chisel plowed, disked, or ripped fields aren’t hard to hide in. We all bought cheaper used layouts and painted them, but you can mud your blind about as black as paint if needed. Lightly stubble to match the field, and set up 45 degrees upwind of the decoys so the geese aren’t looking right at you on approach.
Canadas seem to always prefer the worked fields over the stubble corn. Mallards will hit disked corn, but well worked black fields they tend to avoid unless it’s really cloudy or wet.
Some tricks to being more visible in those fields with your spread is add some canada wind socks, add 3-6 snows, and increase the amount of white on some of your decoys. Older shells work great for this trick.