Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Importance of water consumption for calcium utrition of trees. | 369s Ann. Sci. For. 1989 46 suppl. 369s-371s Forest Tree Physiology E. Dreyer etal. eds. Elsevier INRA Importance of water consumption for calcium nutrition of trees A. Vigouroux1 c. Bussi2 and . Berger1 1 W A Botanique et Pathologie Végétale-ENSA 34060 Montpellier Cedex and 2INRA SRIV Domaine-de-Gotheron 26320 St-Marcel-les-Valence France Introduction Because of the relationship between peach tree susceptibility to a bacterial dieback and the edaphic conditions of the orchards Vigouroux and Huguet 1977 it is necessary to specify the effect of the tree s calcium nutrition on this relationship. An initial profile analysis in acid predisposing soils suggested several factors inducing an inability to provide an adequate water supply that might result in a predisposing effect on the trees to bacterial dieback. Preliminary experiments were then conducted in large weighable containers to confirm and quantify these observations. Results indicated a marked effect of water consumption on tree calcium nutrition Vigouroux etal. 1987 . Unfortunately in these preliminary experiments trees were irrigated with tap water which was found to be calcareous. Thus it was necessary to determine the respective role of water and calcium availability in the variations of the calcium content of the trees. For this purpose a new experiment was undertaken with the same acid soil and the same container culture conditions but using 2 treatments calcareous and demineralized water each applied at 2 levels of irrigation. Limed and natural soils were also compared to estimate the effect of an increase of the availability of calcium in the soil. This paper reports the results. Materials and Methods Peach tree scions Prunus persica L. Batch cv May-Creston GF 305 rootstock were cultivated for 1 yr each one in a 250 I container filled with acid soil. The soil was a pebbly loamy sandy material originating from the 0-30 cm horizon of the old fluvial-glacial RISS terrace of the Rhone valley Bornand .
