Soil erosion is becoming a big problem, affecting farming, water quality, and ecosystems everywhere. It happens when soil gets washed or blown away, often because of deforestation, certain farming methods, or extreme weather. Protecting our land is essential, and one solution that’s showing a lot of promise is prairie strips.
Prairie strips are also known as buffer strips, vegetative strips, or terraces. Whatever you call them, they’re great for the environment. These strips, 30 to 120 feet wide, are rows of native plants placed in crop fields, often in areas with low yields and high runoff. They help improve soil health and protect fertile fields from heavy rain and storms, which are becoming more frequent. Research shows converting just 10% of a corn or soybean field into prairie strips can reduce soil erosion, lower nutrient pollution, store carbon, and provide habitat for pollinators and birds. Learn more about prairie strips from Iowa State University.
According to Iowa State University, prairie strips vary in width to handle different water flow levels. Wider strips are placed where more water flows downslope, while narrower strips work where less water flows.
The type of plants used also matters. For example, exotic grasses like smooth brome and Kentucky bluegrass are common in the U.S. Corn Belt but have weak stems that flatten in heavy rain. These are better for waterways designed to direct water while reducing erosion.
Native tall-grass prairie plants, like Indiangrass, big bluestem, and wildflowers, have stiff stems that hold up better in heavy rain. They’re more effective at slowing water flow and stopping sediment movement. The USDA Natural Resources Conservation Service provides guidelines on selecting the best plant species for prairie strips.
Prairie strips are a great way to support pollinators, which have been struggling due to habitat loss, pesticides, diseases, parasites, and changing weather patterns. These strips give pollinators the food and shelter they need to cope with environmental challenges. Research shows fields with prairie strips have more diverse and abundant pollinators compared to areas without native plants.
Grassland birds, which are declining globally due to habitat loss from agriculture, also benefit from prairie strips. Research reveals prairie strips increase bird activity on farmland, even aiding some grassland species of conservation concern. However, they are not ideal for area-sensitive species like bobolink and Henslow’s sparrow. To truly support grassland birds, larger patches of grassland habitat are necessary. Future research should focus on whether these larger areas can balance agricultural production with biodiversity or if they need to be managed specifically as conservation reserves.
Prairie strips qualify for federal and state cost-share programs, helping farmers cover costs of $28 to $39 per protected acre each year, according to the University of Iowa Extension and Outreach. The Conservation Reserve Program managed by the United States Department of Agriculture has boosted the use of prairie strips in recent years, with new incentives aiming to expand adoption.
Prairie strips may be small, but they bring huge benefits, like better soil conservation, improved nutrient retention, more wildlife habitat, and long-term boosts to the productivity and sustainability of farmland. Just a little can make a big difference!
