Response of Olive Trees Irrigated with Sewage Water to Foliar Spray with Salicylic Acid, Chitosan and Algae Extract

Abstract

This work amid to investigate the beneficial effects of the biostimulating treatments under treated Sewage water. Foliar spraying of salicylic acid at 0.5 and 1 g-1, chitosan 2 and 4 ml-1 and alage extract at 2 and 4 ml-1 start at June and repeated 8 times on growth, flowering and fruit quality of olive trees grown under treated sewage water applications. Results indicated that chitosan at 4 ml-1 significantly increased growth parameters fresh weight of leaves/branch g, dry weight of leaves/branch and total leaf area/branch cm2. Flowering characteristics i.e., date of full bloom, flowering density, total number of flower/inflorescence. In addition, fruit yield/tree, fruit yield /faddan (ton), fruit weight g, fruit width (cm), fruit length, seed weight, flesh weight, percentage flesh/fruit weight. Also, fruit chemical quality i.e., fruit moisture %, fruit oil content and refractive index, were increased with chitosan at 4 ml-1 during both seasons. Meanwhile, peroxide value and acid value % were decreased with the same application during both seasons. Using chitosan is best superior for increasing olive growth and yield under treated sewage irrigation water.