Abstract

Genotype-environment interaction for yield in clusterbean (Cyamopsis tetragonoloba (L) Taub) was studied by growing 10 unbranched genotypes for 3 years during monsoon seasons of 1979-1981. There was a significant variation in respect of geno- type x environmental interactions for seed yield. A large portion of these interactions was accounted for by the linear regression on the environmetal means; although the non-linear component was also significant. The genotype FS 277 was found to be comparatively stable with high mean yield and average response to the changes in invironmental conditions. The genotype HFG-134 had the highest mean yield, and was found especially suitable for unfavourable growing seasons. Thus, the exploitation of these varieties in a breeding programme will help in improving the productivity of the crop.

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