I bet thats some pretty country up there Stoker. I've been lucky enough to get invited to South Dakota a few times to pheasant hunt, vast country up there, I suppose its somewhat similar further north.
Its photo degradable "mulch" and used to heat the ground, Like a greenhouse. On a sunny day it can bring soil temp up 30 degrees or so. Otherwise the ground would be too cold here for another month. Not sure this picture will show it well but it was 37 degrees and cloudy that day but condensation was building under the plastic because of the temperature difference.
IMG_4525 by
Mike Allridge, on Flickr
Its a labor intensive process, There are 2 rows of corn under each row of mulch. We use plates in the seed boxes instead of a vacume system, so they will drop 3-4 seeds at a time then be thinned to 2 stalks per hole later. Definite higher yield than "bare" ground corn at 36" row spacing but a lot of work and more risk. But for the next month this is how its planted. Mulch is spaced 6 foot on center if the guy in the seat can keep it that tight. Nothing flat or straight here lol.
Planting will continue until mid/end June with anything from 68 to 85 day seed depending on the conditions. The goal is to keep the market supplied from july 4th till labor day with no holes in the supply or without too much coming in at the same time. Sweet corn is what brings the customers in the door for us all summer.
Years ago they bought a Pix-all picker but that only lasted a few years and didn't have a big enough head for plantings like this. So its all picked by hand. That was my job 7 days a week for years. I don't do that type of work anymore for the most part. But if that's what needs done its what you do. I spend more of my time in the orchards than I do planting anything these days.
Mike