Contains slow release Nitrogen for long lasting results plus high Iron content along with other trace elements to produce super greening power. Use on Centipede lawns and Bluegrass, perennial Ryegrass, Fescue, St. Augustine, Bahia, Bermuda, Zoysia and Bentgrass lawns. Coverage: 4,000 sq. ft. Apply in the spring and fall. Will Prevent and Correct Yellow Grass Foliage. Always Read and Follow Label Directions. Formerly 10767