1
Programa de Pós-graduação em Manejo Sustentável de Recursos, Technische Universität München, Freising, Alemanha. 2
Institute of Agricultural Economics and Farm Management, Freising, Alemanha. 3Laboratório de Mecanização Agrícola, Universidade Estadual de Ponta Grossa, Avenida Carlos Cavalcanti, 4748, Uvaranas, 84030-900, Ponta Grossa, Paraná, Brasil. *Author for correspondence. E-mail: [email protected]
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