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This article in SSSAJ

  1. Vol. 32 No. 5, p. 692-698
     
    Received: Mar 15, 1968
    Published: Sept, 1968


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doi:10.2136/sssaj1968.03615995003200050032x

Nitrate Uptake and Reduction as Affected by Calcium and Potassium1

  1. P. L. Minotti,
  2. Doris Craig Williams and
  3. W. A. Jackson2

Abstract

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.

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