>Some Roundup ready corn and soybean fields in the US are
shockingly devoid of anything except the seeded crop.

So much so, that many pollinator establishment guides recommend the use of
Roundup Ready soybeans as the ultimate soil prep as it allows for a
clearing-out of many of the 'weeds' in the seed bed:

*'The ‘Gold Plan’ of pollinator habitat establishment is when pollinator
seed mixes are established into fields previously planted to soybeans.
Without question, this technique produces the best short-term and long-term
results for larger projects. Assuming that Glyphosate was applied as needed
during soybean production, weed competition on the site should already be
well-managed. In addition, soybean root nodules fix nitrogen, providing
necessary nutrients for the pollinator seed mix to germinate, grow and
become established. Soybean stubble also provides one of the best seed beds
for planting. For areas that are in existing grasses, following the Gold
Plan involves the termination of existing grasses by planting the site to
soybeans for one full growing season and treating the site like
conventional agriculture.'*

https://www.beeandbutterflyfund.org/uploads/1/3/3/3/133320811/habitatguideinteractive7_22_21.pdf

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