2.3. Statistical treatment
Student’s t-test was performed to test whether the average concentrations
in the treated pots differed from those of controlled
pots. Results that were significantly different were marked by (*)
for p
≤
0.05, (**) for p
≤
0.01 and (***) for p
≤
0.001. Statistics were
performed using the XLStat package (Addinsoft, Paris, F).