| Urea | 46-0-0 | Nitrogen (N) | Provides concentrated nitrogen. Soil microbes convert urea into ammonium, which can subsequently become nitrate. | Pre-plant or side-dress nitrogen applications for cereals, oilseeds, and many other crops. | Surface-applied urea can lose nitrogen as ammonia, especially in warm, windy conditions or on high-pH soils. Incorporation, rainfall, or an appropriate urease inhibitor can reduce losses. |
| Ammonium Nitrate | Typically 34-0-0 | Nitrogen (N), as ammonium and nitrate | Supplies nitrogen in both ammonium and nitrate forms; nitrate is readily available for root uptake. | Rapid nitrogen supply for field crops, pastures, and other crops where permitted. | Grades and availability vary by market. It is regulated in many jurisdictions because of safety and security risks; follow local storage, transport, and handling rules. |
| Ammonium Sulfate | Typically 21-0-0 + 24% S | Nitrogen (N) and sulfur (S) | Supplies ammonium nitrogen and plant-available sulfate sulfur. | Crops with sulfur requirements, including canola, cereals, and some vegetables; also used where an acidifying nitrogen source is suitable. | Its acidifying effect can matter with repeated use. Check soil pH and sulfur needs before application. |
| Diammonium Phosphate (DAP) | 18-46-0 | Nitrogen (N) and phosphate (P2O5) | Provides ammonium nitrogen and water-soluble phosphate for early root development and plant growth. | Pre-plant or planting-time phosphorus applications, often where both nitrogen and phosphorus are needed. | High concentrations near seeds can injure seedlings under some conditions. Placement should reflect crop, soil, and local recommendations. |
| Monoammonium Phosphate (MAP) | Commonly 11-52-0 | Nitrogen (N) and phosphate (P2O5) | Supplies ammonium nitrogen and phosphate; commonly used as a concentrated phosphorus source. | Starter and pre-plant programs for crops requiring phosphorus, subject to soil-test results. | Commercial grades can differ. Compare guaranteed analyses and consider seed-placement safety and soil conditions. |
| Triple Superphosphate (TSP) | Typically 0-46-0 | Phosphate (P2O5) | Provides concentrated, water-soluble phosphate without adding nitrogen. | Phosphorus applications when nitrogen is not required from the fertilizer source. | Phosphorus is relatively immobile in soil, so placement and timing should follow local agronomic guidance. |
| Muriate of Potash (MOP), or Potassium Chloride | Typically 0-0-60 | Potassium (K), reported as K2O; also contains chloride | Supplies soluble potassium, an essential nutrient involved in water regulation, enzyme activity, and crop quality. | Potassium programs for many field crops where soil tests indicate a need. | Its chloride content may be unsuitable for chloride-sensitive crops or some saline conditions. Check crop tolerance and soil test results. |
| Sulfate of Potash (SOP), or Potassium Sulfate | Typically 0-0-50 + about 17% S | Potassium (K), reported as K2O, and sulfur (S) | Supplies potassium and sulfate sulfur, with no chloride in the standard potassium sulfate product. | Potassium nutrition for chloride-sensitive crops and situations where sulfur is also required. | Usually has a lower potassium analysis than MOP and may have a higher cost per unit of potassium; compare delivered nutrient cost. |
| Calcium Nitrate | Commonly about 15.5% N + 19% Ca | Nitrate nitrogen (N) and calcium (Ca) | Provides readily available nitrate nitrogen and soluble calcium for plant uptake. | Fertigation and protected-crop production; calcium supplementation where agronomically justified. | Product composition varies. Confirm the guaranteed analysis, compatibility with other stock solutions, and the crop’s actual calcium requirement. |