Soil solarization, a sustainable method of soil disinfection was tried on two semi-arid soils located in Murcia (SE Spain) to study chemical changes in soil properties using polyethylene film as a cover. A decrease in organic matter and an increase in electrical conductivity were observed, while no significant changes in pH, total nitrogen and phosphorus were detected between mulched and unmulched soils. For Diethylenetriaminepentaacetic Acid (DTPA) Extractable (Ext-) micronutrients such as copper, manganese and iron, a weak trend towards increased availability was observed after solar heating, although only iron and manganese showed significant differences between covered (solarized) and uncovered (unsolarized) soils.