[Effect of nitrogen, boron, and zinc spray on the production of olives And on the persentage of oil for tow cultivars (Dan-Nebalymohasan)]

This experiment was carried during the seasons 2009-2010 in the olive grove in the province of Damascus (area Almedmah) on two cultivars of olive (Dan - Nebaly) to study the effect of spraying of leaf foliar to one of elements major nitrogen and elemental boron and zinc on the vegetative growth, flowering, production and the percentage of oil. Each of these elements were sprayed individually or together , olive plants wear sprayed four times during the growing season, at certain times of the solutions: nitrogen (5 g / l), boric acid (2 g / l), zinc sulfate (2 g / l) The two elements together (urea + boric acid) and (nitrogen + zinc sulfate) and (Boric Acid + Zinc sulfate) and the three elements together (nitrogen + boric acid + zinc sulphate) at the same rates in single spray. Results showed a significant difference at 5% and between the control and other treatment,in plant growth and production compared to control after treating with N, B and Zn, where increased the leaf area, especially in treatment (N+B+Zn) of the variety of Nebaly Mohsen and treatment ((N) of the variety Dan, and increased the shoot length in all treatments for tow varieties Nebaly and Dan. For the number flowers were increased in all treatments for tow varieties Nebly and Dan, and number of fruits in treatment (N+B+Zn) for tow varieties. 77 It was Also nuted a significat increase in content of the leaf of the element nitrogen, in all treatments for tow varieties Nebaly- Dan, but,there was no significant difference in the content of the leaves from the phosphorus in treatments of the variety of Dan and increase in treatment (N+B+Zn) of the variety of Nebaly, and the element potassium, especially in treatment (N+B+Zn) of the variety of nebaly and Dan, while the increased in content of the leaves of the element boron in all treatment of the variety of Nebaly and treatment (N+B) and treatment (B+Zn ) of the variety of Dan, and increased content of zinc in all treatment of the variety of nebaly,and treatment(N+B+Zn) of varirty of Dan, And increase the proportion of oil, especially in all treatments of the variety of nebaly and Dan. while it nuted no significat increase on The percentage of free acids (oleic acid) and peroxid compared to control in all treatments at the olive varieties in this experiment. Kew words: Olea europea, Leaf area,Shoot length, Flowering, Yield, Pulp weight, Oil content,Olic acid, Peroxid value, Urea, Boricacid, Zinc Sulphat, foliar application