i usually have to plant and replant.....stinking crows...i live next to big commercial grain silos so i usually don't have predator problems racoon etc they are always over there looking for a free meal trucks always spill loading and unloading.rats mice etc.. plus side every other spring they clean them out and dump literally tons of corn,wheat etc on the ground about 500 ft from my house..i wish i could grow corn i have a pretty good grade to my whole property and clay so when it rains the corn like to fall over it never fails it does it when it is about 4 or 5 ft tall...
Have you tried putting a very thin layer of straw over the ground after planting. I do when I plant corn, and it disguises the sprouting seeds enough that the crows aren't attracted to it. May be different in your situation with a high density of crows. Got a gun? (kind of just kidding, b/c with a lot of crows, i don't think you'd make much of a dent in the population, and, IMO, i'd just as soon not shoot birds.) Also, When you've planted corn, have you hilled it after it gets going?? That should prevent it from lodging.