The objective of the present study is to investigate the impact of spraying algae extract and / or potassium nitrate on yield and fruit quality of cv. Medjool date palm. This study was carried out during 2014 and 2015 growing seasons. Inflorescences were sprayed with algae extract at (0.5 and 1%) and potassium nitrate at (1 and 2%) as individual application or in a combination between them. In general, results indicated that spraying inflorescences date palm with algae extract and / or potassium nitrate had a significant effect on yield, fruit physical and chemical characteristics of Medjool date palm when compared to the check treatment. The effective was in proportional to the increase in concentrations of both materials. The superior treatment concerning yield and fruit quality was spraying Medjool date palms two times with high doses of combined treatment (1% algae extract + 2% potassium nitrate) in the two experimental seasons
