Why fallowing may fail
It is one thing to walk through your fallowing paddocks to pull out the odd ragwort. It’s another if you have barley grass and buttercup taking over.
Fallowing is a great technique if you have a good-quality pasture. The increased density of the grasses will crowd out many weeds and prevent the seeds of annual weeds finding bare earth to germinate in.
Overgrazed paddocks with a lot of weeds and/or undesirable grasses won’t do well. You need to resow first with desirable herbs and grasses.