Basic knowledge of sweet potatoes, knowledge of chemistry in sweet potatoes

Sweet potatoes are also called sweet potatoes, and the soil is called red potato.

1. Analysis of the reasons for the reduction of sweet potato yield.

1. From April to July this year, it was relatively dry.

Sweet potato is a very soil-dependent crop, because its harvest object is the tuber, and the tuber root grows in the soil, and the formation and expansion of sweet potato tuber roots are deeply affected by the soil.

Most of the land on our side is loam, this soil is a mixture of mud and sand, whether it is water absorption or water retention, ventilation, etc., it is general, due to the continuous drought for more than 3 months, the sweet potato field is very dry, and the loam soil also begins to harden, the sweet potato tuber root growth in the soil is blocked, the shape will become not rounded, and the soil is dry, hard, not breathable, seriously hindering the expansion of sweet potato tuber, forming a firewood root, the firewood root is inedible, not as a harvest object, At the same time, the drought coincided with the growth period of sweet potato tubers, which led to the failure of sweet potato harvest and reduced yield.

2. Excessive nitrogen fertilizer in sweet potatoes leads to overgrowth.

Although there is a drought from April to July, there are some plots close to the pond on our side, and the use of pond water for irrigation can also ensure that the sweet potato field is not dry and hard, and can ensure the normal growth of sweet potatoes, but our daily improper fertilization will also lead to the failure of sweet potato harvest.

We all know that nitrogen fertilizer can promote the growth of leaves, in the case of excessive nitrogen fertilizer (such as long-term watering urine or urea), sweet potato leaves will grow very fast, the growth of a large number of leaves and vines will consume most of the nutrients, although the leaves can make a lot of carbohydrates through photosynthesis, but they can't catch up with internal consumption, which leads to sweet potato roots can not get enough nutrients**, or very small, or grow into firewood roots.

3. The high temperature causes sweet potatoes to not form tubers.

From April to July this year, the temperature in Beihai, Guangzhou, is high, and the general temperature is above 30 or even higher, in the case of such high temperatures, the vitality of the cambium layer of sweet potato roots is reduced, the lignification is serious, and it is difficult to form roots. When the sweet potatoes are past the peak season, the growth of the sweet potato tubers begins to slow down, resulting in a loss of harvest.

4. Neglect of management in the process of sweet potato growth.

The vines of sweet potatoes are spread along the ground, and there will be many nodes on the vines, in addition to growing leaves, under the right conditions, they will also grow roots, which are what we often call adventitious roots, which will intercept nutrients, thereby reducing the nutrients delivered to the main root system, and then slowing down the growth of sweet potato tubers.

1. The color of sweet potatoes is different, and the nutritional specialties are also different.

1. The carotene content in yellow sweet potatoes is higher, which is more beneficial to protect eyesight.

2. The dietary fiber content of white-hearted sweet potatoes is high, and the sugar content is 4% and 5% higher than that of yellow-hearted, and the taste is sweeter.

3. Purple sweet potato has high content of selenium and anthocyanins, and has a strong antioxidant effect.

Second, how to eat sweet potatoes.

1. Honey-roasted sweet potato.

Ingredients: 200g sweet potato, a little white sesame seeds, 50g rock sugar Method: Wash and peel the sweet potatoes and cut them into small pieces of 1cm square, and coat them with a little starch.

Put a little oil in the pan, add the sweet potatoes and fry slowly until the surface is browned.

Put rock sugar and a little water in a pot, boil until the rock sugar melts, wait for the sugar to color, and reduce the juice over high heat.

Pour in the fried sweet potatoes, shake the pan to evenly wrap the sweet potatoes with the sugar juice, turn off the heat and put on a plate, and sprinkle with sesame seeds.

2. Pull the sweet potato.

Ingredients: two sweet potatoes, appropriate amount of sugar, appropriate amount of oil.

Method: Cut the sweet potatoes into hob pieces, pour them into the oil pan and fry them until golden brown.

Take the fried sweet potatoes out of the pot and pour a little oil, add an appropriate amount of sugar, wait for the sugar to melt into syrup, pour the fried sweet potatoes in, and roll out of the pot.

It is also possible to boil syrup with water, but the sugar should be boiled over low heat, and it will be bitter when it is pasted.

3. Contraindications for sweet potatoes.

The taboo of eating sweet potatoes is that people who are prone to acid reflux should not eat at night, on an empty stomach, alone, and should eat hot food, and eat it with meat, beans, and vegetables;

It is not advisable to eat too much, otherwise it is easy to cause bloating, hiccups, farting, etc.

