Genotype-environment interaction and stability analysis in cassava (Manihot esculenta Crantz)
1993
Sarakan, S.
The combined analysis of variance in most cases showed highly significant genotype x year x location interaction indicating that genotype performance were not the same under different environments. On the basis of stability parameters, regression coefficients and deviation from regression, several of the genotypes tested within the period were found to be stable for three parameters of yield i.e., fresh root yield, starch yield and dry matter yield. However, only two cassava genotypes, i.e. CMR 27-27-3 and CMR 25-33-105 were most desirable. Both genotypes were suited for short duration cropping (8 month harvest). Under unfavorable environmental, CMR 27-27-3 appeared to perform better especially during longer crop duration period (12 months). Another genotype, CMR 25-105-112 was noted having high fresh root yield across environments but its dry matter and starch yield expression were unstable. In cassava variety improvement work where starch yield potential is the emphasis, progress can be made if selection for starch content in fresh roots is done as this character show high correlation with the former parameter. In practice, this can be easily assessed using measurement of specific gravity of the fresh roots
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