Bean test for sure. Any gnarled looking leaves, STAY AWAY!
It's not Round-up risidual, glyphosate doesnt carry over. Not to mention, if spraying round-up on hay would kill it!
Any Tordon products are what you need to be worried about. Many hay producers use Tordon as a broadleaf herbicide on prairie hay (grassy meadows) and that has a minimum of 7-yr carryover. Tordon, like 24-D kills broadleaf and not grass. Recently at my dad's farm, I noticed that Tordon now comes with a huge label that warn users of the risidual effects and passthrough issues when composting. I'm pretty sure the DOW company recently battled a lawsuit re: compost and risidual carryover.
I end up buying compost, because I cant use any manure from my dads livestock, he uses Tordon and I learned the hard way in my new 30-ft greenhouse with raised beds.
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