Otimização linear aplicada ao plantio sustentável de vegetais

Abstract

The crop rotation planning is a rising topic for providing a significative reduction on the usage of industrial fertilizers, pesticides and other chemical, allowing the soil to selfsustain. This study focus on using rotations to meet a periodic and pre-defined demand while ecologic restrictions, that help sustain the soil's stability, define a valid crop rotation. Mathematical models that consider a minimum size of a used lot associated with a given rotation and heuristic resolution methods, based on column generation, are presented. A detailed analysis of the methods behaviour before changes on parameters and criteria is performed. The first heuristic, called GC-BC Algorithm, achieved better and faster results compared to the second heuristic, called Fixed Lot Heuristic. However, combining both heuristics produced even better results, that is, solutions that respect the minimum lot sizing restrictions in good execution time for an annual planning. The idea behind of generating additional columns to the restricted master problem produces good quality solutions, which may be applicable in other research areas that require column generation for their resolution with a reasonable execution time.

Atuação em lazer do profissional de educação física: um mar de oportunidades no “Mar de Minas”?

“…Realizou-se um levanta-mento de dados utilizando-se fontes variadas. Em conjunto com o estudo qualitativo descritivo, o estudo documental foi realizado no intuito de analisar documentos que não receberam tratamento analítico (GOMES; AMARAL, 2005).…”