except T300M10 when compared to control (Fig.3). The highest
available water capacity (AWC) which is 97% higher than control
was for T500M20. The AWC of T500M20 was 33% and 40% higher
than the AWC of T400M20 and T300M20, respectively. Thus, it
can be suggested that biochar pyrolysis temperature influences
the moisture retention capacity of biochar especially under sandy
soils. Thus, if the goal is to improve sandy soil hydraulic
properties, biochar should be produced at 500°C. The improved
hydraulic properties of sand as a result of biochar addition could
be attributed to the high porosity and surface area associated
with biochar 12, 30. This is because the numerous surface area and
pores of biochar have to be first filled up before gravitational
drainage down the soil thereby reducing water permeability and
increasing water retention in the treated soil. The implication is