Effect of foliar sprays with potassium nitrate and mono-potassium phosphate on leaf mineral contents, fruit set, yield and fruit quality of picual olive trees grown under sandy soil conditions.

摘要

The present investigation was carried out during two successive seasons of 2008 and 2009 on Picual olive trees grown in private orchard at Giza Governorate, Egypt. Potassium nitrate (KNO₃) and mono potassium phosphate (MPK) at different concentrations were applied through spraying on the trees either pre or post bloom. Results showed that all treatments of potassium nitrate (KNO₃) or mono potassium phosphate (MPK) caused a remarketed promotion in leaf mineral status, yield and fruit quality compared with the control trees. The best results with regard to foliar application were obtained with KNO₃ at 3% concentration which superior to improve nutritional status, flowering, fruit set, yield and fruit quality.