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P and K

Discussion in 'Cropping' started by Dave6170, Jan 19, 2019.

  1. Much better response to nitrogen and faster regrowth after cutting/grazing.

    Sort your pH first if necessary.
    Yale and Dave6170 like this.
  2. Use the TSP.
  3. Dave6170

    Dave6170 Member

    Wick, caithness
    500kg/ha of 0 29.5 0 or 375kg/ha of 0 46 0. I just get in a mess with metric and imperial but if i use units/ac, 3cwt of tsp gives 138 units. 4cwt of scotphos gives 118 units.
    So i guess 2.5cwt of tsp gives 115 units which is a closer comparison.

  4. Just get two artic loads of P-grow, bang it on the area at the whatever rate that works out at and test again next year.

    It’s the best value P by a long way. Not the cheapest per tonne, but good value. It’ll spread 12m no bother and work in the soil quickly. TSP won’t do any good until about the next lunar eclipse.
  5. Dave6170

    Dave6170 Member

    Wick, caithness
    Is that any use for grassland? I probably wont be able to get it on untill spring time. Then there will be animals everywhere.
    Why do you say that about tsp? I ve no experience with it
  6. It’s quite well known that TSP needs a kind of conversion period in the soil before it becomes available to plants.

    It’s not a waste of time or money, but if you need some in a hurry then you need something else.

    You can use P-grow on grassland but the manufacturers do advise a grazing closure period. In my experience, most people ignore it, but I’m not advising you to do that.
    Dave6170 likes this.
  7. Brisel

    Brisel Member

    Here’s the metric calculation. 375 kg Tsp gives 172.5 kg of P2O5 at 77p/kg. 500 kg Scotphos gives 145 kg at 72 p/kg not allowing for spreading cost or the bit of K you get.
    Dave6170 likes this.
  8. Dave6170

    Dave6170 Member

    Wick, caithness
    Ive ordered powder phosphate. Just putting half the rate on just now and will see what i can afford later. Maybe a top up with tsp.
    Thanks for the advice everyone.
    Cab-over Pete and Brisel like this.

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