STABILITY OF TUBER YIELDS OF POTATO GENOTYPES (Solanum tuberosum L.)

The objective of this study was to determine the stability of experimental potato genotypes in four villages of La Encanada District, province and department of Cajamarca. During the 2005-2006, 2006-2007, 2007-2008 and 2012-2013 campaigns, performance trials were evaluated in six contrasting environments. The genetic material consisted of six experimental genotypes from the Banos del Inca Experimental Station-INIA Cajamarca. The experimental design used was complete blocks at random with three repetitions. The experimental plots consisted of four rows of 3.0 m long, separated at 1.00 m. The combined analysis of variance proposed by Eberhart. Russell (1966), revealed statistical significance (P <= 0.01) between environments, genotype and for the interaction genotype x environment (localities). The parameters of stability and adaptability identified the genotypes CAJ010.4 and CAJ004.4, as promising cultivars in favorable and inconsistent environments, with yields of 31.36 and 26.57 t.ha(-1). They were identified as the best environments for yield to the towns of Santa Clotilde and Chaquilpampa, for the values of their positive environmental indices and yields of 38.72 t.ha(-1) and 28.03 t.ha(-1), higher than the general average.