Abstract
Majestic potatoes sprouted in the dark at 20°C developed necrotic lesions in the elongating region of the sprout, about 3 to 5 mm below the apex. The name sub-apical necrosis is proposed to describe this condition. It was shown to be due to calcium deficiency and was fully controlled by frequent application of 0.01M calcium sulphate solution to the tips of the sprouts. The influence of several other factors was also studied. Calcium was necessary to maintain apical dominance of the sprout and prevent some of the changes which have been attributed to physiological ageing.
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