Amelioration de la resistance a la verse du cafeier a l'aide de la theorie de la resistance des materiaux
The tetraploid hybrid between C. canephora and C. arabica called C. arabusta frequently gives rise to lodging. Since the stability of the plant depends on the strenght of materials theory, it is possible to apply this theory to choose the most efficient selection characters. The twisting theory of the stems reveals that the critical force is proportional of the Young's Modulus of the material of which the stem is made and proportional to the square of its section/lenght ratio. A systematic investigation on the Young's Modulus of the green wood has been carried out on the different species C. arabica, C. canephora var. robusta and C.. arabusta. The Young's Modulus was revealed to be a genetic constant characteristic of a coffee clone. The considerable inter and intraspecific variability of this modulus enables to expect and effective selection against lodging. In fact, the Young's Moduli fluctuate between 20 000 kg/cm2 for the strongest. A mathematical model of the coffee growth has been carried out. It integrates all the morphological and dynamical data concerning the growth of a given clone. A simulation on computer enables an accurate analysis of the influence of each parameter on the lodging and the forecasting of the gains which may be obtained through selection
| Main Authors: | , , , |
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| Format: | biblioteca |
| Published: |
París (Francia)
1979
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| Subjects: | COFFEA ARABICA, COFFEA CANEPHORA, SELECCION, VUELCO, TALLO, ANATOMIA DE LA PLANTA, ARABUSTA, |
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| Summary: | The tetraploid hybrid between C. canephora and C. arabica called C. arabusta frequently gives rise to lodging. Since the stability of the plant depends on the strenght of materials theory, it is possible to apply this theory to choose the most efficient selection characters. The twisting theory of the stems reveals that the critical force is proportional of the Young's Modulus of the material of which the stem is made and proportional to the square of its section/lenght ratio. A systematic investigation on the Young's Modulus of the green wood has been carried out on the different species C. arabica, C. canephora var. robusta and C.. arabusta. The Young's Modulus was revealed to be a genetic constant characteristic of a coffee clone. The considerable inter and intraspecific variability of this modulus enables to expect and effective selection against lodging. In fact, the Young's Moduli fluctuate between 20 000 kg/cm2 for the strongest. A mathematical model of the coffee growth has been carried out. It integrates all the morphological and dynamical data concerning the growth of a given clone. A simulation on computer enables an accurate analysis of the influence of each parameter on the lodging and the forecasting of the gains which may be obtained through selection |
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