Cover crops are planted between main crops to prevent erosion and enrich the soil. Legume cover crops like peas and beans can fix nitrogen from the air and add it to the soil. Cover crops provide multiple benefits including preventing erosion, improving soil quality, suppressing weeds, and reducing insects. They can also prevent nutrient leaching and add nitrogen and organic matter to soils. Common cover crop models include winter cover crops, summer green manure crops, living mulches, catch crops, and forage crops.