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Whats in fertiliser?

  • 15-08-2013 5:58pm
    #1
    Username John
    Closed Accounts Posts: 4,237 ✭✭✭


    Maybe this is a very stupid question... but I'll ask it anyways... ;)

    Take any compound fertiliser, lets say 18-6-12 - this is 18% N, 6% P and 12% K.

    So that's 36% - whats in the remaining 64% ?

    For intensive guys who put out a lot of fertilser - I can see why they would use straights like CAN or Urea, assuming they also use some compounds to top-up the P&K.

    But for people who put out minimal fertilser, would it not be more cost effective to always put out compounds? (maybe this is what people do, I don't know?)

    I don't use much fertilser (and a soil test has shown that I an very low in P)
    I got some 0-16-0, but now I am wondering why I didn't get 18-14-14, as it would seem to be better value for money... :confused:


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