4. Jinhe rice is produced from high-quality Wuchang rice, and the soil is the root of rice. Wuchang is one of the three black soil belts in the world. After thousands of years, the average thickness of grass carbon black soil layer is about 1 m, and the thickness of grass carbon soil in forest area is as much as 3 meters, in which the organic matter content is as high as 10% or more, and the three major water systems, Lalin River, Mangiu River and Xilang River, are irrigated by gravity. Because of the unique geographical and climatic characteristics of Wuchang rice producing area, its dry matter accumulation is more and amylose content is moderate.