![]() The macroseaweed extract was effective in stimulate tree growth potential in both years, as shown by a significantly larger leaf area (+20% as compared to control) and by an higher chlorophyll content and leaf photosynthetic rate in year 2016. Treatments were performed at weekly intervals, starting from the end of May until mid-August. Several biostimulants were tested (10 in total), including humic acids, macro and micro seaweed extracts, alfalfa protein hydrolysate, amino acids alone or in combination with zinc, B-group vitamins, chitosan and a commercial product containing silicon. The experiment was conducted during two consecutive seasons (years 20) in an organic apple orchard of the cultivar Jonathan. 2Laimburg Research Centre, Vadena, Italy.1Faculty of Science and Technology, Free University of Bozen-Bolzano, Bolzano, Italy.Sebastian Soppelsa 1 Markus Kelderer 2 Claudio Casera 2 Michele Bassi 2 Peter Robatscher 2 Carlo Andreotti 1*
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