Study of Chemical Characteristics Investigation and Depth Direction Sterilization Effect of a Soil by Ozone Treatment

As for securing a yield and quality of crops in limited farmland environment like Japan, a very high technique has been required. The problem to remark to spreading in large quantities of a pesticide and mass use of chemical fertilizer brought it at the same time. This may threaten food safety. In recent years agriculture being aware of reducing a pesticide and organic farming has been studied. However, it is a clear fact that insects exist, and countermeasures should be necessary. We have been studied about ozone treatment of a soil. We confirmed that ozone treatment in a field of agriculture was an effective soil application method. In this study, it was investigated how a soil chemically changed by ozone treatment and in addition, it was confirmed that a sterilization effect was provided by penetration of ozone to the depth direction of a soil. In ozone treatment of topsoil, it was able to sterilized 99% of bacteria of 5cm in depth of a surface.