Urea Ammonium Nitrate Solution (UAN) is classified as a nitrogen solution. It is a water solution, which is made by blending urea and ammonium nitrate solution. There are various types of formulated nitrogen solutions with various combinations of nitrogen containing salts in a solution with water, the various types are as follows:
- Ammonium Nitrate Solution
- Calcium Ammonium Nitrate Solution
- Urea Ammonium Nitrate Solution
UAN is the most popular nitrogen solution and is used as a direct application fertilizer or as a blending agent in liquid or suspension mixed fluids.
It is a liquid that is surface-applied as a result UAN is used extensively for side-dress applications and for no-till or minimum till farming. It is widely used for side dressing cotton, vegetables, corn, beets and other crops. Sprinkler applied UAN solution is used for tree crops such as almonds, for cereal grains, potatoes and for many other crops.
Some of the benefits of using UAN are:
- It is easier and safer to handle and apply than other nitrogen fertilizers (especially ammonia and ammonium nitrate).
- It can be applied more uniformly and accurately than solid nitrogen sources.
- Many pesticides are compatible with UAN solutions and both can be applied simultaneously, eliminating one pass across the field.
- It can be applied through various types of irrigation systems.
- When applied to wheat it can be more efficient than broadcast applications of dry materials.
- It can be safely transported in pipelines, barges, and railcars, which are less expensive and hazardous than the containers required for anhydrous ammonia.
- Low-cost storage facilities can be used thus making them more economically than most other nitrogen products.
It is used mainly is highly developed agricultural economies such as the United States and France, with little consumption being noted in developing countries. North America accounts for approximately 70% of world UAN usage whilst West Europe accounts for approximately 23%.