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Implement Alley Discussion Forum

measureing gallon per acre for lawn sprayer

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twine

05-30-2006 07:39:19




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Hi I was wonder how you measure for how much spray you are using per acres.I think this is how this works ,but not sure it for a lawn spayer i made it has a pump that is on demand it 12 volt,and there is three nossles.So here it goes first i catch how much water one of the three nozzles for 1 minunite then times that by 2 to get what all three will do,then i measure 109 feet and time how long it take my mower at the speed i want to go to get that far. Then is there some thing to do with pressure to.I only have about 12 psi of pressure and i think i need a little more so if i get smaller nozzles will solve my pressure problem i hope.I have a wand and a gun and that has a adjustable nozzle on it and that got like 50 psi of pressure so im good there. Or im i all wrong about how we do this. thanks

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Heat Houser

05-31-2006 13:25:08




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 Re: measureing gallon per acre for lawn sprayer in reply to twine, 05-30-2006 07:39:19  
1. Determine the nozzle spacing
2. Using the chart, measure and stake the travel distance.
3. Select the gear and throttle setting.
4. Measure the amount of time it takes to travel the distance.
5. Set the pressure you will use while spraying.
6. With the sprayer stationary, (and spraying) collect water from one nozzle for the amount of time it took to travel the distance.
7. Ounces collected will be the gallons per acre that the sprayer will produce.
8. Nozzles should be within 5% of average.

Spacing/distance (inches/feet)
7/583
8/510
10/408
12/340
14/291
15/272
18/227
19/215
20/204
24/170

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JMS/MN

05-30-2006 08:15:21




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 Re: measureing gallon per acre for lawn sprayer in reply to twine, 05-30-2006 07:39:19  
If you have a known area- 1 acre, half acre, etc.- spray it with plain water at a constant rate of speed, constant pressure, etc. and measure how much it takes to refill the sprayer. Can do the same thing with a given common distance, like 1/4 mile times your boom width. Mix accordingly. Nothing wrong with measuring output of a single nozzle over a given distance, but there is more variation in dealing with a small area when dealing with the multipliers. Make notes to use next year, etc., and keep info from each time you spray. Should be consistent. Thanks for calibrating- wish everyone did.

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bjb in Ne

05-30-2006 07:55:20




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 Re: measureing gallon per acre for lawn sprayer in reply to twine, 05-30-2006 07:39:19  
First off you need to multiply the rate for one nozzle by three instead of two. That will get you a volume time rate of gallons per minute (second). Then you need to know your velocity in distance per minute (second). Last you need to know the width of spray you unit puts down. Multiply the velocity by the width to get an area rate (sq ft/min (second)). Then divide the volume rate by the area rate (it doesnt matter weither you do it in seconds or minutes just as long as both rates are the same unit). Then you have gallons per sq ft and convert this to gallons/acre by multiplying by 43,560

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