The other comment is probably right, that this varies widely, but getting a vague order of magnitude is still useful. From some amateur googling, it seems that an acre requires on the order of 100 lbs/year (50-300lbs, though the higher figures seem to also include things other than just nitrogen/ammonia).

So 1 ton/day (assuming metric tonnage), would be in the range of 8000 acres/year, though with obviously large error bars.