Biomass and growth To measure biomass and total growth, it was harvested four plants of six months per treatment. Total aerial biomass (MA -g) and terrestrial root mass (MR –g) were obtained by weighting the plant material dried on oven at 60 °C for four days. Root length (LR -cm) was determined by measuring the main root and all the secondary and tertiary roots. To determine the foliar area (AF –cm2) a portable meter LI-3000C was used and, for total height (AL -cm) the plant length at harvesting time was measured from the base till the growing apex.