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Herbicide residues?

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  • 19-06-2021 3:26pm
    #1
    gozunda
    Registered Users Posts: 18,996 ✭✭✭✭


    Anyone one know what pre harvest herbicides are normally used on rapeseed?

    I know glyphospate is often used- anything else?

    Got a load of the rapeseed straw as bedding year previously. The used bedding was then composted but when spread seemed to kill or cause slow grass growth in effected areas.


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    #2
    Dinzee Conlee
    Registered Users Posts: 2,140 ✭✭✭Dinzee Conlee


    gozunda wrote: »
    Anyone one know what pre harvest herbicides are normally used on rapeseed?

    I know glyphospate is often used- anything else?

    Got a load of the rapeseed straw as bedding year previously. The used bedding was then composted but when spread seemed to kill or cause slow grass growth in effected areas.

    Just googled this, and found this

    https://projectblue.blob.core.windows.net/media/Default/Imported%20Publication%20Docs/Bedding876_180925WEB.pdf

    “ If using oilseed rape straw, consider where the manure is going to be spread afterwards and check which herbicides, if any, were applied to the crop the straw
    came from. If the active ingredient aminopyralid remains in the manure, it can affect crops on the land where it is spread.”

    Edit : I know nothing more than that google...
    That aminopyralid seems to be powerful stuff though, lot of info about on that when you google it...


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    #3
    Waffletraktor
    Registered Users Posts: 2,424 ✭✭✭Waffletraktor


    It's more likely something used in spring to clean out grass weed. Ask the source farm what was used in spring 2020, some things have a 6 month period they'd affect grasses.
    aminopyralid is used in likes of forefront for bl weeds in grass.


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    #4
    newholland mad
    Registered Users Posts: 326 ✭✭newholland mad


    gozunda wrote: »
    Anyone one know what pre harvest herbicides are normally used on rapeseed?

    I know glyphospate is often used- anything else?

    Got a load of the rapeseed straw as bedding year previously. The used bedding was then composted but when spread seemed to kill or cause slow grass growth in effected areas.
    Astrokerb is your problem. Straw needs to be chopped and remain in the field.


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    #5
    Waffletraktor
    Registered Users Posts: 2,424 ✭✭✭Waffletraktor


    newholland mad wrote: »
    Astrokerb is your problem. Straw needs to be chopped and remain in the field.

    Would they use propyzamide in early spring, usually end of the year thing to get the best out of it?
    6 months residuals though.


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    #6
    newholland mad
    Registered Users Posts: 326 ✭✭newholland mad


    Waffletraktor wrote: »
    Would they use propyzamide in early spring, usually end of the year thing to get the best out of it?
    6 months residuals though.

    True. But always hear its a no no to bale after. Sometimes on rented land the temptation is to much for some lads or in cases lack of knowledge of the different products restrictions


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    #7
    gozunda
    Registered Users Posts: 18,996 ✭✭✭✭gozunda


    Thanks all. As per a number of suggestions above - I think we've identified the problem. It looks like the rapeseed straw had aminopyralid residue. We had originally put down the poor growth due to the very wet spring followed by dry conditions

    To note 2 years ago a number of areas were over-sowed with clover seed spread with slurry. Aminopyralid is known to be particularly toxic to clover. We've double checked and Its the areas subseqently spread with the rape seed compost - where the clover has been effectively wiped out leaving noticeable patchy / sparser growth. Grass growth has also suffered with lower available nitrogen with the clover effectively gone. Thankfully the area affected is limited to two fields.

    You live and learn. Wont be using rapeseed bedding again...


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