The Experimental Garden of the Faculty of Agriculture located in Gelumbang is a stretch of land dominated by rubber trees (Hevea brasiliensis) aged ± 30 years with an area of ± 46 ha. The land will be used to perform replanting for annual and other plants with similar seasonal cycles including maize. This study aims to ascertain alkali status (K, Ca, Mg), Cation Exchange Capacity (CEC), Alumu…