First off, it depends a lot on what the ground has been used for recently. You'd rather not plant any of those sorts of grains that share a pest or disease more than one year running, so as not to give the baddies a head start eating your crop, for one thing.
Second, what's the tilth (crumbliness, to coin a word) of the soil currently like? Heavy clay? Sandy? Or nice and loamy? Do you need a lot of lime? Wheat doesn't much like being planted on freshly-limed soil, it increases the likelihood of some diseases (google for "take-all" for one) but does like a lot of muck (manure) this season (fall, plant wheat in the late fall for a spring crop, spring for a summer crop), and some potash last year or so (not this year).
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