Fig. 4. Weight per seed (W_s) as a function of cumulative intercepted radiation (PAR) per plant from 250 to 450°C day after flowering for Exp. SDT1, SDT2, LDT2a, LDT2b, LDT3, and LDT4. (a) The line represents the relationship established with intercepted radiation < 37 MJ plant^-1 (equation in Fig. 3). (b) The regression represents the relationship established with intercepted radiation < 37 MJ plant^-1 (equation in Fig. 3) and the horizontal lines represent the maximum W_s calculated for each plant density (W_s = 81.64 - 4.75x). Data points represent values obtained in each experimental plot.