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The Corn That Grows Itself
How microbes could upend America’s toxic dependence on nitrogen fertilizer
Crabs, clams, and worms die almost immediately. Fish, shrimp, and any animal that can swim quickly enough make valiant, though often doomed, efforts to flee. There are few places to go in a dead zone that can reach the size of New Jersey.
The Gulf of Mexico hypoxic zone — or “dead zone,” as it’s more commonly known — is a stretch of seawater where vast swaths of slimy algae bloom annually. When the algae eventually die, they decompose, sucking up so much of the water’s oxygen that all nearby aquatic life suffocates. In 2017, this dead zone measured 8,776 square miles, the largest since scientists at the National Oceanic and Atmospheric Administration began recording it in 1985. This summer’s dead zone is expected to be the second-largest on record at 8,717 square miles, according to scientists at Louisiana State University.
You can find the source of the dead zone by traveling north out of the Gulf, up the Mississippi River, and through its tributaries as they branch out into the agricultural nervous system of the U.S. In the rich, black soil of the Midwest, you’ll find the culprit: nitrogen fertilizer, the backbone of modern industrial farming.
