An analysis of cocoa (Theobroma cacao L.); yield and its components
Two cocoa trials involving twenty-five progenies in Trial-1 and sixteen progenies in Trial 2, were grown under inland conditions in Peninsular Malaysia. Results of a factorial analysis with respect to yield for both trials over 1979-87, including yield components of bean weight, bean number and pod weight over four seasons between 1984-85 are presented. Yield, expressed as both pod production per tree and kg dry bean (kdb) production per ha, showed significant differences among progenies for both trials. However seasonal influence seemed more pronounced than progeny effect for pod production for both trials. The reverse was the case for kdb production per ha. Progeny x seasonal interaction was non-significant for both trials and for both yield expressions. Heritability (h2w) was 93 per cent for pod production and 88 per cent for kdb production for Trial 1. A factorial analysis of pod weight, bean weight and bean number were carried out for five random progenies from Trial 1, and five from Trial 2 where UIT 1 was the common female parent. For the first trial, significant differences were noted for bean weight and bean number while the second did not. Bean weight was significantly influenced by season but pod weight was not. Bean and pod weight showed no significant interaction with season. Heritability estimates (h2w) was 5 per cent for pod weight, 94 per cent for bean weight and 55 per cent for bean number. Significant correlations for pod weight with bean weight and pod weight with bean number were obtained. Bean number with bean weight generally showed no correlation for the various progenies and individual genotypes analysed.
| Main Authors: | , |
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| Format: | biblioteca |
| Published: |
Oct
|
| Subjects: | THEOBROMA CACAO, RENDIMIENTO, PRUEBAS DE DESCENDENCIA, FACTORES DEL RENDIMIENTO, MALASIA, |
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| Summary: | Two cocoa trials involving twenty-five progenies in Trial-1 and sixteen progenies in Trial 2, were grown under inland conditions in Peninsular Malaysia. Results of a factorial analysis with respect to yield for both trials over 1979-87, including yield components of bean weight, bean number and pod weight over four seasons between 1984-85 are presented. Yield, expressed as both pod production per tree and kg dry bean (kdb) production per ha, showed significant differences among progenies for both trials. However seasonal influence seemed more pronounced than progeny effect for pod production for both trials. The reverse was the case for kdb production per ha. Progeny x seasonal interaction was non-significant for both trials and for both yield expressions. Heritability (h2w) was 93 per cent for pod production and 88 per cent for kdb production for Trial 1. A factorial analysis of pod weight, bean weight and bean number were carried out for five random progenies from Trial 1, and five from Trial 2 where UIT 1 was the common female parent. For the first trial, significant differences were noted for bean weight and bean number while the second did not. Bean weight was significantly influenced by season but pod weight was not. Bean and pod weight showed no significant interaction with season. Heritability estimates (h2w) was 5 per cent for pod weight, 94 per cent for bean weight and 55 per cent for bean number. Significant correlations for pod weight with bean weight and pod weight with bean number were obtained. Bean number with bean weight generally showed no correlation for the various progenies and individual genotypes analysed. |
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