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.