Seven hybrid true potato seed (TPS) families received from the International Potato Center,
Lima, Peru were evaluated and compared with HPS 11167 and HPS 7167 during 2001 to 2003
to see the performance of hybrid TPS families for seedling tuber p_roduction in di.fferellt agroecological
zones of Nepal. The families were tested in randomized complete block design
(RCBD) with four replications. Tuber yield produced by MF II x IPS 67 (5.12 kg/m2
) and
Atzimba x TPS 67 (3.15 kg!nl) at Khumaltar and Lumle, respectively were respectively
higher than other tested families. In Pakhribas, Surkhet and Taralu:;ra maximum tuber
weights were obtainedfromMF II x TPS 67 (3.94 kg/m2
), Serranax TPS 13 (2.24 kg!nl) and
HPS 11167 (6.20 kglm2
). Atzimba x TPS 67 produced significalltly maximum tuber number at
Khumaltar (496.47/nh Lumle (400.85/m2
) and Pakftribas conditions (349.01/m2
), whereas
in Surkhet and Tarahara, maximum tuber number were recorded in Serrana x TPS 13
(352.05/m2
) and HPS 11167 (723.67/m2
), "respectively. The average tuber weight among the
families were statistically significant, Maximum average tuber weights were recorded in LT 8
x TPS 13 in all the locations. None of the families were resistant/tolerance to late blight
(Phytophhora infestans) disease at Lumle. Based on overall performance, TPS families MF II
x TPS 67, Atzimba x TPS 67, MF II TPS 67 and HPS 7167, Serrano x TPS 13, MF II x TPS 67
and HPS 11167 were found promising for seedling tuber production in Lumle, Pakhribas,
Surkhet and Tarahara conditions, respectively.

Seven hybrid true potato seed (TPS) families received from the International Potato Center,
Lima, Peru were evaluated and compared with HPS 11167 and HPS 7167 during 2001 to 2003
to see the performance of hybrid TPS families for seedling tuber p_roduction in di.fferellt agroecological
zones of Nepal. The families were tested in randomized complete block design
(RCBD) with four replications. Tuber yield produced by MF II x IPS 67 (5.12 kg/m2
) and
Atzimba x TPS 67 (3.15 kg!nl) at Khumaltar and Lumle, respectively were respectively
higher than other tested families. In Pakhribas, Surkhet and Taralu:;ra maximum tuber
weights were obtainedfromMF II x TPS 67 (3.94 kg/m2
), Serranax TPS 13 (2.24 kg!nl) and
HPS 11167 (6.20 kglm2
). Atzimba x TPS 67 produced significalltly maximum tuber number at
Khumaltar (496.47/nh Lumle (400.85/m2
) and Pakftribas conditions (349.01/m2
), whereas
in Surkhet and Tarahara, maximum tuber number were recorded in Serrana x TPS 13
(352.05/m2
) and HPS 11167 (723.67/m2
), "respectively. The average tuber weight among the
families were statistically significant, Maximum average tuber weights were recorded in LT 8
x TPS 13 in all the locations. None of the families were resistant/tolerance to late blight
(Phytophhora infestans) disease at Lumle. Based on overall performance, TPS families MF II
x TPS 67, Atzimba x TPS 67, MF II TPS 67 and HPS 7167, Serrano x TPS 13, MF II x TPS 67
and HPS 11167 were found promising for seedling tuber production in Lumle, Pakhribas,
Surkhet and Tarahara conditions, respectively.