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北欧和美洲大陆许多国家,其土壤气候条件对种植大多数农作物来说是不适宜的。因此,这些国家是以放牧地和刈草地为主。饲料生产的经验表明,多年生牧草乃是最有前途的。因为通常它们对栽培条件要求不高,不仅能充分利用有限的土壤气候资源,而且具有极高的饲料价值。这一地区许多国家的多年生牧草育种已从事了近一个世纪。其育种的主攻目标乃是提高植株的越冬性,能够在肥力低和冻土上种植,耐淹浸,在夏季短的极地长日照下也能速生和繁茂,在多次刈割和长期践踏下,
Many countries in Northern Europe and the Americas have soil-climatic conditions that are not suitable for growing most crops. Therefore, these countries are mainly grazing land and mowing land. Experience with feed production shows that perennial grasses are the most promising. Because they are usually less demanding on their cultivation conditions, they not only make full use of the limited soil and climatic resources but also have very high feed values. Perennial pasture breeding has been practiced in many countries of the region for nearly a century. The main goal of breeding is to improve the plant’s winter, can be planted in low fertility and permafrost, flooding, in the summer short polar long daylight can also be fast-growing and lush, in a number of cutting and long-term trampling ,