Statistical analysis
With the help of ANOVA coupled with SPSS 13.0 software, an analysis was
made concerning the significance of influence of the planting density on
all the parameters measured and the effect of pipe position, planting
density and soil depth on soil water content. A regression analysis was
then made to determine the different relationships, such as the
relationship between soil water content and moisture suction, the
relationship between the root density and soil depth using the least
square method. Data were transformed when necessary to obtain a linear
relationship.