The following model is used to represent the effect of solar radiation on the photosynthes...

The following model is used to represent the effect of solar radiation on the photosynthesis rate of aquatic plants:

where P = the photosynthesis rate (mg m-3d-1), Pm = the maximum photosynthesis rate (mg m-3d-1), I = solar radiation (µEm-2s-1), and Isat = optimal solar radiation (µ.E m-2s-1). Use nonlinear regression to evaluate Pm and Isat based on the following data: