The Illinois Fertilizer & Chemical Association’s Keep it 4R Crop program is based on the principles of 4R nutrient stewardship described earlier as: right source, right rate, right time, and right place (www.ifca.com/4R). The association works closely with members, including fertilizer manufacturers, distributors, and agriculture retailers, to promote the 4Rs and uphold the IFCA 4R Code of Practice, which promotes education and voluntary adoption of specific fertilizer management practices designed to reduce nutrient losses and assure nutrient use by the crop.
