Shulou(Shulou.com)11/24 Report--

The highest yield of super hybrid rice studied by Yuan Longping and other agricultural experts can barely exceed 2000 jin per mu, while the average yield of sweet potatoes planted by human beings can reach 6000 jin to 8000 jin per mu. Rice, corn and wheat are recognized as the three staple grains in the world, among which the average yield per mu of corn and wheat has been more than 2000 jin.

Food is the most important thing for the people, and only by growing higher yields of food on limited land can we solve the problem of food and clothing for all people in the world, but so far there are still many people in the world who do not have enough to eat, especially in the African region. some people in extreme poverty still suffer from hunger and malnutrition for a long time.

The yield of sweet potato is so high that it is several times higher than the other three staple grains, just like corn and wheat, which can be planted on dry land. In addition, sweet potato tastes and tastes good and can be eaten raw. It is an important food crop to solve the problem of food and clothing during famine.

Tuyuan Pixabay, then why didn't sweet potato become the staple food? Sweet potato used to be called sweet potato, which is also called sweet potato or red potato in some areas. the sweet potato powder sold in some supermarkets is sweet potato powder, and dried sweet potatoes are also made from sweet potatoes. In addition, sweet potato starch can also be made into by-products such as sweet potato noodles.

Sweet potato originated in America. After Columbus discovered the New World of America, it spread to the whole world through Europe. Sweet potato was introduced into China in the middle and late Ming Dynasty, ten years of Wanli (1582). Chen Yi introduced sweet potato from Annan (now Vietnam). He was the first person to introduce sweet potato in China, but it was not popularized. More than a decade later, Chen Zhenlong, a native of Fujian, brought back sweet potato seeds from Luzon (Philippines) and submitted a letter to the government to promote planting.

Although these ancestors were sweet potato seeds secretly brought back, their behavior was great, because their efforts alleviated the famine at the end of the Ming Dynasty to a certain extent, and saved many people from starvation in the years that followed.

As we all know, if you eat too many sweet potatoes, your stomach is prone to flatulence and indigestion, because the fiber in sweet potatoes is much higher than the other three staple grains, which is not easily digested by stomach acid and produces gas, which must be discharged.

Wheat, corn and rice will become staple foods, which are the choices made by human beings in the process of long-term development, and they are not as high in fiber as sweet potatoes and are easier to digest and absorb. The reason why sweet potato is high in cellulose is that it is not a seed but a tuber. In addition, the protein content of sweet potato is not as high as that of the other three staple grains and potatoes.

If you eat too much, it is not easy to digest. Is it really the reason why sweet potatoes cannot become staple foods? In fact, there is a more important reason, that is, sweet potatoes are not easy to be stored for a long time, which should be the main reason that hinders sweet potatoes from becoming a staple food.

If the temperature is too low, the sweet potato will freeze and spoil and will not be able to eat. In order to solve this problem, sweet potatoes are stored in cellars or caves for the winter in some areas, and the holes specially dug for this purpose are also called "Tiaodong". But even so, it's hard to keep sweet potatoes for more than a year.

Compared with Pixabay, wheat, corn and rice become very low in moisture content after drying in the hot sun, so they are easy to store. If stored properly in a dry environment, it is difficult to mildew and deteriorate after two or three years, and it does not affect food consumption.

Since sweet potatoes are not easy to store, why not dry them? To tell you the truth, to dry sweet potatoes, you must cut them into small flakes or lumps, or it will be difficult to dry them completely even in seven hot suns. However, after drying, the taste will also get worse.

It is not easy to store sweet potatoes for a long time, which means that it is difficult for people to tide over the difficulties in drought and other famine years.

From a historical point of view, sweet potato does exist as a staple food in China for a long time, but now people have a higher pursuit. Compared with rice, wheat and corn, it is difficult to play tricks on the diet, especially wheat flour can make a variety of delicious pasta, sweet potato is not. Sweet potato naturally fell from the status of staple food, became the same existence as potatoes, and became a non-staple food.

In China, rice and wheat are the main staple grains, of which rice is produced in the south and wheat in the north. As for corn and sweet potatoes, not many people eat them, and they are mainly used to feed pigs and other poultry and livestock.

This article comes from the official account of Wechat: scientific exploratory bacteria (ID:kxtsj9405). Author: Nansha startled Dream.

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