Desempenho técnico e custos da mecanização florestal sob diferentes preparos de solo

Abstract

The mobilization of soil tillage operations influence the technical and economic performance of the tractor-implement. Thus, aimed to determine the mobilized soil profile, the force required on the draw bar, skating, fuel consumption, theoretical field capacity and costs for different soil. To this end, we used farm tractor New Holland 8030 4x2 TDA, power 90 kW at 2200 rpm, one harrow brand Kohler GAC300 16x30 "and subsoiler drag MarchesanTatu AST / MATIC. The experimental design was a completely randomized design with three treatments: T1-tractor-harrow depth of 0.18 m, T2-tractor-subsoiler shank with a depth of 0.32 m and T3-tractor-subsoiler shank with a depth of 0.57 m, with eigth repetitions. To estimate tensile strength we used a load cell of a Kratos 100 kN. To find the mobilized soil profile soil sed a perfilometer artisanal timber with stems placed every 0.05 m. The soil was classified as “LatossoloAmareloÁlicoCoeso” plane relief, characteristic of a Coastal Plain soil. Treatment tractor harrow had the highest area mobilized soil. The tractor subsoiler (0.32 m) presented the best technical performance and lower operating cost per area. The tractor subsoiler (0.57 m) showed the greatest demand for tractive effort, drawbar power consumption and greater time skating, but resulted in the best cost benefit considering the productivity factor.