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It was not known whether day-length had any effect on fruitfulness of grape-vines, and this paper reports results of a series of experiments done to provide some information.
Plants of the variety Muscat Gordo Blanco were grown in growth cabinets and the fruitfulness of new formed buds determined after growth for 13 weeks.
It was found fruitfulness of new bud depended on the daily duration of high-intensity light, but not on low intensity light nor on length of uninterrupted dark periods.
Fruitfulness in Grapevines: Effect of Daylength
1969, Sonderdruck aus der Zeitschrift ‘Vitis’, vol 8, pages 188 – 190
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