Abstract

Sholihin Iletri

An experiment to evaluate the stability of cassava promising varieties for high tuber and ethanol yield using Ammi Model was done during 2007/2008 and 2009 seasons in Lumajang and Banyuwangi (East Java), Lampung Selatan (Lampung), Lampung Timur (Lampung) and Lampung Tengah (Lampung). The experiments were laid down in a RCB Design with three replications. The plot size was a 5 m x 5 m. Plants were spaced 100 cm x 80 cm and fertilizer rates 93 kg N+ 36 kg P2O5 + 60kg K2O/ha were used. The clones tested were CMM 99008-3, OMM 9908-4, OMM 9904-70, CMM 99023-12, OMM 9904-111, CMM 99023-4 and MLG 10311 as promising clones with Adira 4 and UJ5 (released varieties) as checks. Fresh tuber yield (t/ha) of nine months old plants were collected. Based on stability analysis of AMMI model, the study showed that, CMM 99008-3, OMM 9908-4, OMM 9904-70, CMM 99023-4, UJ5, MLG 10311 and Adira 4 were stable clones while CMM 99023-12, OMM 9904- 111, were not. The mean of the fresh tuber yield of OMM 9908-4 over locations and years was the highest (42,223 t/ha), 15 % higher than UJ5 /Kasetsart 50), equal to Rp 4.460.800,-/ha or around US $ 496. The yield potential of ethanol of OMM 9908-4 was 14472 liter/ha.