One of the smaller store bought 10-15 gallon, 1GPM pump, with 3 or 4 nozzles would do ok behind a lawn tractor. Problem with anything bigger is not the battery so much as the inability of the tractors charging system. 1 GPM is less than 5 amps. 2GPM is 8 amp and 3 GPM is 11 amps. Most lawn tractors are 3-5 amp charge.
A store bought package will have all the figuring done for it. If you want to do you own you need to select number of nozzles needed for the boom (they need to over lap). Figure height above ground, and desired spray angel, GPM and such. Do the math to determin the size of pump. Off the top of my head I say you could throw toegther a 5' booom with 4 nozzles (15" apart), 1GPM pump and 30g plastic barrel and it'd work just fine.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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