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Published online 1 January 1970
Published in Agron J 62:91-92 (1970)
© 1970 American Society of Agronomy
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Effect of Phosphorus on Nitrate in Sugar Beet (Beta vulgaris L.)

F. J. Hills, R. L. Sailsbery, Albert Ulrich and K. M. Sipitanos2

Culture-solution and field experiments indicate that P-deficient sugar beets, particularly young plants, do not take up nitrate as well as plants adequately supplied with P. The increase in concentration of NO3-N in whole tops of young seedlings, cotyledons, or petioles of first true leaves with increased P supply is greater than can be accounted for by a concomitant decrease in percent dry-matter of these plant parts. The decreased absorption of NO3 by P-deficient plants in aerated culture-solution, with all roots exposed continuously to high concentrations of NO3 indicates that the phenomenon reflects not merely increased root extension but a physiological aberration brought about by P-deficiency.

Key Words: PO4-NO3 interaction • Plant analysis

2 Extension Agronomist, Department of Agronomy, University of California, Davis; Farm Advisor, Glenn County, California; Plant Physiologist, Department of Soils and Plant Nutrition, University of California, Berkeley; and Instructor of Agricultural Chemistry, University of Thessaloniki, Greece.

Received for publication July 17, 1969.




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Copyright © 1970 by the American Society of Agronomy.