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Cover Crops

The educational materials listed on this page are about Cover Crops.

What is a cover crop? A common definition of a cover crop is a plant that is used as part of a crop rotation to improve the soil, scavenge or add nutrients, smother weeds and as a tool for erosion control. Cover crops are not harvested, but are left in place in no-till farming or turned under, especially in organic farming. Another term for cover crops is green manures, especially when the crop residue is incorporated into the soil.

Cover crops can improve soil fertility by adding organic matter, and they help in nutrient management planning by adding nitrogen to soil or by taking up nutrients in soil after cash crop harvest. Winter cover crops are most common in corn and soybean grain production systems, while spring cover crops or summer cover crops can fit many vegetable production systems. Cover crops improve soil moisture, especially over time as soil organic matter and soil tilth are improved.

Cover crop cocktails are used by many farmers as a way to improve soil health. Cocktails or cover crop mixes usually include a grass cover crop such as cereal rye or annual ryegrass, a legume cover crop like crimson clover or hairy vetch, and sometimes a brassica cover crop like forage radish, sometimes called “tillage radish.” Cover crop benefits from cocktails are often greater than seeding a single cover crop species. Cover crop mixes contribute to pest control by attracting beneficial insects and they may increase weed control by providing more ground cover and leaving more crop residue on the soil surface. Some cover crops can mitigate plant disease by suppression soil pathogens. Cover crop cocktails also attract pollinators, including native pollinators.

Cover crop seed is increasingly available from seed companies. They may also be able to help you with information about cover crop selection as well as best timing and methods of planting cover crops.

Some SARE books will help you decide how and when to grow cover crops. Managing Cover Crops Profitably, Crop Rotation on Organic Farms, and Building Soils for Better Crops are comprehensive guides or manuals. Another useful resource is the SARE topic brief Cover Crops for Sustainable Crop Rotations, which summarizes the usefulness of rotating cover crops in any cropping system. For organic farming, see the Organic Transitions business planning guide.

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Rotational Grazing with Cover Crops Case Studies

Since rotational grazing of cover crops is not a common practice, to address some of the current questions from farmers in the upper Midwest, the Sand County Foundation of Wisconsin partnered with the Sauk Soil and Water Improvement Group and the University of Wisconsin-Madison to explore short-term agronomic and environmental costs and benefits of managed […]

Pollinator-Friendly Cover Cropping for Vegetable Producers in the Upper Midwest

Growers are increasingly interested in adding cover crops to rotations to improve soil health, break disease cycles, and provide ecosystem services. In addition to these benefits, cover crops present an opportunity to add crucial floral resources and habitat for pollinators and other beneficial insects on the farm. However, identifying appropriate cover crop species and management […]

Spring-Grazing Cover Crops with Nebraska’s Knuth Farms

When a fourth-generation farm in Mead, Nebraska began to diversify their primarily cash crop operation in 2012, they gave some thought to cover crops and livestock. Knuth Farms didn’t want to buy cattle or become beef producers, but they did want to diversify their income stream, capture some of the soil benefits of cover crops, […]

Illinois Farmer Builds Precision Seeder to Maximize Cover Crop Advantage

Ralph “Junior” Upton is no novice when it comes to no-till and cover crops. His grain farm in the northeast corner of Hamilton county Illinois is 100% no-till with 1,800 acres of corn, beans, and wheat, and approximately 1,200 acres in cover crops. Upton has been farming more than 50 years, and the farm has […]

Cover Crop-based Reduced Tillage for Fall Production of Cabbage,Cauliflower and Broccoli Using a Roller-Crimper and No-Till Planting Aid

Cover crops can reduce erosion, improve soil health, slow weeds, enhance nutrient and moisture availability, control pests, and offer other benefits to vegetable producers. After vegetable grower, Thomas Ruggieri, planted cover crops on his farm in rural Clay County, Missouri in 2004, he noticed dramatic improvement in soil fertility and plant health. Ruggieri and Rebecca […]

Economics of Grazing and Haying Cover Crops in North Central Kansas

Grown on an estimated 10 million acres across the country, cover crops are becoming an indispensable part of crop rotations. To maintain this momentum, the development of reliable information at the local level—how to craft a diversified rotation that pays—needs to keep pace with growth in farmers’ interest. That is what motivated Josh Roe to […]

Cover Crop Termination

Farmers use cover crops to slow erosion, improve soil health, enhance water availability, smother weeds, help control pests and diseases, and increase biodiversity on their farms. Although cover crops can be partially grazed or used as forage, they are usually terminated before planting production crops. While row crop producers tend to prefer using herbicides to terminate, most vegetable/horticulture crop producers employ tillage as their primary means of termination. Some organic no-till producers use roller-crimpers to kill the cover crop and leave the mulch on the soil surface to conserve water. NCR-SARE has supported various research projects that have explored the advantages and limits of various cover crop termination strategies.

Utilizing Cover Crops to Increase Productivity, Health and Vigor on Tame Grass Pasture

Donnie Feiring owns and operates Feiring’s Cattle Co. in Beach, ND, a 120-head registered Black Angus cow calf operation. They also run 35 head of commercial yearling heifers. Feiring wanted to improve the health, vigor and productivity of 50 acres of tame grass pasture - tame pastures are cultivated fields planted with introduced (non-native) grass […]

Adapting Cover Crops to Northern Climate Conventional Cropping Systems

Northeast Minnesota is home to a large beef cow-calf sector, several dairy farms, and an increasing amount of cash grain farming. In each of these types of operations, annual cultivation of corn, soybeans, oats, and barley is common. Annual cultivation of these crops can lead to high rates of nutrient leaching and soil erosion, decreased […]

Producers and Researchers Collaborate to Improve Soil Health in North Dakota

Soil—and whole farms—have been renewed through soil-improving practices like cover crops and no till. In the semiarid plains of western North Dakota, a team of producers and researchers are working to boost soil health for improved yield stability, farm income, and natural resource health of farms. The Southwest North Dakota Soil Health Project is a […]