Premium
Ammonia Exchange Over a Corn Crop
Author(s) -
Denmead O. T.,
Nulsen R.,
Thurtell G. W.
Publication year - 1978
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1978.03615995004200050039x
Subject(s) - crop , atmosphere (unit) , environmental science , absorption (acoustics) , ammonia , agronomy , zoology , chemistry , meteorology , biology , materials science , physics , organic chemistry , composite material
A micrometeorological technique was used to calculate the net transfer of NH 3 between a corn crop and the atmosphere. On the 10 days of measurement, there was continual interchange of NH 3 between crop and atmosphere with a strong indication of a diurnal cycle. Ammonia absorption by the plant‐soil system (downward transfer of NH 3 ) predominated when the soil surface was dry, but sustained losses of NH 3 (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.