Effect of some summer pruning treatments and the addition of humic acid on some growth traits and yield of grapes )Vitis vinifera L.( olive cultivar

Abstract

This study was conducted in one of the private orchards It is located at latitude 35.53°and longitude 44.38° in Alton Kobri sub-district of Dibs district, about (20) km awayfrom Kirkuk governorate, during the growing season (2020-2021). to study the effectof six levels of summer pruning, the first level (T1) without pruning, the second level(T2) removing the tops of the main branches after the decade and the third level (T3)removing the tops of the main branches after the decade and the level Fourth (T4)removing leaves and leaving (8) leaves for each fruit cluster, fifth level (T5) removingleaves and leaving (10) leaves for each fruit cluster, sixth level (T6) removing leavesand leaving (12) leaves for each fruit cluster. And the addition of three levels of humicacid (0, 20 and 40) g. vine -1 and its symbol (H1, H2, H3) in sequence, in the growthand yield characteristics of grape vines of the olive variety, and it was added a weekafter the contract (25/5/2021). The experiment was carried out according to arandomized complete block design with three sectors. The results obtained can besummarized as follows:First: summer pruning1- The T6 level (leaving 12 leaves for each cluster) outperformed the summer pruningin the percentage of sugars, phenols and anthocyanins over the rest of the levels(14.12%, 0.73%, 0.73%) respectively.2- The T1 level (comparison) was superior to the acidity percentage of the grains(0.41%) over the rest of the levels.Second: Humic acid1- The level 40 g. Vine-1 of humic acid was superior in the percentage of sugars,phenols, and anthocyanin pigments in the kernels (13.07%, 0.57%, 0.66%)respectively.2- Not adding humic acid level 1 (the comparison) led to an increase in acidity in thegrains (0.36%).Third: the interactions between the workers in the study.1- The interaction of the study factors reached a significant level in the effect of all thestudied traits except for the weight of 100 grains. The interaction treatment (T6H3) wasdistinguished that it increased the values and for all the traits except for the acidity inthe comparison treatment (T1H1).