Researchers are experimenting with field covers of such nitrogen-rich plants as Berseem clover, said Jim Brandle, a university professor in shelterbelt ecology.
•布兰多（一位研究防风林生态学的大学教授）说，科研人员们正在尝试在农田里种植苜蓿等
氮量高的植物。
Researchers are experimenting with field covers of such nitrogen-rich plants as Berseem clover, said Jim Brandle, a university professor in shelterbelt ecology.
•布兰多（一位研究防风林生态学的大学教授）说，科研人员们正在尝试在农田里种植苜蓿等氮量高的植物。
Alfalfa Seeds (Lucerne Medicago Sativa), Persian Clover Seeds (Trifolium Resupinatum, Shaftal), Berseem Clover Seeds, Sesbania Seeds , Guar Seeds , Sorghum Sudan Seeds.
苜蓿
（紫花苜蓿）、波斯苜蓿（三叶草）、埃及苜蓿、高粱、瓜尔豆种子、苏丹田
。
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