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
风林生态学的大学教授）说，科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.
吉姆•布兰多（一位风林生态学的大学教授）说，科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.
苜蓿籽（紫花苜蓿）、波斯苜蓿籽（三叶草）、埃及苜蓿籽、高粱籽、
种子、苏丹田菁籽。
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