The soil pH was only affected slightly by the digestate in the
short term (Table 3), probably due to the high buffering capacity of
the calcareous soil used. Organically amended plots had higher EC
values than the control at S1, while the mineral fertiliser treatment
gave the highest EC value at S4. Soil EC values were clearly higher
at S2 and S4 for all treatments, coinciding with the summer period
characterised by high temperatures and low rainfall (Fig. 1), which
favours salt accumulation in the soil. The values of pH and EC were
in the appropriate range for plant growth and no accumulation of
salts was observed with the successive applications of the fertilising
treatments to the soil.