Effect of Ozone fumigation on morpho-physiology and yield of field-grown rice in Pearl River Delta, China

Ozone pollution may cause a reduction in grain crops production. The response relationship between plants and Ozone is an important factor to assess the effect of Ozone pollution. In order to learn the effect of Ozone pollution on major grain crops in Pearl River Delta, this study used Open-top chamber (OTC) to fumigate the rice in the field, and researched the effects on the physical manifestations, physiological form and yield of rice which was fumigated by different Ozone concentrations. According to the experimental results, with increase in Ozone fumigation gradient, the rice was damaged gradually. And the height, biomass and yield of rice were reduced. By fitting concentration response model and dose response model, it can be estimated that the Ozone concentration and Ozone AOT40 value for 10% rice yield loss of single cluster were 61.7 nL/L and 13.08 h nL/L respectively in this experimental area.   Key words: Modeling, Open-top chamber (OTC), Ozone, rice, production loss, AOT40.