All common UAN solutions (28%, 30% and 32%) are formulated to contain 50% of actual N as amide, (from urea), 25% as ammonium (from ammonium nitrate), and 25% as nitrate (from ammonium nitrate). Soil Reactions - The urea portion of UAN solutions reacts just as dry urea does (see previous section on urea).
1.3 Urea Urea (NH 2CONH 2), which is also known as carbamide, carbonyl diamine, carbamimidic acid, and isourea, was the leading nitrogen fertilizer worldwide in the 1990s ( Kroschwitz & Howe-Grant 1995b). Urea is a stable colourless and odorless solid at room temperature that will melt at 135 °C.
Urea is 46 per cent nitrogen and 50 kg of urea theoretically contains the equivalent of 143 kg of protein (kg nitrogen x the conversion factor – 6.25 ie 23 kg N x 6.25 = 143.7 kg). The rumen conversion of npn to protein depends on a number of factors, the most important are a suitable source of energy and sufficient sulphur.
Therefore, only 22.6% of the nitrate is actually N, which means that, 45 lbs of nitrate contain 10 lbs N. In reports of soil and water analyses, the nitrate or nitrate-N concentration is generally reported in mg/kg or ppm (parts per million). A nitrate-N concentration of 10 ppm in one foot of the soil profile corresponds to roughly 35 lbs N/acre.
0.1 kg CO 2 5.6 kg CO 2 eqv 75 kg CO 2 75 kg CO 2 10 . ... kg CO 2 equivalents per kg urea nitrogen Source: Fertilizers Europe (2016) for production in 2014 15 .