In addition, avoid eating sprouted sweet potatoes, which can easily cause food poisoning.

Sweet potato is a very common food in daily life, it belongs to one of the coarse grains, since it is coarse grains, sweet potatoes are very rich in dietary fiber, and these large amounts of dietary fiber can promote the peristalsis of the gastrointestinal tract, reduce the residence time of food in the gastrointestinal tract, and it can also absorb water to expand and soften the stool, so as to achieve the effect of moistening the intestines and preventing constipation.

In addition, sweet potatoes are also very rich in vitamins, and this kind of substances have strong antioxidant properties, which can remove free radicals in the human body, achieve the purpose of anti-aging, drive away facial pigmentation, and increase the elasticity of the body.

If you want to use sweet potatoes, you must control the amount of intake and cooperate with exercise.

The effect of sweet potatoes is mainly to replenish deficiency, invigorate qi, strengthen the spleen and stomach, and strengthen the kidney and yang.

Sweet potatoes can also be anti-aging, can inhibit the aging of the body, maintain the elasticity of the body and slow down the aging process of the body.

Sweet potatoes can also fight diabetes because sweet potatoes can increase the body's satiety and can also increase insulin sensitivity, which is beneficial for blood sugar control.

Because sweet potatoes have much fewer calories than rice, they won't make blood sugar too high because of eating sweet potatoes. Sweet potatoes can also reduce blood lipids and protect cardiovascular and cerebrovascular diseases, which can help prevent cardiovascular and cerebrovascular diseases.

Sweet potatoes also have anti-cancer effects because they contain nutrients such as carotene, which can stop the formation of cancer cells.

The long-stored sweet potatoes are sweeter than the freshly dug ones because the sweet potatoes contain amylase, which undergoes a reaction: starch is converted into maltose by amylase.

Sweet potatoes contain a lot of antioxidants, phytochemicals, including carotene, vitamins C and E, folic acid, calcium, copper, iron, and potassium. The fiber in sweet potatoes promotes a healthy digestive tract, and the antioxidants in them play a role in preventing heart disease and cancer. Eating whole grains regularly has great benefits for the body.

Sweet potatoes with brown or black spots on the skin are contaminated with the black spot fungus. The toxins excreted by the bacteria contain sweet potato ketones and sweet potato ketone alcohols, which will make sweet potatoes hard and bitter, which is harmful to the human liver.

Autumn and winter are the seasons when sweet potatoes are on the market, and sweet potatoes are divided into white hearts, red hearts and yellow hearts, what is the difference?

1.Red heart sweet potato.

The skin of the red heart sweet potato is red, and the sugar and water content are the highest among the three types of sweet potatoes, so after the red heart sweet potato is steamed, it will be glutinous and sweet to eat. Red sweet potatoes are suitable for roasting, steaming, boiling, and stewing, and generally northerners eat more.

2.Yellow-hearted sweet potato.

The skin of the yellow sweet potato is light yellow, and the sugar and water content are lower than that of the sweet potato and higher than that of the white sweet potato. The carotene contained in the yellow heart sweet potato is the highest among the three types of sweet potatoes.

3.White-hearted sweet potato.

The skin of the white-hearted sweet potato is light red, and the sugar and water content are the least among the three sweet potatoes, but it contains the most dietary fiber. If you like sweet potatoes and don't want to gain weight, try to eat white-hearted sweet potatoes.

Cheese Baked Sweet Potato:

Ingredients: 1 large sweet potato, 50g cheese.

Excipients: 50ml milk, 10g butter, a little sugar.

1. Main material. <>

2. Cut the sweet potato in half and steam it in a pot for 20 minutes.

3. Scoop out the sweet potato pulp with a spoon, leaving half a centimeter thick flesh near the skin.

4. Crush the dug sweet potatoes into a puree.

5. Add butter, sugar, milk and a little cheese and mix well.

6. Put it in the sweet potato shell and smooth it out.

7. Spread the cheese evenly.

8. Bake in a preheated oven at 200 degrees for about 15 minutes.

9. Wait until the cheese melts and changes color.

The correct way to eat sweet potatoes includes eating sweet potatoes raw, roasted sweet potatoes, steaming sweet potatoes, and so on.

