الفهرس 
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Abstract
A field experiment was carried out to study the influence of ascorbic acid and nano-chitosan as foliar spray on lavender growth and productivity. These experiments were done at the Experimental Farm, Agric. Fac., Zagazig Univ., Sharkia Governorate, Egypt during summer consecutive seasons of 2018 and 2019. The foliar application treatments were nano-chitosan at different concentrations (0.0, 25, 50 and 75 ppm), under four ascorbic acid concentrations (0.0, 50, 100 and 150 ppm) on vegetative growth, herb yield, volatile oil and some chemical constituents of lavender (Lavandula officinalis) plants. The obtained results pointed out that utilizing 150 ppm ascorbic acid gave significantly higher values of lavender growth, yield and volatile oil production as well as total chlorophyll content compared to control and the other concentrations under study. Nano-chitosan at higher concentrations (50 and 75 ppm) significantly enhanced all the recorded traits compared to control (without spray with nano-chitosan). The best results were noticed by the combination treatment between 150 ppm ascorbic acid and 75 ppm nano-chitosan. This combination could be utilized by the lavender producers under the same conditions because this it has the greatest profitable concentrations with the higher herb and volatile oil yield advantages.