Studies related to the effects of HA on plants have been generally conducted on herbaceous species under laboratory experimental conditions and only a limited number of reports concern with soil and foliar applications of HA in the field and are limited to few species, such as asparagus (Tejada and Gonzalez, 2004), olive (Fernandez-Escobar et al., 1996), Pomegranate (Khattab et al., 2012).