3.2. Effect of Si treatments on soil characteristics
Soil pH in pots with plants was larger than in pots without plants
(Table 4). The pH slightly decreased in the pots without plants
treated at 10 and 15 ton ASi ha−1. No pH changes were observed
along the various treatments with plants. Soil pH in pots with plants
was larger than in pots without plants (Table 4). In non-sown pots,
pH was slightly lower (not significantly) after 71 days in the pots
that had been treated with 10 and 15 ton ASi ha−1 than in both the
control and the 1-ton ASi ha−1 pots. In sown pots, pH did not change
significantly with ASi treatments as compared to the control pots.
Fig. 5 presents the results of the DTPA-TEA extractions performed
on the soil collected from the pots after wheat harvest. In
pots both with and without plants, DTPA-extractable Cd concentrations
slightly decreased in all ASi treatments, but this decrease