A good indicator for tomatoes is 25 lbs. for every square ft. of greenhouse space. And all you have to do is see what tomatoes are going for at your supermarket to see how profitable it can be.
Another for Tomatoes is they require from 3.85 to 4.75 square feet of greenhouse area per plant. Therefore, the plant population in a 31' x 132 greenhouse will range from 1,060 plants to 834 plants. Production is normally calculated in pounds per square feet of greenhouse area. It can range from 5.5 pounds per square foot to 7.25 psf per year with currently available varieties.
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