Abstract
Growth mathematical model had been used to estimate yield Per unit area for Platanus orientalis L. fifty five sample plot were used, which selected randomly by different ages. The non-linear regression model was used to develop, the relationship between the yield per unit area, as the dependent variable, and ages of stand as the independent variable. Selecting the best model ,different measures of precision such as , coefficient of determination, stander error of percent, and Ohtomo graphical test were used, as are result the model. Y=230.27(1-exp(-0.06971 A))1.5841 R2=(0.81) S.E%=(2.3354) Also in this study , the best rotation age was developed and it appeared that the best time to harvest Platanus Orientals L. is at (13)years of age.
