Very similar situation with me last year. Tell you how I set up last year. After attempting to hunt a tree that was "sort of close," and no success, I hunted the weeds.
They were goldenrod.
I cut an area to the ground big enough so I didn't twang any stalks with my equipment. Then I cut a path to the trail that was about 24 to 30 inches off the ground. The path to the trail was such that the deer would have to pass me going to the soybeans. In fact, I made it so I could shoot where the deer would naturally stop: right at the field opening (your case will be different with corn).
Yearling came through at 25 yards and started eating soy beans. Twenty minutes later, a mature doe came through at 6 yards and angled toward the field, stopping to observe the yearling. That was 11 yards where I made the shot. (I wondered why I'd bothered with trees in the first place).
I have no problem with natural ground blinds. But, make sure you have plenty of cover. If not enough cover, then be creative with creating extra.