Chaungzon Township is located on Bilugyun Island lying at the mouth of Thanlwin River and immediately west of Mawlamyine. It has an area of 658.13 square kilometers. With a mean temperature of 82.53° F (28.07°C) and annual rainfall of 198 inches (5,004 mm), the township has the Tropical Monsoon Climate (Am). Lying on the eastern coast of the Capali Sea and in the Tropical Zone, it is hot and wet. The entire township is plain area through which many small streams pass. Depending on the above physical factors, paddy is yearly cultivated on 65,365 acres (40% of the township area), of which 99.8% is cultivated in monsoon season and 0.2% in summer. The aim of this study is to investigate the effect of potential evapotranspiration (P.E) and annual rainfall on paddy yield per acre in Chaungzon Township. It has been examined by means of regression analysis and graphical method. According to the results, it is found that in monsoon season paddy yield per acre decreases whenever P.E increases and in summer season yield per acre increases with the rise of P.E. The result by graphical method shows that low P.E. in onset of paddy growing season and high P.E.in harvest period result in higher yield per acre of paddy. Therefore, it is suggested that paddy cultivation should be practiced in the township as shown in the result
