Al grains, as where one is in deficit they are usually substitutable. If you can't get rice, you get noodles (wheat). If you can't get affordable corn for your cows and hogs you feed wheat. If wheat is worth money you grow it instead of the grain that isn't worth growing.
Mountains of a grain never last long with 7 billion people, 1.4 billion cows, 1 billion sheep, 1 billion pigs and 19 billion chickens. Staggering numbers eh? On and we are making ethanol and biofuel too. Not to mention the Asian aquaculture project which gives us all cheap seafood.
Surely the few penny dreadfuls with fertilizer assets struggling to survive at the moment in junior land have to find appeal from larger fish sooner rather than later despite greedy directors and limited cash reserves?