论文部分内容阅读
联合国科教组织的植物生理学家Gary H.Heichel说:“土壤的高氮水平,可降低紫花苜蓿苗子的根瘤产量。”明尼苏达州综合大学的科学家Paul,Heichel曾鉴定过苗龄为三个星期的紫花苜蓿的叶伸展、根生长和根瘤数量。当植株生长在无氮条件下,用一种草苜犀(Rhizobium neliloti)根瘤菌接种,那未,它们比生长在无氮条件下,而且不接种的植株,产生了较多的根瘤,较多的根,同时叶片也伸展得更大些。
According to Gary H. Heichel, a plant physiologist at UNESCO, “High nitrogen levels in the soil reduce nodule production in alfalfa seedlings.” Paul, Heichel, a scientist at the University of Minnesota, has identified purple flowers of three weeks old Alfalfa leaf stretch, root growth and nodule number. Rhizobium neliloti was inoculated with Rhizobium neliloti when the plants were grown under nitrogen-free conditions, and they were more nitrogen-free than non-nitrogen-denatured plants, producing more nodules and more Roots, while the leaves are also stretched more.