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Thread: Make Your Own Ericaceous Compost

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    Dynamite's Avatar
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    Default Make Your Own Ericaceous Compost

    Hi everyone, I have a quick one. I want to make my own Ericaceous Compost but not sure how.

    Any advice? What are the ingredients?

    Kind Regards.............Rob

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    I just got a load of spam on that wep site ! don't click on to anything on there ! Dal.

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    Cut n paste - Dal you might want to check your browser / pugins - loaded up ok for me but on a locked doen linux computer.
    John Innes Base Fertiliser is the name coined at the John Innes Research Institute in the 1930's for a ready mixed blend of hoof and horn, superphosphate and potassium sulphate for mixing with loam, peat and grit to make John Innes Loam-based Potting Composts.

    The following lists gives the formulae for the Composts - the proportions of the substrate are measured by volume, with loam and peat passed through a 9mm sieve. For the No. 1,2 and 3 composts the John Innes base fertilizer consists of 2 parts Hoof and Horn for the Nitrogen (N), 2 parts Superphosphate for roots (P)and 1 part Potassium Sulphate (K) for flowers and fruit. This is balanced with one part ground limestone (CaCO3) to provide an optimum pH.

    For growing seeds, cuttings and ericaceous or calcifuge plants (plants which require acidic conditions) the proportions vary and for the latter the ground limestone is replaced with an equal quantity of Flowers of Sulphur which lowers the pH.

    Compost Substrate Fertilizer rates for the John Innes base are per each cubic metre of mixed compost.

    John Innes No. 1

    7 parts loam
    3 parts peat

    2 parts sand 0.6kg ground limestone

    1.2kg hoof and horn,1.2kg superphosphate

    600g Potassium Sulphate


    John Innes No. 2

    7 parts loam
    3 parts peat

    2 parts sand 0.6kg ground limestone

    2.4kg hoof and horn

    2.4kg superphosphate

    1.2kg Potassium Sulphate


    John Innes No. 3

    7 parts loam
    3 parts peat

    2 parts sand 0.6kg ground limestone

    3.6kg hoof and horn

    3.6kg superphosphate

    1.8g Potassium Sulphate


    John Innes Seed Compost

    2 parts loam
    1 parts peat

    1 part sand 600g ground limestone

    1.2kg Superphosphate


    John Innes Cutting Compost

    1 parts loam
    2 part peat

    1 part sand no added fertilizer


    John Innes Ericaceous Compost

    2 parts loam
    1 part peat

    1 part sand 600g Flowers of Sulphur

    1 part superphosphate


    Mixing is more easily performed if the ingredients are not too moist so that the particles do not stick together and so become more evenly distributed. Storage should be kept to a minimum as the nutrient balance will change due to the Nitrogen being mineralised by bacteria to unavailable Nitrate (NO3=) ions.
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    1574 gin and tonics please Monica, large ones.

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    I was hoping to make my own but looking at the above, it wouldn't be possible.

    What is Loam, superphosphate, sulphur etc and I reckon garden centres don't really sell it anyway.

    Might it be best if I just buy some ready made?

    Regards.........Rob

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    Superphosphate is a high phosphate fertiliser - available at W1lk0s
    Sulphur is elemental sulphur or Flowers of Sulphur - Garden centres often have this or ebay
    Loam - basically good soil.
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    New all singing all dancing blog - Jasons Jungle

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    ^^^brain box!
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    Yes but he's a geordie.. most likely making it up IMHO

    1574 gin and tonics please Monica, large ones.

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