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 Pat Browning. The setting is rural Wisconsin, halfway between East Troy and Elkhorn, on Hodunk Road, our nation was at war, and I was 6, 7 and 8 years old. George was our "threshing neighbor." He was the one with the threshing machine, a JI Case on steel wheels, and he pulled it to our farm with a JI Case standard tractor also on steel. In those days, steel wheeled implements were common. The roads were general gravel, so the lugs cutting into them wasn't a problem. George would set up the thresher, s
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