I want to estimate the lime rate for acid sandy soils based on the pH buffering capacity (pHBC) of soils. Moreover, I need to evaluate the impact of different organic amendments on the soil pH buffering capacity of soils using:

* Titration method

* Incubation method

* Buffer methods (standard buffer solutions)

* Pedotransfer functions

Which method is best to provide accurate results of pH buffering capacity and easily used to estimate lime rate? Is there a new method available to estimate pHBC and lime rate that is not mentioned here?

How can I draw a calibration graph to know the pH buffering capacity of soil?

Thank you for your information in advance.