1 way to get max crops,plant 2 types of crops in the big field,and in rows downward.

ex:

X=turnips Z=tomatos or melons

X Z X Z X Z X Z X Z
X Z X Z X Z X Z X Z
X Z X Z X Z X Z X Z
X Z X Z X Z X Z X Z
X Z X Z X Z X Z X Z
X Z X Z X Z X Z X Z
X Z X Z X Z X Z X Z
X Z X Z X Z X Z X Z
X Z X Z X Z X Z X Z