作者描述了美国南部的气候条件和这一地区的一些主要牧草的生长情况,评述了白三叶、绛三叶、地三叶和三叶草(T.vesi-culosum)引入这一地区,以及三叶草与禾草混播的优点。美国南部草地的牧草品质差而需要氮肥。三叶草的引入,给草地提供了 The authors describe the climatic conditions in the southern United States and the growth of some of the major forages in the area and review the introduction of T. cloi-culosum into the area, The advantages of mixed grass. Grass in the southern United States grass is poor in quality and needs nitrogen fertilizer. The introduction of clover, provided to the grass