Barley - should be registered as cropBarley.
Sunflower Seeds - should be registered as cropSunflower. (Not a derp, it's really "crop")
Persimmon - should be registered as cropPersimmon.
Turnip - should be registered as cropTurnip.
Turnip Seeds - should be registered as seedTurnip.
This stuff will allow players to use BiomesOPlenty food in HarvestCraft recipes.

Seems reasonable enough, i'll add it when I get a chance