A 21-0-0 with 24% Sulfur fertilizer, which is Ammonium Sulfate (AMS), is used to provide quick nitrogen for lush green growth and sulfur for plant development, especially in sulfur-deficient or alkaline soils, benefiting lawns, vegetables, fruits, and ornamental plants by promoting greening and strong root growth. It's ideal for cool-season applications, helping acidify soil and improve nutrient uptake for various crops and turf.