To determine if disease suppression against rhizoctonia is achievable in a grey highly calcareous soil using alternative rotational systems and crop inputs in an upper EP environment and if soil microbial populations can be influenced by rotation and fertiliser inputs.

• The higher input brassica break system had higher cereal yields than the other systems in 2009.
• Rhizoctonia inoculum levels were higher under the continuous cropping systems compared to the medic pasture and brassica break crops.
• The different rotations and fertiliser systems have resulted in differences in the microbial community (number) and microbial diversity (their ability to use different sources of carbon).
• Disease suppression is still the same in all rotations.