Fig. 13. Illustration of effect of hydrogel substrate supplementation on lettuce plants subjected to drought for 7 days; C: substrate without hydrogel supplementation, 1% w/w or 5% w/w-supplemented substrates. CW: set of plants grown without hydrogel were continually watered along the experiment, reproduced with permission from ref. 76 copyright, Elsevier, 2020.
