*5.2. Plant Morphology Parameters*

After 14 d of treatment, four plants from each treatment were randomly selected, and the main growth parameters were measured: plant height, stem diameter, abaxial leaf petiole angle and leaf area. Leaf area was determined using an Li-3000 leaf area meter (Li-Cor Inc.). Specific leaf area (SLA) was calculated as: SLW = leaf area / leaf dry weight. Root morphology parameters were digitized with a LA-S scanner and analyzed using WinRhizo software (LA-S, Wanseng, China). After this, shoot and root samples were heated at 105 ◦C for 30 min and then dried to a constant weight in a fan oven at 75 ◦C. Dry matter was expressed as mg plant–1. Root-to-shoot ratio was also calculated.
