Researchers are experimenting with field covers of such nitrogen-rich plants as Berseem clover, said Jim Brandle, a university professor in shelterbelt ecology.
吉姆•布兰多（一位研究防风林生态
教授）说，科研人员们正在尝试在农田里种植
蓿等
氮量高植物。
车轴草,亚历山
车轴草Researchers are experimenting with field covers of such nitrogen-rich plants as Berseem clover, said Jim Brandle, a university professor in shelterbelt ecology.
吉姆•布兰多（一位研究防风林生态教授）说，科研人员们正在尝试在农田里种植蓿等氮量高植物。
Alfalfa Seeds (Lucerne Medicago Sativa), Persian Clover Seeds (Trifolium Resupinatum, Shaftal), Berseem Clover Seeds, Sesbania Seeds , Guar Seeds , Sorghum Sudan Seeds.
蓿籽（紫花蓿）、波斯蓿籽（三叶草）、
蓿籽、高粱籽、瓜尔豆种子、苏丹田菁籽。
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