Fig. 2. Estimated daily pollen production of an individual tassel and accumulated number of exposed silks from the apical ear (E₁) of hybrids DK664 (top panels) and DK752 (bottom panels) cropped at two plant densities (3 and 9 plants m^-2) at Salto. The parameters correspond to the Gaussian equation (Pollen grains tassel^-1 = x e^{[-2(DAA-c)2/b2]} fitted to pollen data, where a is the area under the curve; b is the number of days between those two points of the curve for which pollen production is half of maximum daily pollen production; DAA is days after start of anthesis; and c is the DAA when maximum daily pollen production is reached.