Hay is usually computed as tons per acre. It can take a lot of fertilizer to produce decent hay. For example, soil analysis shows that here on my farm I need to add 60 lbs of nitrogen per acre, which works out to 600 lbs of fertilizer per acre if I use 10-10-10 fertilizer. 5 lbs nitrogen per 50 lb bag of fertilizer means I need 12 bags at $18 or $216 per ACRE. That is not cost effective for me since I can buy hay for $4 a bale currently and not have the cost or upkeep of the equipment. But all these figures vary widely from farm to farm, so it is impossible to compute a hypothetical with any kind of accuracy. Then of course there are the vagaries of weather--too much rain, not enough rain, extreme heat, too cool a season. Sometimes I think it's a wonder anything grows at all.
HTH
Rusty
(edited because I cannot type!
)
HTH
Rusty
(edited because I cannot type!

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