Discussion
Which of the following training systems is suitable for bountiful harvesting of tomatoes in a polyhouse?
Answer: A
The key gives the 2-stem system. In a polyhouse the tomato is trained to one or two main stems, and the key picks two stems. I could not find a source comparing the one-stem and two-stem systems, so the choice rests on the key.
Growing without any system leaves the plant sprawling, and a 5-stem system gives too dense a canopy for a polyhouse crop.
Tomato in a polyhouse is an indeterminate type that is trained up a string, and the number of stems left on a plant sets the plant density and yield. Pruning to two stems is a common choice and is the one the key gives.
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