Milorganite Classic Is A Professional Turfgrass Organic Nitrogen Fertilizer With A 6-2-0 Formula. This is a stronger formula in a larger bag than discounters carry. The nitrogen in Milorganite Classic is released as plants need it. Does not run off or leach through the soil. Contains no salts. Can be applied in hot, dry weather. Classic contians 4% organically complexed iron that will not stain and will keep lawns a deep green all summer. Milorganite Classic offers a consistant and reliable product. Milorganite is recycled bioproducts. May be safely used on lawns, vegetables, flowers or anywhere else you would use a fertilizer. One 50 lb. bag covers up to 5,000 sq. ft.