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Lukas Rohrbach

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since Jan 01, 2019
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Recent posts by Lukas Rohrbach

Hi Trace

Sandstone is an excellent building material since it is widely available and often easily workable, but as described in other posts, it can have its difficulties.

Many historical buildings in Switzerland are made of sandstone. This particular sandstones has a calcite matrix (in other words, calcite binds the sand grains together so that they form a rock). Due to this, the sandstone is very susceptible to erosion over the centuries. Other sandstones have quartz as binding material, making them very strong and hard.

Be aware that the terms Sandstone, Clay, Quarzite etc can have different meanings depending on wether you talk to a geologist, stone mason, geotechnical engineer, decorative stone vendor etc.

Maybe you could post some pictures of your sandstone occurrence, so that we can help you with a first assessment.

2 weeks ago
Hi Briant
Great list, thanks a lot! The first of its kind I see, at least when considering a supposedly representative sample size of 30 each.
1 month ago

Bryant RedHawk wrote:
For most of us, if the pH meter will read within 0.05% we are in the super accurate (for our needs) range, we can get by nicely with an accuracy of 0.2%.

+1. Remember that the pH scale is logarithmic (not linear), so between pH 5.0 and 5.5 is a huge difference, making sub-% errors insignificant.
2 months ago
Hi Ryan
I would rather look into cutting gluten, caseine, lactose, carbs and such out of your diet. There is anecdotal as well as thorough scientific evidence that a diet free of these, or some of these, helps with some mental disorders. Google is your friend, it's been ways too long since I spent time with this.
Of course anecdotal evidence "does not count", but for the individual who reaps the benefits, it well does So give it a try!
2 months ago
in relation to this old post, I found the following link:

Looks like the method of growing small forests quickly contains at least:

  • Soil amendment, 1-time digging-in of organic matter
  • Planting trees so close as that they compete for light
  • Infuse mushrooms if necesary
  • Mulching

  • Has anyone experience with imitating this method? I would love to try it with a mix of native and fruit trees ...
    2 months ago
    Acacias are said to be nitrogen fixers, since they are legumes, and I see them mentioned in this forum every now and then. I guess people are planting them as part of tree guilds. Living in Chile (mediterranean to semiarid), there is a bountyfull of trees that only grow here, lots of them draught hardy and even edible, and the local Acacia Caven is one of them. A spiny shrub, slow growing, hated by all.

    Now I have come over some research abouth the A. