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Science 18 February 1972:
Vol. 175. no. 4023, pp. 771 - 772
DOI: 10.1126/science.175.4023.771
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Articles

Atmospheric Ammonia: Absorption by Plant Leaves

G. L. Hutchinson 1, R. J. Millington 2, and D. B. Peters 3

1 Soil and Water Conservation Research Division, Agricultural Research Service, Post Office Box E, Fort Collins, Colorado 80521
2 Commonwealth Scientific and Industrial Research Organization, Division of Land Resources, Box 109, Canberra City, Australian Capital Territory 2601
3 Soil and Water Conservation Research Division, Agricultural Research Service, S-212 Turner Hall, University of Illinois, Urbana 61801

By monitoring the disappearance of ammonia from an airstream flowing through a small growth chamber containing a single plant seedling, it was discovered that plant leaves absorb significant quantities of ammonia from the air, even at naturally occurring low atmospheric concentrations. The measured absorption rates of ammonia showed large diurnal fluctuations and varied somewhat among species, but differed little with the nitrogen fertility level of plants within a species.


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