Effect of Foliar Application with Dry Yeast Extract and Benzyladenine on Growth and Yield of Manzanillo Olive Trees

Manzanillo olive trees (Olea euroea L.) were sprayed twice at full bloom stage and two weeks later with dry yeast extract (20 and 40 g/L) and benzyladenine (60, 80 ppm), each alone or in combination besides control (spraying with water only) during 2013 and 2014 growing seasons. Results cleared that, foliar applications of dry yeast extract at 40g / L + benzyladenine at 60 ppm or dry yeast extract at 40 g/L are recommended for improving yield, fruit quality (fruit weight, length, diameter, seed weight, fruit flesh weight, pulp/seed percentage and fruit moisture percentage) and fruit oil content of Manzanillo olive trees. Improving productivity attributed to increase flowering density, perfect flowers percentage, and fruit set percentage as well as leaf area, specific leaf dry weight, total chlorophyll contents and leaf mineral content (N, P, K, Mg, Fe, Zn and Mn).