Research: Roundup is used on many kinds of non-organic crops (including non-organic oats and hemp) to kill them in the field and dry them on the stalk right before they are harvested.  This provides significant savings in harvesting costs because dry crops are easier to be cut and transported, and don't need to be sent through a grain dryer. Of course, as you can imagine, spraying crops with Roundup right before harvest makes the glyphosate levels even more concentrated for the people who consume it.