Solutions

Easy Fix: How to Stop Poisoning Fish in the Gulf of Mexico

Saturated buffer along unnamed tributary to the Skunk River, Iowa. Photo by Kent Heikens USDA, Agricultural Research Service.

Fertilizer used on Iowa cornfields is killing marine life, but one scientist found an affordable way to put an end to the pollution.

There’s a 6,475-square-mile “dead zone” in the Gulf of Mexico. Roughly the same size as Connecticut and Rhode Island, this area located off the Louisiana coast becomes so polluted that it can’t support the fish and shrimp populations that are vital to southern fisherman. While actions by those living in the bayous play a part, the real cause is located 1,000 miles north: Iowa’s golden cornfields, whose runoff is dirtying the Mississippi River and its tributaries, says Dan Jaynes, a research soil scientist at the U.S. Department of Agriculture’s National Laboratory who’s studying ways to decrease the contamination.

Installation of saturated buffer along Bear Creek, Iowa. Photo by Kent Heikens USDA, Agricultural Research Service.

While the prairie’s black soil is extremely fertile — roughly 25 million acres of cropland were harvested last year — the former swampland is also excessively moist. “It’s a fairly flat landscape, so water has no place to go,” Jaynes says. That’s why, beginning a century ago, farmers in the Hawkeye State built artificial drainage systems (that consisted of four-inch-wide clay pipes buried a few feet underground; today, perforated, plastic tubing is used) to shunt water into streams.

Today, these small-scale systems add high levels of nitrates (a form of nitrogen) and phosphorous (additives that largely come from fertilizer) to nearby waterways. During the spring, these nutrients fuel algal growth, presenting a health hazard to the many cities like Des Moines and Cedar Rapids that obtain their drinking water from the rivers. (Des Moines’s water utility has filed a controversial federal lawsuit against drainage districts upstream.)

Jaynes has a simple solution to the problem that’s impacting the entire Midwestern Corn Belt, from Ohio to southern Minnesota: just shift […]

Summary
Article Name
Easy Fix: How to Stop Poisoning Fish in the Gulf of Mexico
Description
The cause of the "dead zone" in the Gulf of Mexico lies 1,000 miles north: Iowa’s golden cornfields are dirtying the Mississippi River and its tributaries. Dan Jaynes has an easy fix.
Author
Publisher Name
Nation Swell
Publisher Logo

Recent Posts

Saltwater intrusion will taint 77% of coastal aquifers by century’s end, modeling study finds

Watersheds on the U.S. Eastern Seaboard will be among the areas most affected by underground…

1 week ago

A ‘Devil’ Seaweed Is Spreading Inside Hawaiʻi’s Most Protected Place

An invasive algae has wrecked huge sections of reef in Papahānaumokuākea Marine National Monument. Scientists…

1 week ago

A meadow in the Tahoe National Forest was drying up with sagebrush. Now it’s a lush wetland.

Sardine Meadow is a key link in conservation efforts for the Sierra Nevada, north of…

2 weeks ago

Conservation & Sustainability: fertilizer nitrates

UC Davis researchers insert a device that continuously collects water samples underground, providing real-time data…

3 weeks ago

Drought Mitigation: Should We Be Farming in the Desert?

Irrigated farmland in the desert of the Imperial Valley. (Photo credit: Steve Proehl, Getty Images)…

3 weeks ago

Scathing report released detailing Navy’s handling of Red Hill fuel spill

The Inspector General of the Department of Defense released some scathing reports Thursday over the…

1 month ago