control and vermicompost treatments (e.g., from 5.2 to 5.6 t ha−1 for
control and from 6.8 to 7.3 t ha−1 for vermicompost, P b 0.05), the second
year for the vermicompost treatment (e.g., from 4.6 to 5.2 t ha−1
),
and in the last year of the experiment only for the control treatment
(from 4.2 to 4.7 t ha−1
, P b 0.05 in all the cases).
Difference in weed biomass was not significant in the first year of the
experiment but reached almost 1 kg m−2 in the second and third years
(Fig. 5). Treatments significantly influenced weed biomass (P b 0.05). It
was significantly higher compared to the control when organic amendments
were used (P b 0.05 in comparison with the control) but no significant
differences were measured between the three organic
substrates (P N 0.05). Biochar did not significantly influence weed
growth (P N 0.05)