If these were planted in rows, I would drive a post at the end of each row and more posts about every 6 or 8 feet. Then I would take bailing twine, tie to one end post, and weave the twine from one post to the other until I reached the other end post. The corn plants can be pulled upright as I go. Short pieces of twine could be used to tie the long line to the middle posts.
If this is a bed of corn, I would set my posts around the outside of the bed and use the bailing twine first to encircle and then running across and even diagonal to hold the corn plants upright.
Providing a lot of soil moisture is always a good idea after there is any injury. However, corn often falls in winds once the soil is saturated. Better have supports in place first before turning on the water. The plants can grow out of the injury but without straightening first, they can also grow crooked and stay that way.
Thank you. I am heading out to drive the posts and pull them up with rope. They are planted in rows. So t-posts at each end and may be one in the middle. Rows are only about 12 feet long.
I've used that method before! This year mine blew down again and I didn't have time to right it......but it righted itself within a week, especially after consequent rain storms.
It's called a "Florida Weave" when you use the technique for tomatoes. The Colorado State students had some problems with broken wood posts but, I think, only because their rows were so dang long.
Corn shouldn't put nearly the weight on the trellis as tomatoes will. And with luck, most years you won't need to do the work at all .
Actually since it is sweet corn, I'd suggest to leave them alone. The roots have already been displaced. Moving them a second time will only injure them again. The plants will straighten up on their own. It is called goosenecking. Happens in field corn all the time due to winds, rootworms, excessive rain, etc.