Fig. 1. Relationship between kernel number per uppermost ear (KN₁) or per plant (KN_P) and plant growth rate during a period bracketing silking (PGR_s) in five maize hybrids released in Argentina in different decades. Curves are the fitted Model 1. Triangles represent kernel number of prolific plants (kernel number of the topmost and second ear). Other symbols represent KN₁ at low (2–4 plants m^–2; solid circles), intermediate (8 plants m^–2; squares), and high plant densities (16–30 plants m^–2; white circles).