Industrial Wastes in Soil Improvement

Table 2

Chemical composition of rice husk ash.

Constituent	Percentage
Silica (SiO2)	91.1
Alumina (Al2O3)	0.4
Calcium oxide (CaO)	0.4
Ferric oxide (Fe2O3)	0.4
Sodium (Na2O)	0.1
Sulphur (Na2O)	0.1
Magnesium oxide (MgO)	0.5
Potassium oxide (KaO)	2.2
Loss on ignition	4.8