Grain corns are the only grain I grow seriously... the other types, like rye, wheat, etc. I use for cover crops and bird feed.
Darned right on the "flavor"... it's amazing. Hickory King is one of my favorites and it doesn't seem to need near the work of sweet corn. I grow it irrigation-free.
Pros, cons and my experiences here:
http://www.floridasurvivalgardening.com/2013/08/survival-plant-profile-corn.html
For the most calories on a small space, I like sweet potatoes, white potatoes, Jerusalem artichokes, cassava and true yams (Dioscorea alata is awesome). But I do grow corn in a field plot.
The best method for me so far on the fertilization front is to take a 55 gallon drum and throw in a few shovelfuls of
chicken manure, plus some weeds, fish emulsion,
urine,
compost or whatever else I have lying around, then add water almost to the top. Every couple of weeks I'd give it a stir, grab a couple of watering cans with the "roses" removed, fill them up, then walk the rows and let it pour out between the plants as a I walk like Aquarius, the manure-water bearer.