Figure 2. Market prices for some common agricultural fertilizers. Key: Anhy.Am = anhydrous ammonia. Am. Nitrate = ammonium nitrate. TSP = triple super phosphate. Pot. Chloride = potassium chloride.
Line graph of prices $/ton for common fertilizers from 2000 to 2005

“Agricultural Prices,” U.S. Department of Agriculture, National Agricultural Statistics Service