ISHS Acta Horticulturae 395: Dormancy and the related Problems of Deciduous Fruit Trees
STUDIES OF CHILLING REQUIREMENT ON SIX PEACH CULTIVARS IN THE PO VALLEY (1990–1994) |
| Author: | G.A. Finetto |
| Keywords: | Bud burst, Chilling requirement (c.r.), Chilling hour (c.h.), Chilling unit (c.u.), Endo-dormancy, D40 |
| Abstract:
Our knowledge of the chilling requirements for temperate fruits is still limited. In particular, the mid and high chilling cultivars have different responses when they are grown in tropical conditions. In order to improve the subject, six mid and high chilling peach cultivars on GF 677 rootstock, planted in 1982, were investigated. During the winter for four years, 30 shoots were taken from each cultivar weekly, placed in glasses with water and put in the growth chamber for 20 days at 22°C. The opened buds were counted. The temperature during the winters were recorded and modeled using Richardson and Crossa-Raynaud formulae. The data showed that in some cultivars the same percentage of bud burst takes place at different chilling units and chilling hours. The prediction of bud burst seems to be more closely related to the chronological timing than to the amount of chilling. We may conclude that in the Po valley the formulae used have only an indicative value in estimating the requirement to overcome endo-dormancy in some peach cultivars. | |
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