Practical test: Six round balers in comparison Despite the advent of the big square baler there is still a significant market for round machines across Europe. Here we focus on the variable-chamber type models from six of the leading manufacturers that purport to be equally at home whether rolling up 1.3m diameter silage or 1.8m straw bales. In this first part of our profi practical test we deal with quality of work in straw and wilted grass