To begin the effect with Plant growth and most soil processes, including nutrient availability and microbial activity, are favoured by a soil pH range of 5.5 – 8. Acid soil, particularly in the subsurface, will also restrict root access to water and nutrients.When soil pH drops, aluminium becomes soluble. A small drop in pH can result in a large increase in soluble aluminium . In this form, aluminium retards root growth, restricting access to water and nutrients .