Permaculture Literacy – HHA

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9 Comments

  • candace caines says:

    What can be done to avoid building up salts in a polytunnel? Should we flush it every so often?

    Reply
    • Bret James says:

      A few things:

      1) Choose a location that has good drainage
      2) Avoid excessive fertilizers or fertilizers that have salt
      3) Don’t use soften water for irrigation
      4) Add lots of compost / organic matter

      Have you tested your soil yet? Simply keep an eye on it and if it is not a problem just do the above.

      Yes you could irrigate to leach salts out of the soil to mitigate it but it could take 3-6″ of water to do so. It’s better to manage the tunnel well before it becomes an issue.

      Reply
      • candace caines says:

        I used a lot of animal manures and diluted urine last year. oops. if I pile a couple feet of snow on it in the spring should it help?

        Reply
  • Patrick Sant says:

    Are high tunnels the same as poly-tunnels?

    Reply
    • Bret James says:

      In this context yes, a high tunnel is just a long green house where plants are grown in ground (versus in pots in a green house). Most high tunnels are made from a poly material, hence the other name that we sometimes uses, poly-tunnel. But I’ve made small poly-tunnels aka Hoop Houses (which are small and you can not walk in like a high tunnel).

      Reply
  • Sophie Craggs says:

    hmm… I wonder if an early season coldframe could double as a solar oven in the peak summer months..

    Reply
    • Bret James says:

      Love the way you are trying to stack functions Sophie 🙂 I haven’t tried but maybe? Solar ovens use insulation and black surfaces to achieve the temps they do whereas cold frames do not have those characteristics. Throw a thermometer in one this summer and give it a try!

      Reply
  • susan tupper says:

    in the tropics, I won’t be needing green houses but shade houses to keep off the heat – do you have info on these sorts of structures? I know many just don’t bother to grow lettuce or spinach cos they will just seed but I want to try cos I like to eat them 🙂

    Reply
    • Bret James says:

      Bill Mollision’s Permaculture Designers Manual has some sketches but you can also google “high tunnel shade cloth” to see how people are using high tunnels for shade.

      Reply

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