On the Kolan River north of Bundaberg, cane farmers Glenn and On the Kolan River north of Bundaberg, cane farmers Glenn and On the Kolan River north of Bundaberg, cane farmers Glenn and On the Kolan River north of Bundaberg, cane farmers Glenn and Susy Robertson are taking steps to change their fertiliser Susy Robertson are taking steps to change their fertiliser Susy Robertson are taking steps to change their fertiliser Susy Robertson are taking steps to change their fertiliser management for the better.