What are the varieties and types of Setaria viridis?

Pennisetum is a kind of forage grass with high yield and feed value, which is widely planted in cold and humid areas of the world. It plays an important role in animal husbandry, grass industry and seed industry in developed countries, and nearly 100 cultivated varieties were cultivated by genetic breeding technology in the 20th century. In the construction of artificial mowing land and grazing land, the utilization rate of improved varieties has increased steadily.

From 1952 to 1954, among all common varieties produced in new york, USA, improved seeds only account for 1.0%, and from1-1962, improved seeds account for 32%. With the development of modern animal husbandry and the change of forage seed market demand, the breeding and development of Hericium erinaceus cultivars can be roughly divided into three periods. Heidemij( 1935), Dural( 1936), S-50( 1937) and Lorain (1937) were bred in Europe and North America in 1930s and 1940s. The 1950s and 1960s witnessed the great development of hedgehog breeding technology, and Europe and America were still the main countries. Using different strains as raw materials, a large number of cultivated varieties with excellent comprehensive properties were bred by using mixed selection and hybridization techniques. There are mainly Bamot (195 1), Ingemo (1952), Barrington (1964), Astra (1964) and Bunty (1). Seed production and trade of improved varieties occupy a large proportion in the international market. 197 1, identified by the Organization for International Economic Cooperation and Development, 66 species of Setaria viridis seeds have entered the international seed trade market. Since the 1970s, the demand for fern hay has also decreased due to the large reduction in the number of horses and mules. At the same time, the planting area of Pteridium parvum and Pterocarya rosewood with strong adaptability has been expanded, and the planting area of Pteridium parvum has decreased year by year, which has affected the breeding of cultivated varieties to some extent. However, the techniques of strain hybridization and mixed selection are still the main ones, and Clairc( 197 1), TORO (65438), Japan Agriculture and Forestry No.2 (1977), Agriculture and Forestry No.3 (1977) and Agriculture and Forestry No.4 (/kloc) The above cultivated varieties can be divided into three categories according to the utilization mode: ① Cutting type, which mainly has the characteristics of plant height, leaf height and late maturity, such as Milton, Lalin climax, Barriton, Bondi, Agriculture and Forestry 1, No.4 and so on. (2) Grazing type, which mainly has the characteristics of many tillers, strong regeneration and resistance to trampling, such as Heidemiji, S-50 and Essex.

(3) The dual-purpose model of mowing and grazing, which still maintains strong regeneration ability after mowing in flowering period and continues to be used for grazing, such as drummond, Champu, Toro, Timford, Nonglin No.5 and No.6, etc. 1990, the cultivated variety Erigeron Minshan was also bred in Gansu, China.