Effect of The Date and Concentrations of The IBA on Rooting and Growth of Semi-Hard Wood Cuttings of Two Olive (Olea europaea L.) Varieties

This study was conducted in the plastic house at the Department of Horticulture and Landscape Design - College of Agriculture and Forestry - University of Mosul, Iraq. For the period from 1/2/2013 until 1/8/2013. To study the effect of three dates of cutting collection from 1st  February to 1st April monthly intervals, and soaking the cuttings in four concentrations of IBA solution 0, 2000, 3000, 4000mg.l-1 seconds on the rooting ability and subsequent growth of semi-hard wood cuttings of two olive varieties Gordal Sevillano and Tanche. The results were showed the cuttings were collected on the 1st of March resulted into the highest of rooted cutting, survival %, carbohydrate content, carbohydrate to nitrogen (C/N ratio) in the basal cuttings. Rooting increased proportionately with increasing of IBA concentrations principally the cuttings were soaked in 4000mg.l-1. Gordal Sevillano cuttings gave a significantly increase of rooting and the basal cuttings gave a significantly increased of carbohydrates content than Tanche variety. The best rooting percentage were get from interaction between Gordal Sevillano which  collected on the 1st of March treated with 4000 mg.l-1 were gave 66.67%. Highest rate of survival (80.0%) of control treatment of Tanche olive variety were taken on 1st of February. The highest content of carbohydrate (18.10) were obtained in Gordal Sevillano basal cuttings were taken on 1st of March. Higher percentage of Nitrogen (1.58%) were obtained from interaction between basal cutting of Gordal Sevillano variety. were taken on 1st of March. The highest percentage of C/N ration were got by interaction of Gordal Sevillano which collected on 1st of March.