First the scrub or mallee roller was invented, which flattened the stumps and other vegetation, after which it would all be burnt and crops sown. The technique became known as "mullenising", as the invention of the device  was attributed to a farmer called Mullen.
The invention of the scrub or mallee roller paved the way for the method known as "mullenising", which involved clearing the land by flattening stumps and other vegetation, followed by burning and planting crops.