Experimental results of all parts of the energy balance equation, measured during the LINEX-97/1 experiment, as well as variations with the time of the surface temperature are shown. During the diurnal cycle the exchange processes between the atmosphere and the underlaying surface was found instationary. The measurements of the heat storage in the upper 2 cm layer of the soil showed values up to 20 % of the net radiation. In comparison with all fluxes this storage energy can nearly close the energy balance at the surface. Therefore, indirect measuring methodes, like Bowen ratio-method, which are based on staty state conditions would determine the turbulent fluxes of sensible heat and water vapour with errors up to 35 %