Onions: Commercial Vegetable Recommendations (E1307)
The average yield of U.S. No. l pungent yellow onions in Michigan is 16.5 tons (660 50-lb bags) per acre. With irrigation and good cultural practices, it is possible to obtain marketable yields of 20 to 25 tons (800 to 1,000 50-lb bags) per acre.
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Marketable yields from sets will normally be lower because of shorter growing period, less uniform growth, and a higher percentage of grade out. Yields of sweet onions from transplants are similar to yields from seeded onions. However, because of poor storability, marketable yield decreases rapidly after harvest.