引进牧草应注意的一个问题是要了解哪些牧草是否有毒,不能见种就引。据作者介绍:1939—1945年欧洲一些国家曾用石蒜科郁金属和百合科风信子属、水仙属植物的鳞茎及唐菖蒲的地下茎喂牛,发生过严重的中毒和死亡。1954年美国引入藜科的盐生草,因该草含有34.5％的草酸盐,致使绵羊和牛遭受极大损失。英国生长的杜鹃花科植物, One of the issues to be aware of when introducing forages is to know which forages are toxic and can not be seen. According to the author: In 1939-1945, some countries in Europe used to have severe poisonings and deaths with Amaryllidaceae and Liliaceae hyacinth, bulbs of Narcissus and underground stems of Gladiolus. In 1954, the United States introduced the salt grass of Chenopodiaceae, which contains 34.5% of oxalate, resulting in great losses of sheep and cattle. British rhododendron plants growing,