“…The supply of K is a complex phenomenon involving many biogeochemical properties and processes in the soil [ 9 , 10 ] that determine the equilibrium kinetic reactions between the K forms [ 11 ]. Different studies revealed factors such as the degree of weathering [ 12 , 13 ], nature of parent materials [ 12 , 14 ], and soil taxonomy [ 15 , 16 ] had great effects on K release and fixation.…”