...Billy, this is one of those extremely rare occasions where I agree with Metakron becaue he's right.
I've no earthly idea what you're thinking but you've sure got your head screwed on backwards this time! In the BIGGEST part of the the U.S. that's exactly where most of the cow-calf operations are - on land that's too steep or hilly for row cropping or even hay production (too difficult for machinery to traverse). He was NOT talking about farmland that wasn't fertile because something was missing. Even pasture land has to be fertilized regularly - it goes away in the bodies of the calves when they are sold to feedlots.
So back up, take a deep breath, get your brain properly engaged and, like a man, admit that it was YOU that was speaking nonsense this time.
Certainly, some land IN ITS PRESENT CONDITION is suitable for some crops and not for others. For example in much of Asia, the hill sides, in their original condition, could not be used for rice paddies, but once they were terriced, they were quite suitable. It is all a question of economics.
Nothing but some space (land) is absolutely required to grow any crop. (That point I illustrated by the CEO growing grass on concrete.) If sunlight is not available, for example, with MetaKron's favorate crop, your basement is suitable for hemp growing, as artificial light can be provided, but that crop will require a high sales price to be economical.
Next to sunlight, perhaps the next most important thing is areable soil, but that can be pure SiO2 (sand) for the roots to pass thru. (Little can grow on a recent lava flow - mainly a few types of licans, mosses, etc.)
Once you have both sun and some medium for roots (even water as in hydroponics, but I think sand is used normally.) all the other requirements can be supplied chemically. (Perhaps the most commonly supplied chemical is H2O.)
Obviously, in some locations everything needed is already available. For example, in some parts of Iowa, the "TOP SOIL" is 30 feet deep and rich. Some other locations have every thing needed, but the soil is to acidic, so lime must be added, etc.
It is nonsense to say land is not "suitable" for growing some crops, but perhaps I was to harsh too point that out so abruptly. For example, it is equally "nonsense" to say oil tar sands are "not suitable" for producing motor fuel. I may have just become too annoyed at his often, wild claims. For example a few months ago someone did give a useful link that showed the biopotential of many different crops. Hemp was near the bottom of a list of about 20.
The use of land for producing crops is only a question of economics, not "suitability." My head is screwed on just fine, thank you.