Effect of Spraying Algae Extract and Potassium Nitrate on the Yield and Fruit Quality of Barhee Date Palms Profile Image Abdullah Alebidi 1 Profile Image Khalid F. Almutairi 1 Profile Image Mohamed Merwad 2 Profile Image Essam Mostafa 2 Profile Image Mohamed Saleh 2 Profile Image Nagah Ashour 2 Profile Image Rashid Al-Obeed 1 Profile Image Ahmed Elsabagh 3 1 Plant Production Department, College of Food and Agricultural Science, King Saud University, P.O. Box 2460, Riyadh 11451, Saudi Arabia 2 Pomology Department, National Research Centre, P.O. Box 12622, Giza, Egypt 3 Department of Horticulture, Faculty of Agriculture, Damanhur University, P.O. Box 22516, Damanhur, Egypt Lay Summary Currently there is no lay summary for this publication. You can add one now! Abstract: The effect of foliar spray with algae extract and/or potassium nitrate on the quantity and quality of Barhee date palm yields was investigated during the 2017 and 2018 seasons. Inflorescences of Barhee date palms were sprayed twice, after pollination (1st April of each season) and one month later, with algae extract at concentrations of 0.5% and 1.0% and with potassium nitrate at concentrations of 1% and 2% applied individually or in combinations. The obtained results showed that all of the sprayed treatments enhanced the yield and fruit properties when compared to the controls. Spraying inflorescences of Barhee date palms with algae extract and/or potassium nitrate had a significant effec