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Foliar Absorption of Atmospheric Ammonia by Ryegrass in the Field
Author(s) -
Sommer S. G.,
Jensen E. S.
Publication year - 1991
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1991.00472425002000010024x
Subject(s) - lolium multiflorum , deposition (geology) , ammonia , chemistry , sulfuric acid , atmospheric pollution , absorption (acoustics) , detection limit , environmental chemistry , zoology , analytical chemistry (journal) , pollution , agronomy , materials science , chromatography , inorganic chemistry , ecology , biology , paleontology , organic chemistry , sediment , composite material
The dry deposition of ammonia (NH 3 ) 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 15 N‐labeled N. The use of 15 N improved the precision and lowered the detection limit of the method compared with calculating the NH 3 deposition using the difference method (N‐balance method). Atmospheric NH 3 ‐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/m 2 and 0.7 g N/m 2 at average atmospheric concentrations of 89 and 6 µ g NH 3 ‐N/m 3 , 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).