3.2.1.3. Seasonal changes of pH. The soil pH(H2O) varied
significantly (p < 0.05) with the study years, with higher values
in 2011 compared with 2012, and varied (p < 0.001) with the
sampling dates, but not with the soil depth (p
0.05) (Table 3).
Before sowing, under aerobic conditions, the soil pH(H2O) was
slightly acid (pH(H2O) = 5.9) but decreased significantly after the
basal dressing to a value of 5.7 while maintaining aerobic
conditions. Under
flooded conditions, an increasing trend till
topdressing was observed with an average value of 5.9 (Fig. 1).