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Nitrogen allowance calculation

  • 09-08-2025 11:07AM
    #1
    tellmeabit
    Registered Users, Registered Users 2 Posts: 1,112 ✭✭✭


    Hi all,

    Hope to get a bit of fert in yard and out this week coming but want to reassure myself I won't go over allowance, no harm to know how to calculate it correctly going forward either.

    Have asked the advisor to do it up but no idea when he will come back to me.

    Anyone have an app or excel sheet that can do the calculations?

    When did the green cert I remember doing this on an Excel sheet.

    What do you all do to calculate N and P ?



Comments

  • #2
    alps
    Registered Users, Registered Users 2 Posts: 5,306 ✭✭✭alps


    Here's the N one.

    Overall stocking rate and the corresponding colum

    1000046019.jpg

    with the kg of N allowed per hectare.



  • #3
    dmakc
    Registered Users, Registered Users 2 Posts: 1,337 ✭✭✭dmakc


    https://www.boards.ie/discussion/comment/123710764#Comment_123710764

    Just to note the dept bases this off last years stocking rate, not this year's.. which is counter intuitive imo



  • #4
    Dickie10
    Registered Users, Registered Users 2 Posts: 4,110 ✭✭✭Dickie10


    I threw everything into chat gpt it gave a ballpark figure at least b it replied to me unlike Teagasc advisor a few months back



  • #5
    Dickie10
    Registered Users, Registered Users 2 Posts: 4,110 ✭✭✭Dickie10


    I’d say that’s what Teagasc and dept do as well get ai to calculate



  • #6
    older by the day
    Registered Users, Registered Users 2 Posts: 2,599 ✭✭✭older by the day


    https://www.boards.ie/discussion/comment/123718130#Comment_123718130

    Is that a big job dickie

    If you have the time, you might list out the steps, or anyone else here.

    I just go on what I on the figures I was told three years ago.



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  • #7
    older by the day
    Registered Users, Registered Users 2 Posts: 2,599 ✭✭✭older by the day


    What is the penalty for exceeding the allowance, anyone know



  • #8
    tellmeabit
    Registered Users, Registered Users 2 Posts: 1,112 ✭✭✭tellmeabit


    After a bit of reading online have come up with the following:

    Nitrogen allowance = last years grassland stocking rate X no of HA in this year's BISS.

    So, got the grassland NPH from my agfood nitrates statement from last year. Mine is 122kgN/HA . Looked up the different bands of allowance.

    Im I'm the 86-130 range, which means that I am allowed 90 kgN/ha.

    Multiply this 90 by the number of HAs I submitted. And I get 2086 kg N.

    Then looked up my nationalfertilizer database transaction for this year on agfood.ie

    This gave me the kgs of NPK I had purchased during the year. It didn't include the few bags I ordered last week. So I added that to my total.

    Able to calculate how much I have left over for rest of year and the figure I will need to submit to stay in line with the total when I submit my closing balance later this year.

    The p usage is also shown but you need to take into account the soil test results to make up that figure. Will be putting into an excel sheet for future years

    Look up last year's



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