Phenotypic stability of some cultivars for tuber yield of potato (Solanum tuberosum L.)

Abstract

Seven potato cultivars were evaluated for the stability for total and marketable tuber yield during rabi seasons of 2014-15 to 2016-17. The experiment was laid out in randomised block design in four replications. Genotype x Environment (G x E) interaction was significant for both the characters. Non-linear component was predominant in G x E interaction for both the characters. The cultivar Kufri Pukhraj had the highest phenotypic index, ‘bi’ value less than one and non significant S2di for total tuber yield suggesting its adaptability to poor environment, while for marketable tuber yield S2di was significant which make it unstable. The cultivar Kufri Khyati showed above average performance with ‘bi’ value more than one and non significant S2di for both total and marketable tuber yield suggesting its adaptability to favourable environment only. The high yielding varieties Kufri Badshah and Kufri Pushkar had non significant ‘bi’ values but the presence of significant deviation from regression renders them unstable for both total and marketable tuber yield.