Nitrogen runoffs from farms can create large dead zones, like those in the Gulf of Mexico. microrganisms Algae microorganisms in the water overpopulate because of the surplus nitrogen.

• 从农场流失的氮可以制造大面积的死亡区域，比如像墨西哥湾。水中的海藻微生物过多是因为剩余的氮。