highly significantp < 0.001
Similar results were found when assessing root volume:shoot DW ratio which was highly significant ( p < 0.001) ( Figure 1 ) among varieties with a minimum of 1.9 cm 3 g −1 for Q242 ranging up to 4.3 cm 3 g −1 for Q208; the average of all varieties was 3.1 cm 3 g −1 .