To simulate means to imitate, to reproduce, or to appear similar and the art of simulating is as old as man. Since the origin of the civilization, man had to struggle for his survival using, even if unconsciously, simulations of real future processes. Simulation is an analogy with the reality, being common in many areas. Model is a word that admits several connotations, among which the following can be mentioned: (i) the representation of some entity, usually in smaller size than the original; (ii) a simple description of a system, used to explain it or to perform calculations (Swain et al. 2006, 2007). Based on the above definitions, the models can be a prototype, a simplified representation, as well as an abstraction of a reality (system). In crop sciences, simulation and modeling are important to forecast the results of management of a certain system or of a certain environmental condition (Aggarwal et al. 2006a, b).
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