Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài:"Greenhouse production of nectarines for early harvest in France: a cultivation system with shallow rest or no rest. | 242s Ann. Sci. For. 1989 46 suppl. 242s-245s Forest Tree Physiology E. Dreyer et a . eds. Elsevier INRA Greenhouse production of nectarines for early harvest in France a cultivation system with shallow rest or no rest p. Balandier and R. Rageau Laboratoire de Bioclimatologie INRA Domaine-de-Crouelle 63039 Clermont-Ferrand Cedex France Introduction The greenhouse cultivation system was started in France 5 yr ago. The aim of this system was to supply the market with peaches earlier than the southern European countries do already. Although the current system modified Bellini system has had favorable economic results the environmental conditions were determined empirically and are probably not optimal. The feasibility of heating the greenhouse earlier or increasing the temperature is often questioned but unfortunately there is a lack of basic knowledge about tree physiology especially in experiments such as this one which involves the severe cutting back of the trees in summer. Arias and Crabbe 1975 studying cherry trees Barnola and co-workers 1976 studying hazelnut trees and Dreyer and Mauget 1986 studying walnut trees found that buds on shoots or parts of shoots which started growing as a result of severe summer pruning or water stress never reached a high level of dormancy. Erez 1987 carried out a similar experiment on peach trees grown under forced conditions in Israel but looked more closely at bud development these particular buds seemed to experience a low level of dormancy however this approach was rather indirect. A first study on nectarine trees grown in a greenhouse was carried out by Rageau and Ridray 1989 with the following conclusion no dormancy in the leaf buds and slight dormancy in the flower buds. These conclusions still have to be confirmed especially for the flower buds. Materials and Methods Experiments were carried out with 3 yr old nectarine trees cv Armking grafted onto peach rootstock GF 305 which had been classically trained in containers for
