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Nitrogen Uptake of Field-grown Cotton. II. Nitrate Reductase Activity and Petiole Nitrate Concentration as Indicators of Plant Nitrogen Status

Published online by Cambridge University Press:  03 October 2008

D. M. Oosterhuis  and
G. C. Bate
D. M. Oosterhuis
Affiliation:
Cotton Research Institute, PO Box 530, Gatooma, Zimbabwe
G. C. Bate
Affiliation:
Cotton Research Institute, PO Box 530, Gatooma, Zimbabwe
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Summary

The possibility of using seasonal changes in leaf nitrate reductase activity (NRA) as a reliable and sensitive indicator of plant nitrogen (N) status has been investigated in field-grown cotton. These changes were compared with those in nitrate concentration in petioles and variations in soil-N concentration. We conclude that NRA in the uppermost, fully-expanded sympodial leaves may provide a more convenient, sensitive and reliable indicator of plant-N status than measurements of nitrate concentrations in petioles.

Type
Research Article
Information
Experimental Agriculture , Volume 19 , Issue 1 , January 1983 , pp. 103 - 109
Copyright
Copyright © Cambridge University Press 1983

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References

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