Sprayer settings

[johnboy87]

Not touched a sprayer for over 15 years now so memory is letting me down a bit on a basic question. Dragged out our basic rarely used jarmet mounted sprayer today and I can find loads of charts online for travel speed, nozzle types and spray pressure to achive the correct rate, but none of them mention working width. Am I forgetting something here and do I need to be looking harder for one mentioning the correct working width?

Found this one in an old thread on here from @bobk (I think) but again it doesn't mention the working widthbobk

 

[alomy75]

Not touched a sprayer for over 15 years now so memory is letting me down a bit on a basic question. Dragged out our basic rarely used jarmet mounted sprayer today and I can find loads of charts online for travel speed, nozzle types and spray pressure to achive the correct rate, but none of them mention working width. Am I forgetting something here and do I need to be looking harder for one mentioning the correct working width?

Found this one in an old thread on here from @bobk (I think) but again it doesn't mention the working widthbobk

Since you can only ‘jug’ test one nozzle at a time all of the rate calculations/tables are for one nozzle. You get your l/ha result which would be possible to do with your one nozzle; but a lot quicker with a full booms worth. Either way; the total volume used would be the same. The width of spray of one nozzle is built into the calculation/chart.

 

[e3120]

^^This, because it's done on pressure, it'll be the right rate regardless of how many nozzles (working width). One proviso, though. If your sprayer is as old as mine and has 33cm spacing rather than the 50cm norm, you need to adjust the sums accordingly. You'll see the nozzle spacing at the top of the charts.

 

[johnboy87]

Cheers both of you, I thought that was the case but was having an internal debate that couldn't get past the point of "convincing myself that a change in working width should affect it as it means the area covered in one pass changes"

 

[dannewhouse]

If it's anything like our jarmet the pressure didn't match the correct output for the nozzles, (either guage was out or nozzles weren't the correct "blue" from the book.
I tested a nozzle for 1 min at a set pressure, whatever the litres per minute was I looked in the book for an application rate/speed Combination.
Think I spray at 1.2 LPM 10kph 144 L/Ha

 

[Galcam]

What are you going spraying? A few years back I bought a new 800lt mounted sprayer with 10m booms. On its arrival we tested 3 nozzles simultaneously at 3 bar pressure and the flow ranged from 1.2 to 1.9 lt per min. That was brand new so I lost all faith in cheap Turkish or Eastern European sprayers.

 

[johnboy87]

What are you going spraying? A few years back I bought a new 800lt mounted sprayer with 10m booms. On its arrival we tested 3 nozzles simultaneously at 3 bar pressure and the flow ranged from 1.2 to 1.9 lt per min. That was brand new so I lost all faith in cheap Turkish or Eastern European sprayers.

was roundup for burning grass off, would of worked out spot on if it wasn't for an ex dung heap area and badly rutted area (from the dung heap) which necessitated driving where i could and having no choice but to back off/dip the clutch a couple times

 

[ridger]

Working width wouldn't matter

 

[eagleye]

simple way to work out application rate for a basic sprayer with 0.5m nozzle spacing
measure output in litres/min at chosen presure x seconds for 100metres x 3.33 = litres/ha
been using it for 40years, takes out all the other bits.
if your not sure speed right on tractor, measure 100m and time it in the field