Ammonia volatilization after injection of anhydrous ammonia into arable soils of different moisture levels |
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Authors: | S G Sommer B T Christensen |
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Institution: | (1) Askov Experimental Station, Vejenvej 55, DK-6600 Vejen, Denmark |
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Abstract: | Laboratory experiments have shown appreciable losses of ammonia after injection of anhydrous ammonia into dry and wet soils.
In this study losses of ammonia injected into a moist (tension 10 kPa), dry (tension 160 kPa) and a wet (tension 1.6 kPa)
sandy loam were measured under field conditions using wind tunnels. Losses were insignificant from a moist soil. However losses
from a dry and a wet soil were 20% and 50% of injected ammonia, respectively. From the dry soil, losses of gaseous ammonia
took place within the first hours after injection, which indicates a rapid transport through cracks and voids. From the wet
soil, 20% of the injected ammonia was lost more gradually between 6 h and 6 d. This indicates that upward movement of water
due to evaporation may be the cause of these ammonia losses which proceeded for longer periods. |
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Keywords: | ammonia volatilization anhydrous ammonia sandy loam soil water content wind tunnels |
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