I don't have any experience growing grains- just a bit of book knowing.
Barley makes a sweeter tasting bread (so do oats) & it should be allowed to get completely ripe & dry b4 harvesting, but oats shouldn't. Barley will grow on worse soil than wheat & stand up to the cold wet.
Oats grow best in damp wet 'acid' land, i.e. Scotland, but hard wheat loves hot & dry, & soft wheat prefers temperate climates, though both grow best on heavy loam or clay. Rye loves dry cold sand.
There's an old saying, "sow wheat in mud & barley in dust."
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