“…For instance, the results obtained for grape and olive pomace, olive leaves, grape seeds, marigold, cinnamon, sage, green tea, tannin, thyme, and rosemary extracts, as well as different mixtures of polyphenol sources, can either increase (Eid et al, 2003;Tavarez et al, 2011;Lu et al, 2014;Bravo et al, 2014), decrease, or have no effect on productivity (Goni et al, 2007;Gurbuz et al, 2010;Brenes et al, 2010;Rezar and Salobir, 2014).…”