Growing Returns

Fertilizer runoff is just one piece of the dead zone puzzle

By Eileen McLellan / Bio / Published: October 21, 2015

Dead zones (also called hypoxic zones) are caused by a rapid growth in algae that leads to less dissolved oxygen in the water and the death of aquatic species. Credit: Ohio Wetlands Association

It’s true that fertilizer runoff, sewage, and other pollutants from the Corn Belt have significantly boosted dead zones in the Gulf of Mexico. That’s because up to half of the fertilizer applied isn’t absorbed by crops, and in order to grow more food we’re using 20 times more fertilizer in the Corn Belt today than in the 1950s.

But even if we optimize fertilizer use on all cropland in the Upper Mississippi and Ohio River Basins, nutrients will still be lost to rivers and streams and carried into the Gulf of Mexico. Some of this loss is inevitable given factors like unpredictable weather, but my colleagues and I set out to quantify other reasons for why the Corn Belt exports so much nitrogen.

We discovered that an increase in fertilizer inputs is only one part of the problem. Three other distinct but interconnected factors also contribute to water pollution and the Gulf dead zone: the loss of perennial cover, the construction of artificial drainage systems, and the loss of wetlands. Read More »

Also posted in Agriculture / Tagged agriculture, conservation, corn, cover crops, dead zone, farmers, farms, food, food production, Gulf of Mexico, nitrogen, nutrient efficiency, nutrient pollution, row crop, wetlands | Comments are closed

Collaboration can save the Mississippi River watershed

By EDF Blogs / Bio / Published: October 14, 2015

By Suzy Friedman, Director, Agricultural Sustainability, Environmental Defense Fund and Max Starbuck, Director, Market Development, National Corn Growers Association

Credit: America’s Watershed Initiative

Today, a diverse group of more than 400 businesses, associations, government agencies, science organizations, academic institutions and non-profit organizations released the first-ever report card evaluating the condition of one of our nation’s most storied and central waterways. This effort, known as America’s Watershed Initiative, was undertaken to provide information on the challenges facing the waters and lands that make up the 31-state Mississippi River Watershed and the 250 rivers that flow into it.

The overall mark was less than stellar, a D+. However, the process of grading has yielded a pathway to improvement.

Why the poor rating? The watershed continues to experience increased pressure from the demands of urbanization, agriculture, transportation and land development.

Fortunately, moving from a “D+” to an “A” grade is achievable – with new levels of understanding and collaboration. That’s why the Environmental Defense Fund and the National Corn Growers Association have a real desire to work together on this and similar initiatives. Read More »

Posted in Coasts and Watersheds / Tagged agriculture, America's Watershed Initiative, AWI, conservation, environmental defense fund, farmers, farms, food production, food security, National Corn Growers Association, NCGA, nitrogen, nutrient efficiency, soil health, SUSTAIN, sustainability, United Suppliers, water quality | Comments are closed

Water filters can fight dead zones without hindering farm production

By Eileen McLellan / Bio / Published: August 15, 2014

Updated (October 23, 2014): Interior, Agriculture Departments Partner to Measure Conservation Impacts on Water Quality

A treatment wetland built under the Iowa Conservation Reserve Enhancement Program. Photo from Iowa Department of Agriculture and Land Stewardship

“Is the water safe?”

In the United States, we take it for granted that the answer to that question is “yes.” But the residents of Toledo, OH, learned recently that their water wasn’t safe to drink for a few days because toxins associated with an algal bloom in Lake Erie had contaminated the city’s water supply. Meanwhile, a Maryland man was released from the hospital after nearly losing his leg and his life to flesh-eating bacteria contracted from swimming in the Chesapeake Bay.

These types of incidents are caused by nutrient pollution. Although nutrient pollution can come from many sources, runoff from agriculture is the dominant contributor to the problem in Lake Erie, the Chesapeake Bay and the Gulf of Mexico. Agriculture-associated nutrient pollution also impacts local streams and lakes, causing fish kills and closing swimming beaches. A recent study in Minnesota suggested that more than 70 percent of nitrogen in state waters comes from cropland.

What needs to be done, and how much will make a difference? Read More »

Also posted in Agriculture / Tagged Chesapeake Bay, dead zone, Gulf of Mexico, hypoxia, Interior department, Lake Erie, natural resources conservation, nutrient pollution, USDA, USGS, water quality, watershed, wetland buffer | Comments are closed