Figure 12.21 Changes in (a) dry matter, (b) leaf area index (LAI), and (c) photon irradiance at ground level for wheat crops grown at five different densities, 1.4, 7, 35, 154 and 447 plants m-2 for treatments 1 to 5 respectively. (D.W. Puckridge and C.M. Donald, Aust J Agric Res 18: 193-211, 1967)