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| Author: | R. BERNHARD |
Abstract:
Rootstock selection cannot only solve problems of soil adaptation and size of trees, but influence productivity and fruit quality of the variety.
- Mechanism of invigorating rootstock effect is exposed.
- Many years of rootstock breeding show to us that, independantly of the level of size induced, some rootstock increase the productivity (productivity index) of buded trees.
- Possible explanations is proposed on experimental basis :
- These rootstocks induce a relatively slow growing rythm in early spring.
- This slow growing rythm induce more axial flower buds formation on basal part of annual twigs.
- This axial flower bud formation induce a better repartition of fruits all along twigs and this good repartition increase the productivity of the tree.
- Possibility to use early criterion of selection in rootstock breeding is discussed.
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