Cyclic Variations in Nitrogen Uptake Rate in Soybean Plants

Uptake of NO3 - by nonnodulated soybean plants (Glycine max L. Merr. cv Ransom) growing in flowing hydroponic culture at 22 and 14°C root temperatures was measured daily during a 31-day growth period. Ion chromatography was used to determine removal of NO3 - from solution during each 24-hour period....

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1985-06, Vol.78 (2), p.320-322
Main Authors: Leslie C. Tolley, Raper, C. David
Format: Article
Language:English
Subjects:
Hydroponics
Leaves
Nitrates
Nitrogen
Nutrient solutions
Plant growth
Plant roots
Plants
Root growth
Soybeans
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Summary:Uptake of NO3 - by nonnodulated soybean plants (Glycine max L. Merr. cv Ransom) growing in flowing hydroponic culture at 22 and 14°C root temperatures was measured daily during a 31-day growth period. Ion chromatography was used to determine removal of NO3 - from solution during each 24-hour period. At both root-zone temperatures, rate of NO3 - uptake per plant oscillated with a periodicity of 3 to 5 days. The rate of NO3 - uptake per plant was consistently lower at 14°C than 22°C. The lower rate of NO3 - uptake at 14°C during the initial 5 to 10 days was caused by reduced uptake rates per gram root dry weight, but with time uptake rates per gram root became equal at 14 and 22°C. Thereafter, the continued reduction in rate of NO3 - uptake per plant at 14°C was attributable to slower root growth.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.78.2.320