I can relate to you what I do and why I do it.
I use raised rows for all my veggie garden including corn. I generally stagger plant 5 raised rows of 40 ft each three times one month apart for continuous fresh corn all summer. We get hundreds of delicious ears that way spread out all summer, much of it we consume fresh.
There are a couple of significant drivers in why I employ raised rows and a few other minor drivers:
1) We get "toad strangler" rains often in May from stalled cold fronts that dump 10 inches or more on the garden at a time. Without raised rows, most veggies would drown on flat surface even if you have good drainage. It does not take long in warm/hot weather for young plants to drown.
2) The second major reason I use raised rows is because it tremendously reduces my workload. With my equipment, I can and do make the rows in a fraction of the time it would require manually. In addition, I can and do cultivate the rows when needed...takes considerably less than one minute to cultivate each 80 ft + row and about the same to make it.
The raised rows are a good 24 inches wide and offer the added benefit of double planting which I most always take advantage of. I especially like to double plant beans with corn.
I don't generally need to add soil amendments once the rows are planted but if it was necessary, the raised row is a good way to concentrate and thus efficiently use amendments...and water I might add.
I find that potatoes and onions thrive in raised rows and enable easy soil management. Potatoes need to be hilled up as they grow and that is easily done with raised rows. Also, onions need to have soil pulled away from the bulbs and that also is very easily managed with raised rows. Here's my spring crop as of now...potatoes beginning to bloom and onion bulbs already 3-4 inches diameter. Each row annually produces well in excess of 200 pounds each of organic produce.
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My first corn planting this spring is just now breaking through. It will be completely planted out with corn and beans and other stuff over the next couple of months.
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