What does the manufacturer reccomend? For my Mathews it is 5 grains per inch so for a 70 pound bow that comes to 350 grains. The arrow itself will weigh less than this becaue you have to figure in the broadhead, fletching and nock in the weight.
I think if I remeber right 5 grains per inch is a pretty standard number for all bow makers. I beleive if your arrow weight is under 350 grains tthe bow can explodeon you. I think to keep things safe I would try to get my arrow weight around 420 grains. For one your bow will be just that much quieter. I pull 67 pounds on my Hoyt and my arrows weight 450 grains and it sounds like a truck hitting a wall when the arrows hit their mark.
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.