UAN

Urea ammonium nitrate solution ( also ammonium nitrate -urea solution or in short: AHL ) is a pressure-free, nitrogen liquid fertilizer.

Composition and properties

AHL (or UAN = Urea Ammonium Nitrate ) is a colorless liquid mixture of ammonium nitrate, urea and water. Commercial grades have 32, 30 and 28 % by weight of nitrogen.

* At 15.6 ° C

AHL with 28 percent by weight of nitrogen ( N) is composed of 7% nitrate nitrogen, ammonium nitrogen, 7% and 14% amide nitrogen (from urea). The pH is for the commercial product at 7 to 7.5, which is set with a slight excess of ammonia during the manufacture ( reduced corrosion during storage and transportation, reducing the decomposition of urea and ammonium nitrate). AHL has a higher density (1.28 g / cc) than water. The Ätzintensität the non-volatile, slight odor of ammonia AHL is similar to brine or brine.

Thus, the following reference values ​​are important:

To control the nitrogen content, a liter of AHL are weighed ( at 15 ° C 1.28 kg weigh ). Needed to Kalkausgleich 1 kg pure nitrogen from AHL 1 kg of calcium oxide (CaO ).

AHL attacks bare iron and non-ferrous metals. All fluid-carrying parts must be liquid fertilizer proof. Its properties change by adding water. AHL may cause water plant burns at too high a dose or even at certain mixing ratios.

Applications

The most common applications are held to the first nitrogen application in spring cereals and rapeseed cultivation. When grain lends itself to almost all areas where autumn no weed control was carried out, the possibility of combining herbicides with AHL.

The other fertilising measures in grains can be performed with special application technique: Firstly, multi-hole nozzles which deliver individual beams and thus reduce the contact area with the grain. In addition, drag hoses, the AHL to deploy close to the ground.