Waste ash also has a high pH and may be beneficial as a liming agent (Sander and Andren, 1997; Zhang et al., 2001a). It has been reported that in Japan the liming effect (its acid neutralization capacity) of incinerator bottom ash (IBA) was equivalent to 15–40% of calcium oxide, a very powerful liming agent (Zhang et al., 2001b). Therefore, it is practical to use municipal waste ash as a soil nutrient and as a liming amendment for acidic soils as a way to ease the burden of its disposal (Kawase et al., 1972). Waste ash can be applied by mixing it with other materials, such as animal excrement and urine, food scraps and sewage sludge