Adaptability of recently recommended rubber clones for agro-climatic variability of Sri Lanka

Abstract

Fifteen new Hevea clones which were planted in eight different sites in 1998 were studied to select stable clones for wide range of agro-climatic variability. The analysis of variance indicated the presence of significant genetic, environmental and genotype environment interaction for 5' h year girth measurement. Variance of clones over environments used as the stability index. Mean stability and the mean performance were used to categorized the fifteen clones into four groups with different levels of mean performances and stabilities. The clones RRISL 215 and RRISL 217 were shown to be highly stable over all the environments with high mean performance.