7、红三叶(Trifolium pratense):在日本早期的历史中是没有红三叶的,19世纪60年代开始从国外引进栽培。尽管红三叶作为饲料利用的期间仅短暂的2-3年,但它能在短期内获得高产量。此外,因其是豆科植物,能在空气中固氮以供给和提高土壤肥力。在寒冷地区,它作为豆科饲料和猫尾草,鸭茅混播后,适于制作干草。红三叶育种是由北海道农业试验场和Snow Brand种子公司主要采用群体选择法进 7, red clover (Trifolium pratense): Japan’s early history is not red clover, the 1860s began to introduce cultivation from abroad. Although the use of red clover as feed only a short period of 2-3 years, but it can be in short-term high yields. In addition, because it is a legume, it can fix nitrogen in the air to supply and improve soil fertility. In cold regions, it is suitable for making hay as legume forage and Timothy, after mixed sowing. Red clover breeding by Hokkaido Agricultural Experimental Site and Snow Brand seed companies mainly use group selection method