بررسي تعيين زمان برداشت سه رقم زيتون و تاثير آن بر كميت و كيفيت روغن استحصالي در منطقه گرگان

Determination of harvesting time of three cultivars olive and its Effect on quality and quantity of oil in Gorgan region

The harvesting time and storage conditions of olive fruit are effective factors on the quality and quantity of olive oil. The harvesting time of olive is different in each area and it depends on climatic conditions.In this study, three selected cultivars of Gorgan region include of Mission, Bleaidy and Roghani were harvested from middle September till early December with two week intervals and then quality and quantity of oil was determined. The results showed the oil content (on dry basis) for Mission reached to maximum level (44.2 %) in the middle of November and for Bleaidy and Roghani were 52.1 and 50.2 % respectively in the beginning of December. All increased oil content (as fresh % w.t) was due to decrease in water content of fruit. The acidity of oil during harvesting time arised countinously so that it was increased significantly after December. Therefore, the best harvesting time for these cultivars is beginning of December.