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Volatilization of ammonia from solid and liquid urea surface-applied to perennial ryegrass

Published online by Cambridge University Press:  27 March 2009

C. J. Watson ,
R. J. Stevens ,
R. J. Laughlin  and
P. Poland
C. J. Watson
Affiliation:
Food and Agricultural Chemistry Research Division, Department of Agriculture for Northern Ireland, Newforge Lane, Belfast BT9 5PX, UK
R. J. Stevens
Affiliation:
Food and Agricultural Chemistry Research Division, Department of Agriculture for Northern Ireland, Newforge Lane, Belfast BT9 5PX, UK
R. J. Laughlin
Affiliation:
Food and Agricultural Chemistry Research Division, Department of Agriculture for Northern Ireland, Newforge Lane, Belfast BT9 5PX, UK
P. Poland
Affiliation:
Food and Agricultural Chemistry Research Division, Department of Agriculture for Northern Ireland, Newforge Lane, Belfast BT9 5PX, UK
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Summary

A field experiment compared the effects of urea, surface-applied either as a solid or liquid, at a rate of 100 kg N/ha, on ammonia volatilization from an established perennial ryegrass sward on three separate occasions during 1990 at the Agricultural Research Institute, Hillsborough, Northern Ireland. Total NH3 loss over 10 days from prilled urea for each of the three study periods was equivalent to 3.4, 9.1 and 4.4% of N applied. On two occasions, applying urea as a liquid significantly increased NH3 loss compared to prills, whereas on the third occasion there was no significant effect. Increasing the spray volume from 80 to 640 ml/m2 had no significant effect on NH3 volatilization.

Surface application of urea as a liquid compared to the prilled form did not lower NH3 volatilization and therefore is not a strategy that would improve the efficiency of urea as a nitrogen source for temperate grassland.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 119 , Issue 2 , October 1992 , pp. 223 - 226
Copyright
Copyright © Cambridge University Press 1992

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