I built three raised beds 4' x 8' and one 4' x 12' nearly twenty years ago after tiring of the yearly rototilling routine and seeing plans in Kitchen Garden magazine. They were filled at the time with bulk garden soil from a nearby nursery. All I have done each Spring has been to turn the soil and rake in some peat moss. The results have been generally fair but never great - between very hot, dry weather, bugs, and other factors, we don't exactly get a bumper crop in any given growing season. After seeing square foot gardening mentioned elsewhere, I decided to remove some of the existing soil in the beds and replace it with
somewhat the same mix called for by the book: 1/3 each of compost, vermiculite, and peat moss. I actually cheated and bought several bags of 'Kellogs Garden Soil', which was mentioned as a good alternative on a
video, plus a large bag of vermiculite. I've always just used a watering can but may go ahead with drip irrigation as well; I think the watering has been a major source of some of our problem tomatoes in years past.
Anyone had good luck with this? I'll put up some pics depending on how things go. :)