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Effect of ammonium sulfate, ammonium chloride and root-zone acidity on inorganic ion content of tobaccoTobacco plants (Nicotiana tabacum L. cv NC82) were supplied with (NH4)2SO4 or NH4Cl at root-zone pH of 6.0 and 4.5 in hydroponic culture for 28 days. Dry matter accumulation, total N and C content, and leaf area and number were not affected by the NH4+ source or root-zone pH. Plants supplied with NH4Cl accumulated up to 1.2 mM Cl g DW-1, but accumulated 37% less inorganic H2PO4- and 47% less SO4(2-) than plants supplied with (NH4)2SO4. The large Cl- accumulation resulted in NH4Cl- supplied plants having a 31% higher inorganic anion (NO3-, H2, PO4-, SO4(2-), and Cl-) charge. This higher inorganic anion charge in the NH4Cl-supplied plants was balanced by a similar increase in K+ charge. Plants supplied with NH4Cl accumulated greater concentrations of Cl- in leaves (up to 5.1% of DW) than plants supplied with (NH4)2SO4 (less than -% DW). Despite the high Cl- concentration of leaves in NH4Cl supplied plants, these plants showed no symptoms of Cl- toxicity. This demonstrates that toxicity symptoms are not due solely to an interaction between high Cl- concentration in tissue and NH4+ nutrition. The increase in root-zone acidity to pH 4.5 from 6.0 did not induce toxicity symptoms.
Document ID
20040121787
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Vessey, J. K.
(University of Manitoba Winnipeg, Canada)
Raper, C. D. Jr
Henry, L. T.
Raper CD, J. r.
Date Acquired
August 22, 2013
Publication Date
January 1, 1990
Publication Information
Publication: Journal of plant nutrition
Volume: 13
Issue: 7
ISSN: 0190-4167
Subject Category
Life Sciences (General)
Distribution Limits
Public
Copyright
Other
Keywords
NASA Program CELSS
NASA Discipline Life Support Systems
Non-NASA Center
NASA Discipline Number 61-10

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