In a series of laboratory experiments conducted with freshly-graded soils, the dynamics of changes in the pHKCl value at the initial stage of interaction of meliorants with soils was studied. It is shown that when determining the pHKCl in freshly graded soils in 1 n. solution of KCl, conditions are created for an accelerated soil–meliorant reaction. The greater the pHKCl shift, the narrower the soil: ameliorant ratio. The duration of the soil–meliorant reaction in a solution of 1 n. KCl did not end after 1 h of interaction. As the duration of interaction increased, the pHKCl of the suspension increased. The average rate of change in pHKCl for 9 hours of being in a solution of 1 n. KCl reclaimed limestone flour (LF) of the soil was equal to: $\user1{v}$ = 0.13, dolomite flour (DF): $\user1{v}$ = 0.12 units pH. The first 5 days after the interaction, soil moisture did not significantly affect the reaction rate. Empirical models of the reaction kinetics of t
