American Plant Food APF 050302F 5-3-2 Bio 100% Organic Fertilizer with Added Biologicals 100 SGN 50 lb. American Plant Food now offers Sigma 5-3-2 Bio with added biologicals. Derived from composted poultry manure and non-plant food ingredients like humate, silica, and root-dwelling microorganisms, this 100% organic fertilizer is designed for slow release, providing gradual nutrient uptake for up to 10 weeks. This product is ideal for golf courses and other landscape applications.