The effects of percarbamide on the changes of pH and soil exchangeable Mn,Cu,Zn,Ca and Mg contents in 3 acidic soils and 3 alkaline soils in China were studied by indoor incubation test.The results showed that the pH of acidic soils increased quickly,and pH in alkaline soils increased first,then fell,rose again,with the increasing concentrations of applied percarbamide,and the changing range of pH in alkaline soils was smaller than that in acidic soils.The time-course experiment revealed that the rise of soil pH was short-term,with a subsequent...
