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Introduction How Rivers Run Stories Value Of A River What We Can Do
From Farmer to Shrimper: The Dead Zone
(pg 5 of 8)

Together, corn and soybean fields account for about half the nitrogen that reaches the Gulf.

In recent decades, farmers have also confined larger numbers of livestock to smaller parcels of land, with less land available for the distribution of manure. Animal manure accounts for about 15 percent of the nitrogen load reaching the Gulf.

In all, nearly 90 percent of the nitrogen bound for the Gulf of Mexico originates from nonpoint sources. The remainder comes from municipal and industrial point sources (such as municipal sewage treatment).

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Valley Creek
Gulf of Mexico
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