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- Title
The Uptake of Nitrate by Lolium perenne from Flowing Nutrient Solution.
- Authors
CLEMENT, C. R.; HOPPER, M. J.; JONES, L. H. P.; LEAFE, E. L.
- Abstract
Experiments with simulated swards of perennial ryegrass ( L.) grown in flowing nutrient solution with NO- held at 0.1 mg N I show that the rate of NO- uptake was related to diurnal, day-to-day, and seasonal changes in radiation. In summer the diurnal variation in NO-uptake ranged from 25 to 50 mg N m h and the day-to-day variation ranged from 500 to 1500 mg N m d. Mean daily rates of uptake over 12 d periods in summer and in winter averaged 908 and 44 mg N m, respectively. The pattern of NO- uptake followed that of CO flux with the maximum rate of the former occurring 5 or 6 h after the maximum CO influx. After defoliation, NO- uptake was severely curtailed for 2 d concomitant with a very small influx of CO. Analysis of the changes that occurred in the rate of NO- uptake immediately after the switching on or off of artificial light suggests that two reversible processes may be involved in the relation between NO-uptake and radiation, one with a longer and the other with a shorter time constant.
- Publication
Journal of Experimental Botany, 1978, Vol 29, Issue 5, p1173
- ISSN
0022-0957
- Publication type
Article