Biochar made from P. massoniana bark positively affected soil
acidity amendment, such as decreasing exchangeable Al3+ and
exchangeable acid levels as well as increasing pH and exchangeable
base properties. However, the effect declined to a certain
extent when the biochar underwent short-term (e.g., for several
months) aging without soils, but the effect may persist and remain
constant in long-term, which needs to be further studied. Little
changewas observed regarding the effect of biochar on soil acidity
amendment under different incubation methods (sealed and
ventilated). Ventilation conditions seemed to have little influence
on the soil acidity amendment using biochar. In other words,
biochar PB can be used to amend acidic soils in this region, but the
effectiveness will decrease if the biochar has undergone aging
before being added to the soil, e.g., during the period of storage.
Thus, fresh biochar should be stored with caution. More types of
acidic soils and biochars (newly produced and aged to different
timescales) should be tested.