History，Sweet potato has written a strong stroke，From the disaster relief helper、Reclamation Pioneer、Poor people often grain、Animal feed to the current healthy food、Chemical raw materials，Sweet potatoes with multiple noodles play different roles in different time and space，Specific and slightly present the epitome of global history，Records the deep vertical surface of Chinese history。

Although China today is stable in the world's largest sweet potato producer，However, the production of sweet potatoes continues to decline，The proportion of sweet potatoes in rations can almost ignore，Consumption of sweet potatoes is also less in total sweet potato yield，Sweet potato is a veritable non -renewal、miscellaneous grains。The history of sweet potatoes，We can know that their characters have changed multiple times，Maybe you can focus on the sweet potato，Digging its potential for sustainable development。

　　The introduction and promotion of sweet potatoes in China

Sweet potato originated in the Americas，The production environment in the Americas created sweet potatoes, warm and humid、The characteristics of barren resistance，This is the attribute of land rather than artificially given sweet potatoes。Sweet potatoes become common crops in the Americas，But was excluded in the "Three Sisters Crops" bet365 Play online games (corn、Cai Beans、Pumpkin) outside，By the hands of the colonists，The first to reach Spain on the old continent，and then spread to the entire old continent，The source of new food shared by humans。

The significance of sweet potatoes is not only to enrich food types，Provides more choices for agricultural production，Then change the planting structure、Economic form and even ecological environment，More in different ethnic groups、Country、communication and internalization between culture，This is the initial globalization、The most important communication -material cultural exchange。And，Since the old continent accepts sweet potato itself，I don’t know the native culture of sweet potatoes，The introduction of new varieties and localization are undoubtedly another new culture creation process，Involved in the economy、Technology、Culture、Society and other aspects。People often confuse sweet potatoes with ancient "potato"，The literal meaning of the foreign body of the same name is just the reason for the surface，Deep -level reasons are to graft sweet potatoes、Integrated into Chinese local culture。

During the Wanli years，Sweet potato is introduced into Fujian，Some people think that Chen Zhenlong Gong is more than Shennong，Not too exaggerated。Except Chen Zhenlong's Philippines -Fujian Changle route，Legend of eight routes still exists，But we thought that most of the three people became tiger's accumulation construction，bet365 best casino games can be falsified。Of course，There are indeed important characters in the history of sweet potato communication，The existing emperor will be phased、power bureaucrat，There are local governments、Merchant group and ordinary scholars。Compared with corn，Sweet potato promotion resistance is smaller。

Expressing over time，The image of sweet potatoes has also undergone the transformation from "Yangchun White Snow" to "Xialiba"，The turning point can be said to be the "meet" of sweet potatoes，shows its strong vitality- "Thirteen Sweet Potato Wins"，Following the footsteps of immigrants continuously expand。in the mountainous area，Sweet potatoes jumped from ordinary crops to rescue crops，Then to the main miscellaneous grains，Finally became the main rations，Multiple transitions in their characters，This is species and environment、People、The results of multiple factors such as social and other factors。

Inner logic of the development of sweet potato

Due to the introduction of sweet potatoes，Land that is difficult to grow crops、The land and seasons of waste cultivation can be activated，Then drive the increase in total grain output，supports the growth of the existing population，Not only does it promote crop reorganization，It also provides a new foundation for changes in crop planting system。Although from the final result,，Sweet potato is extremely important，But this process is long，Not happened overnight。From the mid -18th century bet365 live casino games to the mid -19th century，It is the fastest stage of sweet potatoes in the southern mountainous area，As a major food crop, it has played a huge function，There are not many achievements in the southern plain area，Finally formed the southeast hills of sweet potato planting bands。Sweet potato promotion in the north should be later，Only in the late Qing Dynasty and the Republic of China will not have great development，However, there is still no status in the southern mountainous area。

This situation appears，The reason is that sweet potatoes have not been grain crops for a long time，but only as rescue crops，So the phenomenon of "led and not planted" and "after disaster"。Among them, there are both Huayi representatives、Planting system、Technical atresia and other main factors restrictions，There are also Tibetan species technology、Sweet Potato Save、Taste physiology and other important factors restrictions。The status and role of sweet potatoes before the founding of New China are very limited，But it has nothing to do with the "Big Bang" of the Ming and Qing Dynasties，Therefore, you need to criticize the "American crop decision theory"，Fairly face the influence of sweet potatoes。The real role of sweet potatoes is measures to actively cope with population pressure，"Population pressure determines food production"。

Sweet potatoes gradually become China's pivotal field crops，Through crop combination and land use，Space pattern affecting agricultural production，Bet365 lotto review Enter the daily life of the people。"Sweet Potato Grain Grain" records are all，Even the folk belief related to sweet potato was born、Agricultural Shalang Poems、Dietary Culture、Name Culture and other views。

　　The historical status of contemporary sweet potato

Since the founding of New China since the 20th century，Government power provides good political guarantee for the planting of sweet potatoes，Folk forces provide it with economic vitality，In the interaction between the two，Sweet potatoes finally joined the country's tax and warehousing system from "escaping crops"，Become "National Crops"，Finally became my country second only to rice、Mai、corn，Grain crops in the fourth place，This transition has created the psychological identity and emotional conversion of several generations。Since the reform and opening up，The role of sweet potato changes again，From main grain to miscellaneous grains，Although the output is surging，But the proportion of rations is declining，Among them, the inner logic of feed。Compared with corn that is also a crop of America，Insufficient innovation of sweet potato technology is its important shortcomings，Of course, this does not prevent the birth of sweet potato geographic logo。

In recent years，Chinese sweet potato planting has weakened a lot compared to the peak of history (the intercourse of the century)，Fast、A large reduction of planting，Rural labor reduction after transition with society、Sweet potato cultivation bet365 Play online games process is relatively complicated，and as factors such as the replacement of cheap corn as feed and soybean，But the most important thing is the reduction of planting income，Leading the planting willingness of farmers is low。As for the reduction of income? Sweet potatoes are no longer provided for normal grains and feed is the main reason，This is completely opposite to corn。Sweet potato has been converted to supply food processing raw materials in most origin，This is a common trend，The statistics of the National Bureau of Statistics have long been classified as "potato"，No longer specifically counting the production indicators of sweet potatoes。but，Sweet potato still occupies an important position in crops。and the sweet potato "fame up" again，I am afraid that it will be classified as the shape of external forces such as "anti -cancer stars"。

In short，Historically, sweet potatoes from plains to mountains to plains，From the frontier to the south to the north，From miscellaneous grains to main grain to feed，Consortium、Diverse processing products before industrial supplies，From farm planting to new overseas varieties to hybrid sweet potatoes，Gradually get rid of the marginal historical status，Given life by the Chinese、Humanity and culture，Its product value、Identity and meaning are also changing。

　　(This article is the Personal Project of the National Social Science Fund's unprecedented study special scholars "Corn bet365 live casino games History Information Integration Exam" (21vjxg015) in the Ming and Qing Dynasties (21vjxg015)

(Author is an associate professor at the Department of History at the School of Humanities of Southeast University)