Crop rotation with cover crops can help maize plants get nitrogen from both fertilizer and cover crop residues. Legume cover crops can provide as much nitrogen to maize as 80-108 kg/ha of urea fertilizer. Maize plants can use about 43.5% of the urea nitrogen applied. Legume cover crops can replace more than 80 kg/ha of nitrogen fertilizer for corn production, which is good for the environment and saves money.