Figure 5

Wheat root activity in 2004 using mini-rhizotrons at six depths in the red Kandasol. (a) The total number and number of wheat root intersections counted at each depths as a function of time after sowing. (b) The time taken after sowing for wheat roots to achieve the critical depths of 0.2, 0.4, 0.65 and 0.9 m. In the equation in figure b; y is the depth of roots (m) and x is the day of observation after sowing.