Bob French1, Shahajahan Miyan2, Gaus Azam2
1 Department of Primary Industries and Regional Development, PO Box 432, Merredin, WA, 6415, www.dpird.wa.gov.au, firstname.lastname@example.org,
2 Department of Primary Industries and Regional Development, 75 York Rd, Northam, WA, 6415
Experiments on a limed site show that levels of soil Al that commonly occur in Western Australia can suppress canola yields by more than 50%, similar to the level of suppression of an Al sensitive wheat genotype. We observed significant genotype by lime interactions in yield in three seasons, indicating genetic variation in Al tolerance, however cultivar rankings for tolerance varied from season to season. We also observed large growth reductions in the presence of soil Al in the glasshouse, and highly significant genotype by lime interactions, but again cultivar rankings varied from those in the field. This raises a number of questions: what criteria should we use to judge Al tolerance, how does environment interact with Al tolerance, is Al tolerance better screened in the field or in the glasshouse, and what is the optimum level of soil Al to screen for tolerance.