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美国苜蓿(Medicago sativa)是多年生紫花苜蓿的一个品种,1977年美国友好人士韩丁带入我国,1980年引进我所。参与国内外32个绿肥品种试验,经4年观察:具有返青早,返青率高,早发性能好,再生能力强,鲜草产量高等特点。实践表明,既能直接作果园绿肥,又可兼作牲畜的饲料。现将观察结果介绍如下:一、形态及生物学特性美国苜蓿是多年生宿根豆科草本植物,根系为圆锥形,主根肥大而长。茎深绿或带棕紫色,初花期,茎自然高度114厘米,直立或匍匐,光滑,分枝多,中空,有白色的木质髓。根颈发达,由根颈生出15～30个枝。叶为三片小叶构成的复叶,第一片真叶为单叶。小叶呈倒卵形或长椭圆形,尖端稍有缺刻,呈锯齿状,后半部为全缘。花兰紫色,总状花序,花
American alfalfa (Medicago sativa) is a variety of perennial alfalfa. In 1977, Hillary, a friendly person from the United States, brought us into our country and introduced us in 1980. Participate in 32 green manure varieties at home and abroad, after 4 years of observation: with early greening, greening rate, early performance, regeneration ability, fresh grass yield characteristics. Practice shows that both direct green orchard fertilizer, but also doubly as livestock feed. The observations are as follows: First, the morphological and biological characteristics of the United States alfalfa Perennial leguminous herbs, root conical, the main root hypertrophy and long. Stem dark green or brownish purple, early flowering, stem 114 cm in height, erected or prostrate, smooth, branched, hollow, white woody pulp. Rooted neck developed by the root neck to produce 15 to 30 branches. Leaf for the three leaflets constitute the compound leaf, the first leaf is a single leaf really. Lobules were obovate or oblong, the tip slightly nicked, serrated, the latter part of the entire margin. Orchid purple, racemes, flowers