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Published in Agron J 62:530-532 (1970)
© 1970 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Nitrate and Ammonium as Sources of Nitrogen for Corn and Their Influence on the Uptake of Other Ions1

Graeme J. Blair, M. H. Miller and W. A. Mitchell2

No yield differences in tops or roots were measured between ammonium and nitrate nitrogen sources in flow ‘United 108’ grown for 14 or 28 days in constant flow culture solution. There was a greater uptake of N from the nitrate source but approximately 25% of the total uptake remained as nitrate within the plant. Higher plant levels of phosphorus and sulphur were measured in the ammonium treatment and higher Ca++ and Mg++ in the nitrate treatment indicating a predominately cation-anion balance effect.

Key Words: Plant composition • Ionic balance

1 Contribution from Department of Soil Science, University of Guelph, Guelph, Ontario, Canada. The financial assistance ot the National Research Council of Canada is gratefully acknowledged.

2 Post-Doctoral Fellow, Professor, and Senior Technician.

Received for publication December 12, 1969.




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Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1970 by the American Society of Agronomy.