13-13-13 Premium Fertilizer has a guaranteed analysis of 13-13-13. Nitrogen for growth and color, Phosphate for root growth, and Potash for plant health. A lawn will typically utilize 1 to 4 pounds of Nitrogen per 1,000 square feet per growing season. A 50 lb bag of fertilizer will typically cover 5,000 to 10,000 square feet. Re-application should not occur any sooner than every 4 weeks. Fertilizer should not be applied if drought conditions exist.