Answer: What a great idea for a booth!
This information was actually more difficult to find than I thought it would be. I imagine that's because yields are affected by so many factors, including variety, weather, pest managment, and cultural methods.
John Jeavons, in his book "How to Grow More Vegetables" ("...than you ever thought possible on less land than you can imagine"), Tne Speed Press, Berkelely, CA, revised 1991, gives some general yield information.
tomatoes: 1.9 to 16 lbs per plant
green peppers: .2 to .8 lbs per plant
cucumbers: 1.0 to 3.6 lbs per plant
eggplant: 1.0 to 3.0 lbs per plant
pumpkins: 3.4 to 13.6 lbs per plant
zucchini: 3.0 to 9.0 lbs per plant
potatoes: .4 to 3.1 lbs per plant
It might be interesting to research the Victory Garden literature from the war years. This program encouraged people to increase home food production.
I hope this helps!
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