The goals of the current study were to examine the effect of different kinds of acidic biochar [orange peel biochar (OPB),
sorghum panicle biochar (SPB), and wood chips biochar (WCB)] and doses as well as incubation periods on (1) carbon
emission, (2) carbon mineralization kinetic, and (3) soil properties in calcareous sandy soil. One hundred grams of air-dried
soil was placed in plastic jar for this experiment, which is composed of 10 treatments: control (unamended treatment), 1%
OPB, 3% OPB, 6% OPB, 1% SB, 3% SB, 6% SB, 1% WCB, 3% WCB, and 6% WCB. The biochar was added at three levels:
1, 3, and 6% (w/w). All the treatments were arranged in a completely randomized design with three replications. The doubleexponential equation described the kinetics of carbon mineralization better than first-order and second-order equations. The
half-lives of the carbon remaining in the soil were 2.13, 3.13, 4.79, 6.76, 3.33, 5.66, 7.77, 3.50, 5.39, and 7.75 years for
control, 1% WCB, 3% WCB, 6% WCB, 1% SPB, 3% SPB, 6% SPB, 1% OPB, 3% OPB, and 6% OPB treatments, respectively.
The results revealed that the biochar application at different levels significantly decreased soil pH compared with the control
treatment. Applying WCB at all levels and 1% SPB caused a significant decrease in electrical conductivity compared to the
control. Available phosphorus and potassium in the soil are significantly enhanced via adding different types and doses of
biochar compared to unamended soil. Our study is useful when using acidic biochar producing at low temperature in soils
with high pH. That can be improving chemical properties, supplying available nutrients, and carbon sequestration of infertile
soils in arid regions. Additionally, biochar applications into the soil are relatively cheap.