Stability of Cassava Promising Clones Based on Additive Main Effect and Multiplicative Interaction (AMMI) Model

The aim of the study was to know the productivity and stability of cassava promising clones. The experiments were done in nine environments in Pati, Probolinggo, Malang, Lampung Timur, Lampung Tengah and Lampung Selatan from 2010 to 2012. The experiments were arranged in a randomized complete block design, three replications. The plot size was a 5 m × 5 m. Plants distance was 100 cm × 80 cm. Dosage of fertilizers was 93 kg · ha–1 N + 36 kg · ha–1 P2O5 + 60 kg · ha–1 K2O. A total of nine clones were used. Parameter recorded was fresh tuber yield of seven months old plants. IRRISTAT program was used to analyze the variance based on AMMI model, IPCA score and IPCA biplot. The study showed that Clone BIC 180, BIC 556, BIC 280, CMM 03001-10, and BIC 499 were more stable than CMM 02048-6, CMM 03020-2, CMM 03013-11, and UJ3 based on AMMI models. Mean of fresh tuber yield in seven months of CMM 03001-10 over locations and years was the highest (31.75 t · ha–1), 11% higher than UJ3, equal to Rp2 377 500 ha–1, if the price of cassava tuber Rp750.