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Nitrogen uptake by wheat seedlings, interactive effects of four nitrogen sources: NO3-, NO2-, NH4+, and ureaThe net influx (uptake) rates of NO3-, NH4+, NO2-, and urea into roots of wheat (Triticum aestivum cv Yecora Rojo) seedlings from complete nutrient solutions containing all four compounds were monitored simultaneously. Although urea uptake was too slow to monitor, its presence had major inhibitory effects on the uptake of each of the other compounds. Rates of NO3-, NH4+, and NO2- uptake depended in a complex fashion on the concentration of all four N compounds. Equations were developed which describe the uptake rates of each of the compounds, and of total N, as functions of concentrations of all N sources. Contour plots of the results show the interactions over the range of concentrations employed. The coefficients of these equations provide quantitative values for evaluating primary and interactive effects of each compound on N uptake.
Document ID
20040090137
Document Type
Reprint (Version printed in journal)
Authors
Criddle, R. S. (University of California Davis 95616, United States)
Ward, M. R.
Huffaker, R. C.
Date Acquired
August 21, 2013
Publication Date
January 1, 1988
Publication Information
Publication: Plant physiology
Volume: 86
ISSN: 0032-0889
Subject Category
Man/System Technology and Life Support
Funding Number(s)
CONTRACT_GRANT: NCC2-99
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Number 61-10
NASA Discipline Life Support Systems
Non-NASA Center
NASA Program CELSS