One hundred ninety five potato germplasm accessions including five varieties were evaluated for tuber yield and its components during three consecutive crop seasons and data were analyzed for stability. Average tuber weight was found more stable than tuber yield and tuber number. Stable accessions were not necessarily high yielding too. Accessions namely CP1172, CP1231, CP1233, CP1304, CP1329, CP1338, CP1367, CP1441, CP1442, CP1456, CP1515, CP1555 and Kufri Pukhraj were found to be ideally adapted to North-central plains for total tuber yield and marketable tuber yield owing to significant high mean, non-significant unit regression (bi) and least deviation from regression (S2di). Among these, CP1329 and CP1515 were stable for the maximum of four characters and could be valuable material for adaptability and yield improvement in potato. The accessions namely CP659, CP1057, CP1086, CP1143, CP1181, CP1310, CP1314, CP1316, CP1330, CP1353, CP1358, CP1373, CP1483, CP1485, CP1546, CP1548, CP1591, CP1615, CP1619, Kufri Anand and Kufri Ashoka were responsive to favourable years for total tuber yield and marketable tuber yield. Accessions responsive to unfavourable years possessed low or average mean performance for various characters.
Stability analysis, potato, Solanum tuberosum
