Soil temperature was measured at soil surface and two depths 5 and 10 cm, each 2 h, respectively during day, twice a week. The results are presented as average during both of seasons (Fig. 4). Average air temperatures were generally higher than soil temperatures which measured at depths of un-mulched treatments. It reached a minimum during both of the second and third quarters of June of 22 °C at 6 a.m., and 33 °C at 14 p.m. It increased to a maximum of 26 °C in the morning and 35 °C in the afternoon in July. Air temperatures remained higher than soil temperatures at all depths in previous treatments except in both of DI + TM and DI + BM treatments.