How Do I Rid The Garden From Nutgrass?

Nutgrass is a pest that can't be stopped with ordinary measures. You need to go an extra mile to be rid of that. Over the years, we've chopped it,
dug it up by its roots, tilled as deep as the tiller would go, then raked it
off and burned it.

The nutgrass would quickly pop back up in the garden as if absolutely nothing had been done. I really think we need to work on the garden plot for at least one year to get rid of the nut grass once and for all.

We were advised to treat the plot with rock salt when the garden is dry,
then barely wet it down with the hose. Not too much water , or the salt
will become weak and ineffective. Or, as another source mentioned, that
sugar would produce the same results as the salt. Either method, if they work would not hurt the vegetables if we plant shortly after the treatments.