BIOREGULATOR INFLUENCE IN SHAPING OF THE “KNIP” APPLE TREE NURSERY

This research work presents the results of a field trial with managed nursery trees including apple cultivar Gala Galaxy on the two different rootstocks M9 and MM 106. In April 2011, the saplings (copulated in March 2011) were planted in the distance 100 cm x 35 cm. In the second period of vegetations (2012) the field demonstrate separated in randomized block system in five combinations of treatments (Control, removal of terminal leaves, Progerbalin (GA4+7 )1.8%, 2.2%, and 2.5%,) with three repetitions (in total 150 saplings for each apple rootstock combinations). We examined following parameters: trunk diameter 10 cm below and above the graft place, diameter of branches, length of apple tree nursery, number of lateral shots, length of branches and crotch angle of branches. Application of treatments was done three times in 14 days interval, starting when the main axis reached the length of 15 cm above cutting scion (70 cm on the ground). All parameters are shown differences between treatments and removal of terminal leaves compare control (untreated). But the treatment with Progerbalin (GA4+7 ) 2.5% resulted in the lower tree height, in the higher number of branches, and in the greater branch length compare with other variants in particular control, for two rootstocks M9 and MM106. While the removal of terminal leaves has displayed more influence width crotch angles.