Astrokerb nozzle choice for thick rape

Discussion in 'Cropping' started by Wigeon, Dec 6, 2018 at 3:59 PM.

  1. Wigeon

    Wigeon Member

    What is the collective view on a nozzles for a reasonably close canopy of rape?

    Would normally go defy 3d forward and backward at 100lts, but am contemplating tti low drift at 200 lts or even 05 flat fans at 200 to get it as far down as possible. There are pros and cons of each but I'm not sure what is going to be most effective. Stuff is so expensive I don't want to waste a drop!

    What are others doing?

    Many thanks
     
  2. Mr Charisma

    Mr Charisma Member

    Location:
    stratford on Avon
    If just astrokerb then as course a nozzle as you have I would suggest and a good water rate but if you've got 1000 acres to get over you might ignore my last comment
     
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  3. B'o'B

    B'o'B Member

    Location:
    Rutland
    I would change that to say
    If Astrokerb I’d be looking at the 3D defy or GuardianAir Twins and go as high a water volume as you can cope with.
     
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  4. 7800

    7800 Member

    Location:
    cambridgeshire
    definitely not a coarse nozzle as the large droplets travel in a straight line and will be intercepted by the osr leaves.
    A fine drifty spray is needed (3D etc) to get the droplets under the leaf canopy with sideways movement of the droplets.
     
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  5. Oilseed

    Oilseed Member

    Location:
    North Cambs
    At this time of the year you only get a dryish leaf when the wind is blowing, so I would go low drift.
     
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  6. faircomment

    faircomment Member

    I will be using defy 3d’s for proline/astrokerb
     
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  7. Shutesy

    Shutesy Moderator

    Location:
    Stansted
    I used 05 Defy 3Ds @200l/ha with its angle and a light breeze to get through the canopy (y)
     
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  8. Wigeon

    Wigeon Member

    Hmm, only got 03 defys unfortunately
     
  9. Brisel

    Brisel Member

    Location:
    Dorset
    A slower forward speed and more water volume would help. I agree about using angled nozzles.
     
  10. Wigeon

    Wigeon Member

    Indeed, though I struggle to get much more than say 135lts through them at c10k before pressures get too high. Will try crawling along and see how I get on.
     
  11. faircomment

    faircomment Member

    120 l/ha with 03’s gives a nice 3 bar pesssure at 12k, I find it works well
     
  12. B'o'B

    B'o'B Member

    Location:
    Rutland
    3Ds are designed to work at lower pressure I aim for 2bar if you can cope at 10kph @120L/Ha would give a 2bar pressure or 12kpm @ 100L/Ha.
     
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  13. faircomment

    faircomment Member

    They may well be, however 3 bar gives a nice fine spray with plenty of horizontal movement giving great coverage.
     
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  14. B'o'B

    B'o'B Member

    Location:
    Rutland
    And makes them seem pretty drifty to me in all but the best conditions.
     
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  15. Gone Shooting

    Gone Shooting Member

    Location:
    hereford
    Use idtk 04s here 200l / ha
     
  16. Mr Charisma

    Mr Charisma Member

    Location:
    stratford on Avon
    I'm afraid I don't put the same faith into the 3 d nozzles in a thick crop of rape as most of you , I found it didn't have the penetrative power as a heavier droplet , okay you don't want it so course that it runs off ,
    I used a IDKT 5 nozzle because it's what I have , but it wouldn't of worried me one bit if I had a slightly courser nozzle , for the contact element of the astrokerb it's no good poncing around in the top of the canopy , if the weeds are at ground level that's were you've got to get the chemical !!!!!
     
    Andrew K likes this.
  17. Oat

    Oat Member

    Location:
    Cheshire
    Most of the action of propyzamide is residual, so the important thing is that it gets to the soil where it can then be taken up by weeds. Therefore exact nozzle choice is not too important, although angled nozzles and high water volume will help. Although you want the product to get to the soil, you also don't want it to get leached out and into water, so don't apply if ground is water logged etc...
     
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  18. Brisel

    Brisel Member

    Location:
    Dorset
    The aminopyralid in Astrokerb has reasonable residual activity too. That's why there are lots of label restrictions about treated straw & following crops. If the propyzamide works well in a thick canopy, it follows that the aminopyralid should be ok too.
     
  19. B'o'B

    B'o'B Member

    Location:
    Rutland
    I thought that was because it bound so strongly to the plant residue rather than the soil as such. I could be wrong though.
     
  20. Brisel

    Brisel Member

    Location:
    Dorset
    You could be right too..
     

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