Rice, commonly known as rice, is one of the important food crops for human beings and has a long history of planting and consumption. Half of the world's population eats rice, mainly in Asia, southern Europe and parts of tropical America and Africa. The total output of rice ranks third in the world, lower than that of corn and wheat, but it can feed a large group of people.
China is a country with the longest history of rice cultivation in the world. According to the research of Hemudu excavation in Yuyao, Zhejiang Province, rice was planted here as early as six or seven thousand years ago. Since the beginning of 2 1 century, a series of recent archaeological discoveries have consolidated this conclusion.
Rice is an important grain widely planted in tropical Asia. South China is the main rice producing area, and it is also cultivated in northern provinces. Seeds are mainly divided into two subspecies, indica and japonica. Subspecies include many cultivated varieties. Use ripe caryopsis as medicine. Sweet and warm. And digestion, spleen, appetite.
Morphological characteristics of rice: annual aquatic herbs. The culms are erect, with a height of 0.5- 1.5m, which varies with varieties. Leaf sheaths are loose and hairless; The ligule is needle-shaped, with a length of 10-25 cm, extending to the edge of the lower leaf sheath at the base of both sides, and has two sickle-shaped auricles; Leaf blade linear-lanceolate, about 40 cm long and 65438 0 cm wide, hairless and rough.