I just bought 5 acres in central kentucky. what type of sprayer and herbecide do I need to kill weeds. I am mowing all 5 with a 61 inch bob cat ztr. the property is pretty flat. I found a BRAND NEW NORTHSTAR ATV SPOT SRAYER 26 gallon on ebay for $154. I also found several others cheaper, but smaller. Any input would be greatly appreciated.