A wallow is a basically a mud hole, usually in or around a mountain spring, that bulls "wallow" or role around in.
I've located a lot of wallows while hunting and scounting, and I always seem to find bulls in those areas, but I've yet to ever actually SEE a bull in the act of wallowing. I think it would be a cool thing to see.
Here in Arizona, they start about August, but I have seen them earlier. If you can find one in summer, try to keep it a secret. I have seen them stop using busy one's right when the hunters start snooping around.
Let me start off by saying I am not a farmer.
I am a deer hunter and I do own a tractor and have all of the equipment - but that does not make you a farmer any more than standing in the garage makes you a car - well, you get the picture!
Having said that - and with most of my ineptitude fairly well hidden - I do think that buckwheat is one of the most under rated cover crops out there.
I say cover crop because I see mixed results as it relates to the deer eating the plants.