Evaluation of cassava (Manihot esculenta Cranzt.) genotypes for resistance to mite and yield stability through AMMI analysis

The experiments were done during 2015 to 2018 in eight environments considering climate and soil chemistry factors. The evaluation of genotypes was carried out in early root bulking cassava to identify the promising ones for tuber yield stability based on Additive Effects and Multiplicative Interaction (AMMI () biplot analysis. Results showed that genotypes, CMR 51-61-1, CMR 51-48-17, CMR 51-48-16, OMR 51-20-5, OMM0806 - 57, UJ3 and UJ5 were most stable as compared to CMR 51-07-13 and CMR 51-06-16. The important environmental factors affecting yield stability of cassava promising genotypes based on tuber yield in seven months crop duration were N and P₂O₅ contents and pH on topsoil. Mean fresh tuber yield of OMR 51-20-5 was 25% significantly higher than UJ3 and the increasing value was equal to US $ 745/ha while of OMR 51-20-5, it was 15% higher than UJ5 and the increasing value was equal to US $ 482/ha. The genotype, OMR 51-20-5 has been released recently in 2020 as VAMAS 1 by the Indonesian Government.