2.5. Statistics
An ANOVA was performed on the randomized block design using the statistical software package Statistica v. 13.3 (StatSoft Inc., Tulsa, OK, USA) to evaluate the significance of the different organic amendments and the soil depth of the root morphometric parameters and plant yields (Table 3). The data were checked for the normality of the distribution using the Shapiro-Wilk test. The homogeneity of the variance was checked using Levene’s test. Multiple comparisons were performed using Tukey’s HSD test at the P < 0.05 level of significance. Pearson’s correlation analysis was used to analyse the correlation between the root morphological parameters and the aboveground biomass production. A regression analysis was carried out to describe the relationship between the root morphological parameters and aboveground biomass.