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16L Knapsack - How much Gallup/Roundup?

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  • 21-05-2014 2:28pm
    #1
    vicwatson
    Registered Users Posts: 28,403 ✭✭✭✭


    How much gallup /round up should be used in a 16l knapsack sprayer before diluting it with water?


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    #2
    Gerobrien25
    Registered Users Posts: 52 ✭✭Gerobrien25


    its normally 90 ml for 4.5L which is 320 ml for 16 L. The ratio is 20 ml per 1L


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    #3
    prospect
    Registered Users Posts: 4,791 ✭✭✭prospect


    I use half that myself, the concentration is determined by what you are spraying. Are you doing just normal domestic stuff (around hedges, driveway edges etc) or are you spraying off a meadow?

    I put 150ml roundup into a full 16L sprayer (domestic spraying).
    Spray on a dry bright day (no wind).
    After 7-10 days the weeds start to wilt.
    After 14 days almost everything is completely dead.


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    #4
    vicwatson
    Registered Users Posts: 28,403 ✭✭✭✭vicwatson


    Just domestic spraying thanks


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    #5
    Fred Swanson
    Closed Accounts Posts: 21,730 ✭✭✭✭Fred Swanson


    This post has been deleted.


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    #6
    Shaunoc
    Registered Users Posts: 521 ✭✭✭Shaunoc


    I'm just in the door from doing 3 * 16 litre packs. I went for 100:1 ratio. 160 ml. And then a small drop for luck


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    #7
    prinzeugen
    Closed Accounts Posts: 2,891 ✭✭✭prinzeugen


    Going by the recommend rates, I use -

    20ml per litre for spraying at 4l/Ha
    30ml per litre for spraying at 6l/Ha.

    So you need 320ml - 480ml in a 16l sprayer.


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    #8
    prinzeugen
    Closed Accounts Posts: 2,891 ✭✭✭prinzeugen


    Fred Swanson wrote: »
    Bump. What is the maximum concentration that can be safely used? I use 200ml to 10 litres to kill very tough weeds.

    Maximum rate for would be 300ml to 10 litres. This and the rates above are for roundup. That strength can kill even Ivy if sprayed on the underside of the leaf.


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