It's more complicated than that. The optimum population to plant say corn varies by soil type. But some seeds don't respond well to high population. When planted tightly together the corn in the fall will have have thin stalks and lodge, ie fall down. Sure you can harvest it but anyone who has ever watched someone try soon realizes they have a lot of losses.

When I was an agronomist I tried with several seed companies to get that kind of information but they didn't want to provide it. I am not certain if that has improved or not.

Most farmers are using 'precision agriculture' and fertilizing by either 2.5 acre grid squares or grids within individual soil types.