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. 2018 Sep 20;9:1342. doi: 10.3389/fpls.2018.01342

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Copyright © 2018 Soppelsa, Kelderer, Casera, Bassi, Robatscher and Andreotti.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Chlorophyll content (as SPAD values) dynamics (from 40 to 125 DAFB) in apple plants treated with different biostimulant products and water (control) for year 2016 (A) and 2017 (B). Vertical bars indicate mean ± SE, n = 4. ^∗Indicates significant differences according to Dunnett’s test. ^∗∗∗P < 0.001; ^∗∗P < 0.01; ^∗P < 0.05.