e ameli - Department of Mathematics, Neyshabur University, Neyshabur-IRAN
m.h RahmaniDoust, - Department of Mathematics, Neyshabur University, Neyshabur-IRAN
e Anjidani - Department of Mathematics, Neyshabur University, Neyshabur-IRAN

The present paper deals with the growth rates such as exponential growth rate, harvest exponential growth rate and allometric growth rate equations. First, these models are introduced and then, their solutions are investigated by picard iteration method.

Growth Rate, Differential Equation, Ecological Modeling, Picard Iteration Method