Choice of selection environment for root yield in sweetpotato [Ipomoea batatas (L.) Lam]
1996
Nguyen Thanh Binh
Combined analyses of variances over three environments showed that genotype x environment interactions were present and highly significant for all characters. However, the fact that some clones performed well in environments indicated that stable genotypes can be found in sweetpotato. Results of the evaluation of all selections in all environments revealed that sandy soil was better than clay soil while highland was better than lowland in differentiating sweetpotato genotypes for root yield. However, the environments/areas used in the study differed in many factors and not only in the one of interest (soil type or temperature level), these results just indicated that a high stress environment (sandy soil and highland in this study) could better discriminate sweetpotato genotypes for root yield than a low stress environment (clay soil and lowland) and have not really answered the question of which soil type or which elevation is a better selection environment
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