CONSUMO DE COMBUSTÍVEL EM DIFERENTES SISTEMAS DE PREP ARO PERIÓDICO REALIZADOS ANTES E DEPOIS DA OPERAÇÃO DE SUBSOLAGEM Consumption of fuel in different systems of periodical preparation performed before and after the subsoiling operation

We studied the consumption of fuel in different systems of periodical preparation performed before and after the subsoiling operation on a soil classified as Dystroferric Red Nitosol. The systems of tillage periodic preparation were disc plowing; disc plowing followed by a light disc harrowing; heavy offset disc harrowing; heavy offset disc harrowing followed by a light disc harrowing, and chisel plowing. The specific consumption (g kWh -1 ) of fuel for the different systems of soil periodical preparation varied statistically with the subsoiling condition carried out before and after. The scarification resulted in a smaller volume of fuel requested by hectare (L ha -1 ) than the other systems of preparation. The soil preparation after the subsoiling resulted in a larger volume of fuel consumed by area (L ha -1 ).