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Foliar Absorption of Atmospheric Ammonia by Ryegrass in the Field

Askov Experimental Station, Vejenvej 55, DK-6600 Vejen, Denmark (formerly National Environmental Research Institute, Division of Terrestial Ecology, Vejsøovej 11, 8600 Silkeborg, Denmark);

E. S. Jensen

Agricultural Research Department, Risø National Laboratory, DK-4000 Roskilde.

^* Corresponding author.

ABSTRACT

The dry deposition of ammonia (NH₃) in the field was measured simultaneously at increasing distances from a point source (a dairy farm) using a biomonitor. The biomonitor was Italian ryegrass (Lolium multiflorum Lam) grown in pots and supplied with ¹⁵N-labeled N. The use of ¹⁵N improved the precision and lowered the detection limit of the method compared with calculating the NH₃ deposition using the difference method (N-balance method). Atmospheric NH₃-concentrations were measured by drawing air through traps containing sulfuric acid. At the end of a 6-wk period in the growing season, the deposition of N was 3.0 g N/m² and 0.7 g N/m² at average atmospheric concentrations of 89 and 6 µg NH₃-N/m³, respectively. Estimated deposition velocities ranged from 0.7 to 3.4 cm/s with an average of 1.6 cm/s (s.d. 1.2 cm/s).