INFLUENCE OF NEGATIVE MINIMUM TEMPERATURES AND ABUNDANT PRECIPITATION UPON PRODUCTION AND QUALITY OF SOME VARIETIES OF VINES WITH TABLE GRAPES FROM SANDY SOILS CONDITIONS IN SOUTH-WESTERN OLTENIA
Abstract
During the 2012-2016 period, only one year (2013), has provided favourable conditions for the cultivation of vines on sandy soils from south-western Oltenia. In this year, all varieties studied were manifested at the genetic potential, consistent with vigour the 1st year of production. It was noted the Otilia variety has realized an output of 27.6 tonnes/hectare. It was followed up with an output of more than 20 t/ha of varieties: Muscat de Hamburg Cl. 202 (23.1 t/ha), Napoca (21.6 t/ha), Transilvania (21.4 t/ha), Muscat de Hamburg and Coarnă neagră selecţionată (21.2 t/ha), Prima Cl. 1022 (20.1 t/ha). At the opposite pole were varieties Tamina (9.9 t/ha) and Silvania (6.4 t/ha).In 2012, 2015 and 2016 years, there have been less than minimum temperature resistance of the vine, and in 2014, unfavorable factor represented him excessive rainfall (994 mm annual, and 640.7 mm, during the growing season), who this year made the most rainy from 1958-2014 period. In 2014 year, pesticide treatments applied, the number 9, did not stop the attack of fungal diseases, so that the degree of attack produced by major diseases, Plasmopara viticola and Uncinula necator. In years with negative minimum temperatures, below the limit of vines resistance, between -23,4…-25,10C, grape production was affected or compromised in some varieties. In these conditions noted the ability of varieties to bear the elements bearing short (Prima Cl. 1022, Perla de Zala and Moldova), and the favorable effect of protecting with earth of fruit wood shoots, as happened in 2016.
