in iron supplementation, but also can prevent anemia and reduce the absorption of lead, especially suitable for women who often dye their hair and make up. The selenium content in purple sweet potato is very rich, and anthocyanins are very helpful to improve human resistance.