Corn spacing isn't cast in stone and is often debated. In a raised bed with well amended soil and regular applications of nutrients many will plant much closer than in a garden in-ground. Depending on the dimensions of the bed they can usually reach the entire crop from the outside of the bed for feeding, weeding, and harvest. Getting in among the plants isn't as necessary.

So if you browse through all the previous discussions here on corn spacing you'll find folks using anything from 6" up for both plants and rows. Of course variety size plays a small role too when it comes to spacing.

So depending on the exact dimensions of your beds and the access you'll have you could reduce your spacing even more.

I assume you are using the same variety in both beds since they are right next to each other to avoid cross-pollination?

Dave

I will be planting the same variety. Each bed is 30"x8' and I would like to plant 28 plants. 2 rows of 7 plants in each bed. Thanks

I would definitely plant more than 7 plants in each row. 8" spacing would give you 11 in a row and that should be fine in a raised bed. With good soil and proper fertilizing you could probably get away with 3 rows per bed planted at 6"-15"-24"

Agree that more is possible. I'd go to 4 rows wide and 10 plants long in that space. Also, depending on your wind direction relative to the beds, be prepared to do some hand-pollination on the outside edge rows for best production.

Dave