When was the lotus root introduced to China?

About 1940, China was introduced from the United States for cultivation. Therefore, the cultivated lotus root originated or originated in Europe. The origin of cultivated species is consistent with the geographical distribution center and evolution center of wild species. After 100 years of cultivation and breeding, a large number of excellent cultivated varieties have been cultivated and become world-famous leguminous forage crops. Widely planted for grazing, drying hay or silage feeding livestock, and can also be used as green manure; It is also a good soil and water conservation plant, honey source plant and flower plant. At present, the United States, Canada, France, Britain, Australia, New Zealand, Brazil, Argentina, Japan and other developed countries have large-scale farming.