Effect of foliar spraying with potassium dehydrogenase phosphate and yeast extract on yield and fruit quality of Sukary date palm (Phoenix dactylifera L.) in Saudi Arabia

摘要

As a natural bio - stimulant, bread yeast has an influence on growth, yield and fruit quality of many crops. This research was conducted during two successive seasons, 2013 and 2014, in order to study the effect of spraying with yeast and potassium dehydrogenase phosphate (KH 2 PO 4 ) on yield, bunch weight and fruit quality of 13 ye ar old Sukary date palm. Five spraying treatments were performed with control (water only), potassium dehydrogenase phosphate at 1 and 2%, and yeast at 4 and 8%. These treatments were applied once at 4 weeks after pollination or twice at 4 week after poll ination, repeated after another 4 weeks. All treatments with yeast or potassium dehydrogenase phosphate twi ce had a pronounced effect compared with the control fruit d uring both seasons. Spraying Sukary date palms twice with potassium dehydrogenase phosph ate (2%) was effective in improving yield, bunch weight and fruit physical characteristics, while spraying yeast (4 and 8%) improved soluble solids content (SSC), and total and reducing sugars.