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Published in Soil Sci Soc Am J 32:698-704 (1968)
© 1968 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Nitrate-Stimulated Uptake and Transport of Strontium and Other Cations1

W. A. Jackson and Doris Craig Williams2,3,

ABSTRACT

Supplying nitrate to N-depleted wheat seedlings (Triticum vulgare, var. Atlas 66) stimulated the uptake of both divalent (Sr, Mn, and Mg) and monovalent (Cs, Na, K) cations. Rapid nitrate uptake, and the lower ambient acidity resulting from it, appeared to be partially responsible for the increase in cation uptake. Nevertheless, pretreatments with nitrate exerted some stimulation in Sr and Cs uptake, indicating an additional action of nitrate after it had entered the tissues. Pretreatment with nitrate, as well as its presence during the Sr uptake period, increased transport of Sr to the shoots more than total uptake. Transport to shoots of previously absorbed Sr was enhanced by subsequent nitrate treatments, the amount transported being significantly greater with nitrate salts of Ca, Mg, and Na than with K or NH4.

NOTES

1 Paper no. 2552 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, Grant No. AT-(40-1)-2410.

2 Professor and former Assistant Professor. Department of Soil Science, North Carolina State University, Raleigh.

3 We should like to thank Mrs. Ann G. Matrone for the results shown in Table 2, for many calculations, and for producing the figures.

Received for publication February 20, 1968. Accepted for publication May 24, 1968.






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