Differences among potato genotypes in storability at high temperature after different periods of storage*

Ten advance stage hybrids and varteties of potato were stored at ambient temperatures in North-western plains of india. The variances due to genotype, storage period and genotype × storage period interaction were highly significant. Till 45 days of storage all the genotypes were at par in per cent weight loss. At 70 days, JI 5857. Kufri Badshah and Kufri Bahar were at par, but had significantly higher weight loss than that in other genotypes. At 140 days, Kufri Lalima, Kufri Lauvkar and JF 5106 showed better storabillty than all other genotypes. Effect of storage period on weight loss was almost linear. However, weight loss was somewhat slower in the initial pertod of observations. Average weight loss was less than 10 percent and rottage was nil, upto 70 days. After 100 days of storage, rottage was a significant contributor to weight loss. The results indicated that it won't be desirable to store potatoes at room temperature beyond 70 days i.e. about May end. However, for identifying parents for use in breeding programmes, the evaluation must be done for longer periods, as differences in storability widen with the passage of time.