PHENOLOGICAL CHARACTERIZATION OF MENDOZA (ARGENTINA) OLIVE (OLEA EUROPEA L.) GERMPLASM
The phenological characterization of the olive tree for a specific location is needed to improve the crop efficiency and know the adaptation of new cultivars. The aim of this work was to estimate the occurrence of the olive germplasm flowering and maturity in Mendoza province, using a thermal model. During six seasons and using 59 olive accessions, the day of full bloom (80% of the flowers opened around the canopy) and maturity (80% of the fruits at veraison around the canopy) was determined. The length of the phenological stages studied was expressed in thermal time using a model of thermal time and a base temperature = 8.5°C. The average of full bloom and maturity of the olive germplasm collection was 3 November (±9 days) and 28 April (±42 days), respectively. In order to flower, 80% of the accessions required between 420 and 520°C days (counted from 1 August) and the duration of the flowering-maturity stage showed great variability among the accessions, in the range between 1867-2287°C days. The frost risk during flowering was 0.5%, while 37 accessions showed a greater frost risk likelihood of 50% during the maturity of the fruits. The use of the thermal time had reduced the interannual variability in the estimation of the phenological stages by 30% compared to the method of number of days, and gave a better estimation of the development of different olive cultivars.
Trentacoste , E.R. and Puertas, C.M. (2012). PHENOLOGICAL CHARACTERIZATION OF MENDOZA (ARGENTINA) OLIVE (OLEA EUROPEA L.) GERMPLASM . Acta Hortic. 949, 71-75
flowering, maturity, olive accessions, risk frost, thermal time