Earthworks on sodic granite soils

Discussion in 'The big picture' started by Raymondo, May 22, 2012.

  1. Raymondo

    Raymondo Junior Member

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    A common soil type around here is high sodium (sodic is the term the locals use) granite soil. Such soils tend to be nutrient poor, low on organic matter and very free draining. Farmers who work such land say that earthworks (like a swale for example) are a waste of time because the soil simply collapses. Does anyone have any actual experience on such soils? If so what has been your experience?
     
  2. Grahame

    Grahame Senior Member

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    Wouldn't that just be a matter of how you construct the swales?
     
  3. matto

    matto Junior Member

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    When I was working at Mulloon Creek I saw plenty of old swales from the seventies Soil Con work that were still stable as well as small dams. They have an excess of sodium, not sure how comparable to yours ( have you done an Emerson test?) and some parts of the property show definate movement of topsoil. Most swales, including Geoffs mammoth and work Cam is implementing, has been done on fairly gradual slopes,and is still looking good.
    EDIT: just re-read you are on granite which is quite different to Mulloon.

    Have a look on google maps satelitte pictures and see what dams and such are around your area and go have a peak at how they are fairing. Andrew Curr and his neighbour are doing earthworks around Deepwater so maybe contact him.
     

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