Description
Urea Ammonium Nitrate (UAN) solution, produced by combining urea, nitric acid, and ammonia, is a liquid fertilizer product with a nitrogen content that typically ranges from 28 percent to 32 percent. UAN can be applied more uniformly than non-liquid forms of fertilizer.
Synonyms
UAN;Urea ammonium nitrate;azane: nitric acid: urea;Nitrogen solutions (UAN);Nitric acid ammonium salt, mixt. with urea;Urea, mixt. with ammonium nitrate
Application
It can be mixed with herbicides, pesticides, and other nutrients, enabling farmers to reduce costs by applying several materials simultaneously rather than making several separate applications.Solutions of UAN are widely used as a source of N for plant nutrition. The NO₃- portion (25 percent of the total N) is immediately available for plant uptake. The NH₄+ fraction (25 percent of the total N) can also be assimilated directly by most plants, but is rapidly oxidized by soil bacteria to form NO₃- (nitrate). Soil enzymes hydrolyze the remaining urea portion (50 percent of the total N) to form NH₄+, which subsequently transforms to NO₃- in most soil conditions.
Solutions of UAN are extremely versatile as a source of plant nutrition. Its chemical properties, make UAN compatible with many other nutrients and agricultural chemicals, so its frequently mixed with solutions containing phosphorus, potassium and other essential plant nutrients. Fluid fertilizers can be blended to precisely meet the specific needs of a soil or crop.
UAN solutions are commonly injected into the soil beneath the surface, sprayed onto the soil surface, dribbled as a band onto the surface, added to irrigation water, or sprayed onto plant leaves as a source of foliar nutrition. However, UAN may damage foliage if it's sprayed directly on some plants, so dilution with water may be needed.
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