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学
大学教授）说，科研人员们正在尝试在农田里种
等
氮
物。
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学大学教授）说，科研人员们正在尝试在农田里种等氮物。
Alfalfa Seeds (Lucerne Medicago Sativa), Persian Clover Seeds (Trifolium Resupinatum, Shaftal), Berseem Clover Seeds, Sesbania Seeds , Guar Seeds , Sorghum Sudan Seeds.
籽（紫花）、波斯籽（三叶草）、埃及籽、粱籽、瓜尔豆种子、苏丹田菁籽。
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