Fig. 2. Influence of pre-sowing magnetic treatments on relative growth rates (RGR)of leaves and roots during the vegetative development stage. T1: 160 mT for 15 min,T2: 160 mT for 20 min and control. The bars indicate the means of 75 plants pertreatment for all harvests from 2009 to 2011. Different letters in bars show signif-icant differences (P < 0.05) according to the Newman-Keuls test. Thin vertical barsrepresent average standard error of the mean.