Liquid fertilizer UAN is a solution of urea with ammonium nitrate and contains 27.7 – 32.3% nitrogen. UAN has a neutral or slightly alkaline reaction, it is a transparent or yellowish liquid with a density of 1.26-1.33 g / cm3.
Fertilizer UAN practically does not contain free ammonia, which excludes loss of nitrogen during loading, transportation, storage and application to the soil. It can be applied with the help of high-performance units without simultaneous sealing in the soil, as well as with irrigation water.
The UAN solution with a corrosion inhibitor can be transported in conventional rail tank cars and tank trucks. The crystallization temperature of UAN solutions increases with an increase in the percentage of nitrogen from -18 ° C for UAN -28 and -2 ° C for UAN -32. The freezing point of solutions of all UAN brands is minus 26 ° С. The formation of crystals and short-term freezing of solutions of UAN in storage tanks is not of great danger, since with increasing temperature the crystals dissolve and the fertilizer completely restores its properties.
To store solutions, you can use storage tanks designed for ammonia water and utilities. When filling tanks intended for ammonia water, it must be taken into account that the density of the UAN is, on the average, 1.30 g / cm3. Fill tanks with UAN solution over 80% of the volume is not recommended, as exceeding this level you can lead to deformation of capacity and loss of fertilizer.
To prevent the crystallization and corrosion of metal for the UAN solution, ammonium phosphate or liquid complex fertilizers of the LCF brand NP = 10: 34, NP = 11: 37 at the rate of 0.2% P2O5 are added.