中国是一个农业大国,同时也是一个开放的国家,反映在农业生产上的一个特点就是,作物品种既有本土产品,也有域外引进的优秀品种。中国引进农作物有两个高潮,一个是汉代,随着丝绸之路的开辟,大量农作物沿丝绸之路传入到内地,一个是明清之际,随着地理大发现,大批美洲作物传入中国。四川大学的张箭教授对西方地 As an agricultural country and also an open country, China is characterized by a combination of both indigenous products as well as outstanding varieties imported from abroad. The introduction of crops in China has two upsurges, one is the Han Dynasty, with the opening of the Silk Road, a large number of crops along the Silk Road was introduced to the Mainland, one is the Ming and Qing Dynasties, with the geographical discovery, a large number of American crops introduced to China . Professor Zhang Jian of Sichuan University to the West