Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 March 1973
Published in Agron J 65:263-265 (1973)
© 1973 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Phosphorus Nutrition and Soil pH on "Physiologic Spotting" of L8 Burley Tobacco1

R. H. Lowe and C. E. Bortner2

The physiological spotting factor of the black shank resistant variety of burley tobacco, ‘L8,’ (Nicotiana tabacum L.) is related to phosphorus nutrition, and the disorder is accentuated by a low soil pH. This variety accumulated approximately the same amount of phosphorus as two other varieties (‘Burley 21’ and ‘Experimental 4’) with which it was compared but apparently has a malfunction in its phosphorus metabolizing system. Reciprocal grafts indicate that the disorder is associated with the aboveground portion of the plant. Raising either soil pH or soil phosphorus content partially eliminated the spotting. The spotting was completely eliminated, however, only when both soil phosphorus content and pH were high.

Key Words: Aluminum • Black shank • Reciprocal grafts

1 The investigation reported in this paper is in connection with a cooperative project of the Plant Science Research Division, Agricultural Research Service, USDA, and the Kentucky Agricultural Experiment Station and is published with the approval of both agencies (Ky. No. 72-3-58).

2 Plant Physiologist and Research Agronomist, respectively, PSRD, ARS, USDA, Lexington, Ky. 40506.

Received for publication June 19, 1972.




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Environmental Quality		 The Plant Genome
Copyright © 1973 by the American Society of Agronomy.