Some of the techniques I use to plant corn is as follows:
1. Do a soil test, once you get your results add the minerals or whatever to balance ph as much as possible.
2. Make sure your soil is at 60 degrees or very close as this an ideal temperature to plant corn regardless if its May, or June. Use a soil thermometer to know for sure.
3, plant your corn in rows, typically with your seeds 6-10" a part and each row should be close to 2-3ft apart. The reason for rows together isn't it just because it will look pretty but more importantly it helps pollinate the corn stalks and to grow and produce much better.
**Another cool tip to keep the weeds down with using what's already on your property, and without the use of chemicals is to put black walnuts around the soil, the acidity and organic matter gets into the soil and helps by keeping weeds at bay.
You can also use pine needles, or even plant some clover around the corn and it will compete for that space and drive out allot the weeds and you won't have to deal with it as much.
Good luck, and have some fun out there! and drop a note to say hi sometime :)