How to correct twin disc pattern cock-up?

Discussion in 'Cropping' started by Feldspar, May 3, 2016.

  1. We have gone much, much more to liquid. But still have 210t of Nitram in the shed.
     
  2. Badshot

    Badshot Member

    Location:
    Kent
    What are the lighter areas?
    Looks a lot like my osr did the first year I got my 28 m slug pelleter.
    The pellets didn't reach so had stripes on between tramlines that were thin.
    Showed up dramatically.
     
  3. Winter barley brackling over.
     
  4. Flat 10

    Flat 10 Member

    Location:
    Fen Edge
    Surely you could see that at harvest from the combine? No need for satellite.........
     
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  5. ajd132

    ajd132 Member

    Location:
    Suffolk
    No we melt urea down into liquid sometimes depending on price. We did try and spin abit to 36 about 3 or 4 years ago but wasn’t very good.
     
  6. jh.

    jh. Member

    Location:
    fife
    I think machines should be supplied with trays so an operator can test himself . It's fine having the guy out but batches could change. Kuhn have a guide to follow in the manual how to do tray tests but don't know if other brands of spreader manuals show this? 20180510_215230.jpg 20180510_215247.jpg 20180510_215421.jpg


    I've got a vicon coming this spring so tray tests are something I'd like to learn to do properly .
     
    Last edited: Feb 14, 2019
  7. jonnyjon

    jonnyjon Member

    All you need is a spreader with inward spinning discs, no trays needed in my experience, quad overlap, basically fool proof. I foolishly bought an Amazone, used to have a lely, worst machinery mistake ever
     
    Last edited: Feb 14, 2019
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  8. Brisel

    Brisel Member

    Location:
    Dorset
    What machines spin inwards? Bogabelle? Very high disc speeds and short vanes on those.

    @Feldspar - just get a professional tray tester out every year. For what you spend on fertiliser and your valuable management time analysing the process, you'd have comeback on someone if stripey plus you'd have peace of mind.

    Here's what the wrong setting does at 30m. I tray tested and the operator then set the vanes to 24/48 instead of 18/48 as tested. OS24/48 Amazone discs... :banghead: I corrected it with liquid fertiliser by changing the nozzle sizes across the boom. The f***ing image is still saved for posterity on Google Earth! Luckily I've had 2 more images since then. The bare soil strips are newly established covers next to beetle banks.

    upload_2019-2-14_17-48-50.png
     
  9. Who thinks this is an acceptable tray test? Good enough or not? Readings taken at 0m (I), 3m (II), 6m (III), 9m (IV) and 12m (V)(didn't have five collecting things). Readings on the (non-linear) scale were I - 8.5, II - 8.5, III - 8.5, IV - 9 and V - 9.5.

    This is better than I have got before, but it's still not perfect. 11% difference between high and low.

    20190214_153559.jpg
     
  10. Clive

    Clive Staff Member

    Location:
    Lichfield
    Why do you use solids when you have capability for liquid ? 11% out on the most important input wouldn't be acceptable to me ......... and that's before wind etc
     
    JRA likes this.
  11. Because we are slowly ramping up liquid use each year. This year we are majority liquids, but doing solid on OSR for logistics reasons and Nitram on wheat as a last dressing due to sprayer pressure and scorch worries.
     
  12. Clive

    Clive Staff Member

    Location:
    Lichfield
    I would rather risk a bit of scotch than 11% variation

    In reality scotch isn't really a problem if you understand the situations and limitations of equipment where it can happen
     
  13. charlie81

    charlie81 New Member

    Location:
    South Wiltshire
    Looks perfectly acceptable to me, I doubt any further adjustment on the vanes would improve that.

    Personally I'm very happy with my Amazone spreader with its trays and self calibration system, very straightforward and would rather be able to test if myself whenever and as frequently I want than pay someone else once a year.
     
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  14. I find the vane change suggestions from the Amatron only seem to make things worse! Remember the fifth reading was the worst (not shown in the picture).
     
  15. Fuzzy

    Fuzzy Member

    Location:
    Bedfordshire
    I used to get results like those and found it difficult to correct, it was always over throwing the product, but by reducing pto rpm from 540 to 510/520 it is spot on! Amazone ZAM. @24m
     
  16. charlie81

    charlie81 New Member

    Location:
    South Wiltshire
    Probably wrong discs overthrowing. I had this problem using the V3 discs on 24m trams. V2 discs solved the problem. This is on a ZA-M.
     
  17. Interesting. We run ours at 720rpm on the hydro machine. Could always wind it down. SCS are coming on Monday so need to resist the urge to do some spreading before then.
     
  18. We have OM 24-36m discs. What does V3 and V2 refer to?
     
  19. charlie81

    charlie81 New Member

    Location:
    South Wiltshire
    The V3s are supposed to cover trams between 24 and 36m and the V2s 18-24m I think. Just remembered, my model is actually a ZA-V not an M.
     
  20. It's always a bit confusing though because slowing the discs down can actually make it put more at 12m rather than less.
     

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