Genotype, environment and their interactive effects on yield and sugar of sugarcane regional trials.

The yield and sugar of 14 varieties from 5 sites of the Yunnan regional trials in 2004-2006(2 years of planting and 1 year of ratoon crops) were analyzed using additive main effects multiplicative interaction(AMMI) model and its biplot,stability of varieties parameters(represented by Di),mean yield and sugar and their Di values.The results of genotype and environment interaction(G×E) showed that(i) Some varieties had the significant effects and good stabilities,such as YR99-113,DZ93-94 based on the interaction between cane yield and environment;and some varieties had the little effects and good stabilities,such as YR99-113,YZ98-236,based on the interaction between sugar and environment;(ii) The adaptabilities of the varieties for trail regions were indicated by analysis of biplot of AMMI model;(iii) The varieties were hierarchically clustered into 5 types based on the mean yield and sugar and their Di value.The analysis based on AMMI and hierarchical clustering should be good contribution to new sugarcane varieties in appropriate regions.