1. Sweet potatoes are eaten raw.

Sweet potatoes can be eaten raw, wash the sweet potatoes directly, peel off the skin on the surface, and eat them directly, crispy and wide.

2. Bake sweet potatoes and eat them.

Sweet potatoes are the most common and sweetest way to eat them. As long as there is a roasted sweet potato, you can smell its aroma from far away. Roasted sweet potatoes sold outside are generally roasted in the oven, while the home version of roasted sweet potatoes is mainly divided into microwave version and oven version.

Sweet potatoes baked in the oven at home taste better.

3. Sweet potatoes are steamed and eaten.

Eating sweet potatoes steamed is also a relatively simple way to eat. Clean the sweet potatoes directly, put them in the pot and steam them. It is best not to steam the sweet potatoes while cooking rice, otherwise it may cause the rice to be half-cooked and can be steamed directly in the steamer.

If you cut it into pieces or slices and steam, it is easier to cook, but it tastes a little more watery.

Sweet potato purchase tips:

1. Look at the shape of the sweet potato.

Sweet potatoes come in two shapes, which are lean and slender and round and short. Among them, the thinner sweet potato is jokingly called "male sweet potato" among the folk, while the short and fat cautious kernel sweet potato is called "female sweet potato". The elongated shape of the "male sweet potato" is also very beautiful when cut off, mainly because the sugar content is much higher than that of the "female sweet potato".

The female sweet potato is relatively fat, so it is not suitable for baked sweet potatoes, otherwise it will appear that the appearance is cooked, and the inside is still raw. "Mother sweet potato" is more suitable for cutting into pieces and boiling sugar water.

2. Pinch it.

Although sweet potatoes need to be left for a while to be sweeter, they should not be left for too long, otherwise the water in the sweet potatoes will be lost. Dry sweet potatoes have no nutrition, and the taste will be worse when cooked. When you pinch the sweet potato, you will find that the head and tail of the sweet potato will be softer, which means that it is a sweet potato that has been left for too long.

3. Look at the epidermis.

Some sweet potatoes are left for too long, and the water is basically lost, and the skin of the sweet potato will be wrinkled. Sweet potatoes that have been left out for too long may spoil, so it is not recommended to buy them. Choose to buy sweet potatoes with smooth skin and no wrinkles, which are relatively fresh, rich in water and sugar, and will taste sweet and delicious when cooked.

The correct way to eat sweet potatoes is to eat them baked, steamed, boiled porridge, baked sweet potato cakes, and boiled sweet potato balls. The specific content is as follows:

1. Grill and eat.

This is a familiar way of eating, and there are many people selling it on the street. It's very fragrant and sweet, and it's very delicious.

2. Eat steamed.

This method is very simple, as long as the sweet potatoes are washed and put in the pot to be steamed, they can be eaten, and they will be powdery to eat, which is very suitable for children to eat.

3. Cook porridge and eat.

After washing and peeling the sweet potatoes, chop them into small pieces and put them in a pot to cook porridge, which is very nourishing and stomach-friendly, and is very popular with the elderly.

4. Brown sweet potato cakes.

Wash the sweet potatoes, peel them, put them in a pot and cook them, then mix them with flour, make them into small cakes, and fry them in an oil pan, which is very sweet and delicious, but it is too greasy and not suitable for eating more.

5. Sweet potato balls.

Peel the sweet potatoes and cook them in a pot, then puree, add an appropriate amount of glutinous rice flour, knead them into small circles by hand, and then fry them in an oil pan to turn golden brown.

Summary. Peel and slice the sweet potatoes and steam them in a pot for 20 minutes Step 2 120g milk + 20g brown sugar + 110g glutinous rice flour, mix and stir well.

Peel and slice the sweet potatoes and steam them in a pot for 20 minutes Step 2 120g milk + 20g brown sugar + 110g glutinous rice flour, mix and stir well.

Eat sweet potatoes in moderation according to your preference. It is recommended not to consume more than 500g a day to avoid causing abdominal discomfort.

1.Sweet potato porridge: Mix rice and glutinous rice into a casserole, add water, bring to a boil over high heat, then turn to the lowest heat and cook.

When the rice is slightly cooked, add the sweet potato and simmer for about 20 minutes. Noisy Hall 2Pull out the round silk sweet potato:

Pour the sugar and water into the pot, boil the sugar over high heat, pour in the fried sweet potatoes, stir evenly, and sprinkle sesame seeds before leaving the pot. Ascend to the Hidden Calendar.