Thank you so much
@Freezengirl: I will cut back the corn (per the link) to 4 in a hill. Also I thought that the nitrogen was fixed during the growing season, but the link says it takes a year to get it to the corn. Good thing that soil is from my oldest beds and the best I have!
@Philip: I was going to plant 4 zucchini in the whole 6' x 6' (not in each hill). Do you still think I should only have 2 in there?