Brown rice comes from rice, and rice comes from the Yangtze River valley, including Jiangsu, Anhui, Shanghai, Zhejiang, Jiangxi, Hunan, Hubei, Sichuan Basin, Shaanxi and southern Henan, all of which are two seasons a year. Early rice varieties are mostly indica rice, and middle rice is mostly indica hybrid rice. Japonica rice is the main crop of continuous cropping and single cropping rice. South of Nanling, including Guangdong, Guangxi, Fujian, Taiwan Province, Hainan and southern Yunnan, are mostly double-season rice, and some are three-season rice; Indica rice is the main planting variety, and japonica rice is planted in mountainous areas.