Effect of Phosphorus Nutrition and Soil pH on “Physiologic Spotting” of L8 Burley Tobacco
1973
Lowe, R. H. | Bortner, C. E.
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.
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