Efeitos de uma camada de palha no comportamento térmico do solo.

The presence of crop residue on the soil surface has an impact on evaporation, water storage, soil temperature and soil heat flux. Consequently, changes the energy transfer in the soil-atmosphere system. The objective of this work is study the influence of crop residues in the soil thermal variables. It was concluded that the thermal effect of a straw layer is large, leading to surface temperature differences around 10 °C. With depth increasing, the effect of straw coverage decreases, leading to a temperature difference to 4 °C of 5cm depth. The most important consequence of higher temperature on bare ground is an increase of soil heat flux. In stable weather conditions, this difference can reach 29W/m². [ABSTRACT FROM AUTHOR]