Extended information
Nutritional value
Sweet potato root contains 60%-80% water, 10%-30% starch, about 5% sugar and a small amount of protein, oil, cellulose, hemicellulose, pectin, ash, etc., if 2.5Kg of fresh sweet potatoes converted into 0.5Kg grain calculation. Its nutrients in addition to fat, protein, carbohydrates and other content than rice, flour high;
And sweet potato protein composition is more reasonable, essential amino acid content is high, especially grain and cereal foods in the lack of lysine in the sweet potato in the content is high. In addition sweet potato is rich in vitamins (carotene, vitamin A, B, C, E), and its starch is also easily absorbed by the body.
1, carotene
Vitamin A has been known as "eye protection little guardian", vitamin A is transformed from carotene. Sweet potato is rich in carotene, can provide rich vitamin A, vitamin A content can be as high as 40mg/100g fresh white groundnut, carotene is absorbed by the human body, can be converted into vitamin A. Vitamin A can maintain normal visual function.
2, edible fiber
White groundnut contains fiber equivalent to 10 times the rice flour, its texture is delicate, does not hurt the intestines, can accelerate peristalsis in the digestive tract, help defecation, clean up the digestive tract, shorten the retention time of toxic substances in food in the intestinal tract;
Reduce the human body due to constipation caused by its own toxicity, reduce the concentration of intestinal carcinogens, prevention of hemorrhoids and colorectal cancer. At the same time fiber can absorb part of the glucose, so that the blood contains less sugar, help prevent diabetes.
3, sugar and protein binding substances
White groundnut is rich in mucin, which is a mixture of polysaccharide and protein, the human body has a special protective effect, can maintain the digestive tract, respiratory tract, joint cavities, membrane cavities lubrication and vascular elasticity;
Because of this substance prevents substances in the arterial wall of arteries and arteriosclerosis, can prevent Liver and kidneys and other organs of connective tissue atrophy, can slow down the aging of human organs, improve muscle immunity. White groundnut also contains glycoproteins, has a very good anti-mutagenic, lipid-lowering and immunity-enhancing effects.
4, potassium
White groundnut is high in potassium, which can alleviate the disadvantages brought about by excessive intake of salt. Potassium is also an important factor in protecting the heart. As potassium is an alkaline element, white groundnut has a pH value of 10.31, which is physiologically alkaline food and has the effect of neutralizing body fluids. Appropriate consumption of white groundnut is conducive to maintaining the acid-base balance of blood, which is beneficial to people's health, development and intellectual development.
Sweet potato is rich in protein, starch, pectin, cellulose, amino acids, vitamins and a variety of minerals, "longevity food" reputation. Sugar content of 15-20%. There are anti-cancer, heart protection, prevention of emphysema, diabetes, weight loss and other effects. Ming Dynasty Li Shizhen "Compendium of Materia Medica" recorded that "sweet potatoes fill the deficiency, strengthen the spleen and stomach, strong kidney yin", and said that the people in the sea to eat the longevity. Chinese medicine regard sweet potato as a good medicine.
Storage and preservation
Sweet potatoes need to be dug out of the ground before the onset of frost, digging as much as possible not to damage its skin, stored in the cellar dug beforehand, the soil around the cellar to the yellow soil is good, the depth of 3 to 5 meters. The sweet potatoes in the cellar neatly arranged, and finally sprinkled with some preservatives, the cellar mouth with a pile of grass to cover.
One, after the spring temperature rise, in the windless sunny warm weather at noon, the temperature exceeds 12 ℃, a short period of time to the potato cellar ventilation, can reduce the concentration of fungi in the cellar, to prevent the cellar humidity is too large, caused by the potato skin damage to mold, affecting the appearance of the quality of goods.
Two, the cellar temperature is often maintained 11-13 ℃, relative humidity 85 ~ 90%. If the cellar temperature exceeds 15 ℃, open the vent properly to release the temperature.
But it should be noted that the spring temperature is often very unstable, some years to April there will be snow and cold weather. Especially on the poor insulation performance of the potato cellar must not be paralyzed, once the cellar temperature drop, immediately cover the vents for insulation, if necessary, the use of heating facilities appropriate heating.
Three, cellar humidity hours, should be added to the cellar pit water or wet grass curtains paved walkway, increase the humidity of the air in the cellar.
Four, found in the cellar sweet potato disease bad spreading tendency, should be taken out immediately as soon as possible to eat, in order to reduce the loss of disease rot.
Fifth, spring sweet potato nursery take seed potatoes after the end of the preparation for the extension of preservation, should pay attention to strengthen the management of temperature and humidity is the highest cellar temperature does not exceed 15 ℃, the relative humidity control in 65 ~ 90%. After the weather becomes hot, but also pay attention to the cellar ventilation.
For a long time sealed too tight and potato pieces of a large number of rotting potato cellar, into the cellar before the vent should be opened in advance for ventilation, to confirm the safety of the cellar, so as not to cause oxygen deprivation and asphyxiation.
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