CEDAR RAPIDS, Iowa—The cover crop that blankets Dan Voss’ farmland from late fall into the spring comforts the Eastern Iowa farmer because he knows heavy spring rain won’t wash away his topsoil. These off-season crops also soak up excess fertilizer.
But for every Dan Voss, there are a thousand U.S. farmers not growing cover crops or using other conservation practices shown to reduce runoff.
Other agricultural practices—more tile drainage, more livestock and more fertilizer—are thwarting plans to slash nitrogen and phosphorus washing down the Mississippi River to the Gulf of Mexico, where excess nutrients threaten wildlife and fishing industries.
“The agricultural community, we need to get with it,” Voss said.
Cover crops grow on Dan Voss’s land near Palo, Iowa on Wednesday, Nov. 8, 2023. Photo by Nick Rohlman, The Gazette ” data-medium-file=”https://i0.wp.com/www.mississippifreepress.org/wp-content/uploads/2024/07/Voss-windshield_cred-Nick-Rohlman_The-Gazette.jpg?fit=300%2C200&ssl=1″ data-large-file=”https://i0.wp.com/www.mississippifreepress.org/wp-content/uploads/2024/07/Voss-windshield_cred-Nick-Rohlman_The-Gazette.jpg?fit=780%2C520&ssl=1″ tabindex=”0″ role=”button” src=”https://i0.wp.com/www.mississippifreepress.org/wp-content/uploads/2024/07/Voss-windshield_cred-Nick-Rohlman_The-Gazette.jpg?resize=780%2C520&ssl=1″ alt class=”wp-image-44769″ srcset=”https://i0.wp.com/www.mississippifreepress.org/wp-content/uploads/2024/07/Voss-windshield_cred-Nick-Rohlman_The-Gazette.jpg?resize=1024%2C683&ssl=1 1024w, https://i0.wp.com/www.mississippifreepress.org/wp-content/uploads/2024/07/Voss-windshield_cred-Nick-Rohlman_The-Gazette.jpg?resize=300%2C200&ssl=1 300w, https://i0.wp.com/www.mississippifreepress.org/wp-content/uploads/2024/07/Voss-windshield_cred-Nick-Rohlman_The-Gazette.jpg?resize=768%2C512&ssl=1 768w, https://i0.wp.com/www.mississippifreepress.org/wp-content/uploads/2024/07/Voss-windshield_cred-Nick-Rohlman_The-Gazette.jpg?resize=400%2C267&ssl=1 400w, https://i0.wp.com/www.mississippifreepress.org/wp-content/uploads/2024/07/Voss-windshield_cred-Nick-Rohlman_The-Gazette.jpg?w=1200&ssl=1 1200w, https://i0.wp.com/www.mississippifreepress.org/wp-content/uploads/2024/07/Voss-windshield_cred-Nick-Rohlman_The-Gazette-1024×683.jpg?w=370&ssl=1 370w” sizes=”(max-width: 780px) 100vw, 780px” data-recalc-dims=”1″>Cover crops grow on Dan Voss’s land near Palo, Iowa on Wednesday, Nov. 8, 2023. Photo by Nick Rohlman, The Gazette
Just one year away from a 2025 deadline to reduce nitrate and phosphorus entering the Gulf by 20%, success seems unlikely.
The Gulf of Mexico Hypoxia Task Force, a collaboration of state, federal and tribal agencies charged with controlling fertilizer pollution, told Congress last fall that nitrogen loads in the Mississippi River basin decreased 23% from the baseline period to 2021.
But the five-year running average—which accounts for extremely wet and dry years more common with climate change—tells a different story. By that measure, nitrogen is only slightly below baseline and well above the 20% target. Phosphorus loads worsened since the baseline period.
The oxygen-deprived ‘dead zone’ in the Gulf is predicted to be 5,827 square miles this summer, 5% larger than average, according to a forecast last week by the National Oceanic and Atmospheric Administration. Two long-time Gulf researchers predict a smaller ‘dead zone’, but only because of warming ocean temperatures, not because of progress reducing nutrients in the Mississippi River basin.
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