Seasonal changes and the effect of nitrogen‐ and potash‐fertilization on the solanine and α‐chaconine content in various parts of the potato plant

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Abstract
The concentration of solanine and α‐chaconine in leaves and tubers decreased with the progress of the potato plant towards maturity. In stems an increase of these alcaloids up to the first part of the second stage of the vegetation period could be observed.With a higher level of nitrogen the concentration of both glycoalcaloids in leaves and stems increased, while in tubers a depression of the glycoalcaloid content was estimated.An increased level of potassium did not change markedly the concentration of glycoalcaloids in leaves and stems of the potato plant but decreased both alcaloids in the tuber.
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