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Actually would be easy to do except for the control box to regulate presure. I have a unit I purchased from a company in Owensboro, KY. It was about $300. That works out to a $129 ATV sprayer, plus the $100 electrical controller, and they made $71 for profit and research on the unit plus the calibration tables. As far as preservatives to use, the only ones with a lot of impartial research behind them are based on propionic acid or buffered propionic acid (better choice, not as rough on your equipment). I used it for years, really liked it. It improves leaf retention, lets you get marginal hay up earier to avoid rain, etc. Only real disadvantages for me was care in storage (moisture will migrate out of the treated hay and if it touches untreated hay boom) and the bales get loose when the moisture migrates out. Some customers (esp equine mkt) freak out if you use it but I never had a problem selling it. Finally there is the cost issue, it adds $20-$30 a ton to your overhead and slows down baling to keep checking moisture to vary the rate of application. I quit when I went to wrapping round bales in stretch film for silage. Just no reason to put the extra effort into small squares for the acid when rolled and wrapped was netting the same profit. I still do small squares as dry hay, but if any doubt roll and wrap. Feel free to email if you have more questions.
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