Improving precision of cocoa progeny trials using calibrator trees
In nine breeding trials with cocoa in Ghana the experimental trees were interplanted with temporary trees of a standard variety as "calibrators". The calibrators were removed after 2-2 1/2 years before there was strong competition with the permanent trees. Trunk diameters of the calibrators were used as covariates in analyses of trunk size and yield of dry cocoa up to 7 years after planting, giving reductions in standard errors of differences between progenies of up to 25 per cent in analyses of size and 15 per cent in analyses of yield
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| Format: | biblioteca |
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1979
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| Subjects: | PROGENIE, THEOBROMA CACAO, FITOMEJORAMIENTO, ARBOLES CALIBRADORES, RENDIMIENTO, DIAMETRO DEL TALLO, GHANA, |
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| Summary: | In nine breeding trials with cocoa in Ghana the experimental trees were interplanted with temporary trees of a standard variety as "calibrators". The calibrators were removed after 2-2 1/2 years before there was strong competition with the permanent trees. Trunk diameters of the calibrators were used as covariates in analyses of trunk size and yield of dry cocoa up to 7 years after planting, giving reductions in standard errors of differences between progenies of up to 25 per cent in analyses of size and 15 per cent in analyses of yield |
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