I grow several acres every year and plant 30 " rows @ 8" spacing which gives you 25,000 plants per acre. I run 1.5 cobs of salable corn per plant.
I would not recommend these high population with out lots of fertilizer.
10" to 12" seed spacings will give you a nice sized cob with moderate fertility.
I use a single 7000 JD row unit with in farrow low salt starter fertilizer (7-21-7) @ 6 gallons per acre.
We also broad cast 200 lbs of urea (nitrogen) 75 lbs of phosphorus and 150 lbs of potash and 10 ton of cow manure per acre.
Then @ just over knee high we apply 25 gallons of 28% (28-0-0)
We use some Round-Up ready seed and spray with 41% glyphosate @ 2 Qts per acre when weeds are under 3 ".
On our other seed we use Lumax + .5 lb atrazine pre-plant.
On problem weeds I have used Lumax + .5 lb atrazine pre-plant with Round-Up ready seed and use 41% glyphosate after the corn is up
We find these gives use excellent weed control.
If it necessary we spray with Sevin at silking to control the ear worms.
Hope this helps.