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Nitrate Uptake and Reduction as Affected by Calcium and Potassium¹

ABSTRACT

Nitrate uptake patterns by nitrogen-depleted wheat seedlings (Triticum vulgare var. Atlas 66) exhibited an initial lag phase which was lessened, but not completely overcome, by presence of solution Ca. Maintenance of a more rapid subsequent rate of nitrate uptake, which developed after the initial lag phase, depended upon presence of solution K. The rapid phase was enhanced when both Ca and K were present and was curtailed by shoot excision and by Ca deficiency. Sizeably larger amounts of nitrate were recovered in the shoots after 24 hours in KNO₃ as compared to Ca(NO₃)₂, and with the former salt, smaller proportions of the absorbed nitrate were reduced. The data suggest a beneficial influence of Ca both on initial nitrate uptake by root tissue and on transport to shoots while a continual K supply was apparently beneficial in nitrate transport.

¹ Paper no. 2587 of the Journal Series of the North Carolina State University Agr. Exp. Sta., Raleigh. These investigations were supported by the U.S. Atomic Energy Commission, Contract No. AT-(40-1)-2410.

² Assistant Professor of Vegetable Crops, Cornell University, Ithaca, New York; former Assistant Professor, and Professor of Soil Science, North Carolina State University, Raleigh.

Received for publication March 15, 1968. Accepted for publication June 4, 1968.