Fig. 1. Results from particle dispersion model for four different particle size distributions (log-normal with median particle diameter = 80, 160, 240, and 320 µm and standard deviation ln(1.8) throughout). Conditions assumed throughout: canopy height h_c = 0.50 m; leaf dimension d_c = 0.01 m; field length x_p = 1000 m; spray release height h_s = 2 m; initial plume height _Z0 = 1 m; atmospheric stability is neutral (D); wind speed u_r = 2 m s^-1. Panels: (a) depleting mass fraction s(x); (b) deposition -ds/dx = -s'(x) for a laterally uniform unit line source; (c) drift deposition fraction f_drift(x) for a plane source from Eq. [12].