Estimating zero plane displacement and roughness parameters in a sunflower crop

A sunflower 'Mimosa' crop was established in the spring of 1995 in Vitulazio (Southern Italy) and well watered until maturity. The energy budget parameters and wind profiles above the surface were monitored througout the crop cycle. The roughness lenght and the zero flux plane displacement height were calculated adopting the graphical approach on 30' minutes interval data. Data are reported concerning the values of d and zo for the different stages of growth.