EFFECT OF GROW REGULATORS ON THE STOMATA CONDUCTANCE IN THE APPLE TREE

Abstract

This research paper presents the results of a field trial with managed yang orchard including apple cultivar Gala Galaxy, on the rootstocks M9. In November 2012, nursery tree “knip” were planted in the distance 3 m x 1 m. In the first vegetation season (2013) the experimental plot was separated in a randomized block system of four treatments. For research are taken 12 apple trees, which were treated with growth regulators in the stage of nursery trees production with Gerba 2.5% (benzyl adenine), Progebalin2.5%, (gibberellins A4+7 + benzyl adenine) Pinching (i.e. removal of terminal leaves)and Control (untreated). The stomata conductance was examined. During the period from July to September are realized 15 measurements. In each plant measurements made in 10 leaves (5 inside and 5 on the periphery of the crown of the tree). Also in same time made measurement temperature of leaf, soil temperature and moisture, to analyze the dependence between these ecological factors and stomata conductance. By the results obtained the treatment with GerBA 2.5%, has given higher values of leaf stomata conductivity (200.89 mmol m-² s-¹) in relation to treatments, Progerbalinin, Pinching and Control, respectively; (174.76, and 141.94 162. 57 mmol m-² s-¹). It is also remark that exist strong correlation between stomata conductance with soil moisture, soil and leaf temperature.