تأثير IBA و قلف أشجار الصنوبر كوسط زرعي في تجذير و نمو عقل شجيرات الدفلة Nerium oleander

Abstract EN

A study was conducted in the fiber class of Horticulture and Landscape Desing department - College of Agriculture - University of Kirkuk - Iraq during 2016 - 2017.

The study investigated the effect of using different concentrations of IBA (0, 1000, 2000, 3000) mg.

L-1 and the different types of media included (sand, non- treated bark, non-treated bark + sand 1: 1, treated bark, treated bark + sand 1: 1, peatmoss, peatmoss + sand 1: 1) on rooting and growth cuttings of and Nerium oleander.

The experiment was analyzed using RCBD Split split plot design with three replications and ten cutting in each experimental unit.

The results showed that IBA did not significantly effect on longest root length.

The comparison treatment gave the highest value of the diameter of the longest root.

The number of secondary roots was significantly affected at (1000, 2000(mg.

L- (21.71, 25.48) root.

cut-1, and the percentage of rooting was affected at (1000) mg.

L-1 (59.52) % .

For the effect of the different rooting media, non-treated pine bark gave the highest length of the longest root (15.59) cm and (non-treated pine bark + sand 1: 1) media gave the highest value of the longest root diameter (0.65) cm, while the sand recorded the highest values for the number of secondary roots (31.29) root.

cut-1 and the percentage of rooting (63.33) % .

The vegetative effect was significantly affected by the study results of the leaves area, where the highest effect was obtained from using the concentration of 3000 mg.

L-1 (10.38) cm2 and (treated pine bark + sand 1: 1) media (11.04) cm2.

The leaf content of total chlorophyll was not significantly affected by IBA and the highest value of chlorophyll content was recorded using the (peatmoss +sand 1: 1) media.

Concentration of 3000 mg.

L-1, gave the highest concentration of nitrogen (6.966) % and carbon (1.678) % , while the concentration of 2000 mg.

L-1 recorded the highest number of C / N Ratio (0.26).

Non-treated pine bark media caused increaseing nitrogen content (7.000) % , while treated pine bark media increased carbon content (1.754) % and (treated pine bark + sand 1: 1) media raise the C / N Ratio (0.31) for leaves.