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Potash query

  • 28-05-2025 11:34PM
    #1
    Seadin
    Registered Users, Registered Users 2 Posts: 2,091 ✭✭✭


    Hi all,

    Looking for a bit of advice on fertiliser. I am cutting my field of 4 acres for first cut silage in about two weeks weather permitting. Once this is done I will be using the field again to produce 2nd cut silage. I applied 18.6.12 fertilzer at 2.5 bags/acre so 10 bags in total for the 1st cut. I don't have any slurry available to spread on field after the 1st cut is finished but I was thinking of getting a few bags of potash and throw it in with the 18.6.12 fertiliser.

    If I were to throw out 2.5bags of 18.6.12 again per acre. How many bags of potash could I throw in with that to replace the absence of slurry that this field would normally get? The field got no slurry at all this year so far.

    TIA



Comments

  • #2
    older by the day
    Registered Users, Registered Users 2 Posts: 2,443 ✭✭✭older by the day


    I think the potash you will be spreading is 50%, they advise up to 100 units for silage. The 18.6.12 at 2.5 bags has 30. So a bag and a half per acre.

    Now 2.5 bags of 18.6.12 for the first cut was light, in N as well so you may as well throw in a bag of CAN or 27. 2.5.5 as well..

    That's for a heavy crop,

    If I'm wrong the lads here, won't be long correcting me.



  • #3
    Conversations 3
    Registered Users, Registered Users 2 Posts: 788 ✭✭✭Conversations 3


    Id add a bag or bag and a half of MOP as well.

    Your K must be very low after the first cut.

    Have you soil samples?



  • #4
    morphy87
    Registered Users, Registered Users 2 Posts: 1,641 ✭✭✭morphy87


    I spread potash last Autumn on a field that was very low in K and so far this year I’m seeing great results



  • #5
    Seadin
    Registered Users, Registered Users 2 Posts: 2,091 ✭✭✭Seadin


    If I mixed 18.6.12 with Pasture sward and potash what would be the expected results?I be more interested in the condition of the ground after cutting. I want to leave the field in a good condition for the future. I have that fertiliser available at the moment without buying additional fertiliser.

    I was going to put 4 bags of 18.6.12, 6 bags of pasture sward and 5 bags of potash. Mix it all up and spread. The ground las low N as it is this year so far.



  • #6
    J.O. Farmer
    Registered Users, Registered Users 2 Posts: 2,585 ✭✭✭J.O. Farmer


    How much ground are you looking to cover. That can't be per acre or even per hectare. The cost alone would prevent it nevermind the amount of fertiliser being more than would be allowed.

    18:6:12 and pasture swart are the same thing just a different ratio of N:P:K. There's more N and less P and K.

    If you're ground is lacking in P and K 18:6:12 will be better to build them up. The Potash will bring up the K.

    I also don't think you would be able to properly mix fertiliser types so different parts of the field would receive different proportions of each fertiliser.



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  • #7
    older by the day
    Registered Users, Registered Users 2 Posts: 2,443 ✭✭✭older by the day


    https://www.boards.ie/discussion/comment/123496081#Comment_123496081

    The better farmers here, would be sweating at your suggestion. Because they say you should soil sample, and correct your K in Autumn and then straight urea for silage. It would be cheaper and you can find out so you need much P&K you need.

    So try and make it simple, you have 4 acres, so you are spreading roughly 60N 10p 74K per acre. If you have it throw it out.



  • #8
    Seadin
    Registered Users, Registered Users 2 Posts: 2,091 ✭✭✭Seadin


    https://www.boards.ie/discussion/comment/123496411#Comment_123496411

    The way I mixed it before was by putting one bag of one fertiliser on one side of the spreader and another bag at the other side of spreader and open a corner of each bag slowly and then rotate the next bags on opposite sides of the spreader . The shaking in the field etc would gradually mix it up. Not ideal but it worked away fine for me.



  • #9
    Seadin
    Registered Users, Registered Users 2 Posts: 2,091 ✭✭✭Seadin


    I have a pallet of pasture sward and only 5 bags of 18.6.12 in the yard right now to use. I have just 4 acre field to cover. I want to have 2nd cut silage there as well. I don't have slurry for it for 2nd cut so wanted to put something on effectively to replace the slurry. Soil samples done a few ago and had too much p content.



  • #10
    Jb1989
    Registered Users, Registered Users 2 Posts: 2,744 ✭✭✭Jb1989


    Only 4 acre I'd go out separately with both of you were unsure about mixing.



  • #11
    Mr..
    Registered Users, Registered Users 2 Posts: 113 ✭✭Mr..


    Screenshot_20250331_063653_Chrome.jpg

    Above is what's recommended, think it's from am agri land article.



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