Average chemical composition of mature tubers of 97 Polish potato table cultivars is
presented. Each variety was cultivated for at least 3 years at the Experimental Station in
Jadwisin, near Warsaw. About 25 cultivars were grown each year between 1974 and 1997 on
light loamy sand with the same agricultural practices, without irrigation or chemical control
of diseases.
Contents of dry matter and starch were the most stable with mean variability coefficients (V)
8.4 and 8.8%, respectively. The least stable components were concentrations of total sugar
(V=34.2%) and reducing sugar with V reaching about fifty percent. Wet vegetation conditions
worsened tuber chemical composition (less dry matter, starch, protein and ascorbic acid) as
compared with dry or intermediate ones.