世界上的牧草种子生产草地在地球上陆地面积中占有很大比例．美国国土面积的５２％被草地占据。在欧共体各国，农用土地的５６％被用来种植牧草和饲料作物．欧美各国对草地和牧草的重要性认识较高，因而在牧草的育种研究等方面投入了很大的精力，在相应的法规制定上也较严... Grasslands in the world produce grasslands that make up a large proportion of the land area on Earth. 52% of the country’s land area is occupied by grasslands. In the EC countries, 56% of agricultural land is used to grow forage and forage crops. Europe and the United States have a high level of awareness of the importance of pasture and pasture, and have devoted a lot of energy to the research of pasture breeding and other related laws and regulations.