| 1 | Granular Urea | 46-0-0 | Prills or granules | 46% N | Approximately 545 g/L | Broad-acre cereals, maize, rice, pasture, and blended fertilizers | High nutrient density and relatively efficient bulk transport; keep dry because moisture promotes caking. Surface-applied material can lose ammonia unless incorporated or followed by rainfall. |
| 2 | Ammonium Nitrate | 34-0-0 | Granules or prills | About 34% N | Approximately 1,900 g/L | Rapid crop response, top-dressing, cereals, grassland, and cool-season applications | Less dependent on soil hydrolysis than urea; requires strict regulatory compliance, segregation from combustible materials, moisture control, and secure storage. |
| 3 | Calcium Ammonium Nitrate | 26-28-0 | Granules | 26-28% N | Readily soluble; varies by formulation | Top-dressing, horticulture, grassland, and soils where lower alkalinity impact is preferred | Contains both ammonium and nitrate nitrogen and is generally less hygroscopic than straight ammonium nitrate; store in a cool, dry, ventilated area. |
| 4 | Urea-Ammonium Nitrate Solution | 28-0-0, 30-0-0, or 32-0-0 | Clear liquid solution | 28-32% N | Fully miscible with water | Liquid injection, fertigation, row crops, pasture, and precision application systems | No dust and easy to meter; freezing point depends on concentration, with UAN-32 freezing near 0°C. Use compatible tanks, pumps, and corrosion-resistant equipment. |
| 5 | Ammonium Sulfate | 21-0-0 + 24% S | Crystalline granules or fine crystals | 21% N | Approximately 750 g/L | Sulfur-deficient soils, oilseeds, cereals, rice, and alkaline or high-pH soils | Generally stable as a dry solid and less hygroscopic than urea; the ammonium form can gradually acidify soil, so soil pH should be monitored. |
| 6 | Anhydrous Ammonia | 82-0-0 | Pressurized liquefied gas | 82% N | Reacts readily with water | Large-scale row-crop production and subsurface application before planting | Very high nutrient density and low bulk volume; must remain in approved pressure vessels and requires trained personnel, specialized applicators, leak controls, and regulated transport. |
| 7 | Calcium Nitrate | 15.5-0-0 + approximately 19% Ca | Prills, granules, or soluble crystals | About 15.5% N | Highly soluble; approximately 1,200 g/L | Greenhouse crops, fertigation, vegetables, fruit, and crops requiring readily available calcium | Fast-acting nitrate nitrogen and calcium in a fully soluble form; keep dry and separate from concentrated phosphate or sulfate fertilizers to avoid precipitation in stock solutions. |