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Ammonia Exchange Over a Corn Crop¹

ABSTRACT

A micrometeorological technique was used to calculate the net transfer of NH₃ between a corn crop and the atmosphere. On the 10 days of measurement, there was continual interchange of NH₃ between crop and atmosphere with a strong indication of a diurnal cycle. Ammonia absorption by the plant-soil system (downward transfer of NH₃) predominated when the soil surface was dry, but sustained losses of NH₃ (upward transfer) occurred when it was moist. Net absorption rates of 6.6 g N ha^–1 hour^–1 were calculated in the former period, and net losses of as much as 27.6 g N ha^–1 hour^–1 in the latter.

¹ Contribution from Dept. Land Res. Sci., Univ. of Guelph, Ontario, Canada, and CSIRO, Australia.

² Senior Principal Research Scientist, CSIRO Division of Environ. Mech., P.O. Box 821, Canberra City, A.C.T. 2601, Australia, and Graduate Student and Professor in Agrometeorology, Dept. Land Res. Sci., Univ. of Guelph.

Received for publication November 14, 1977. Accepted for publication May 24, 1978.

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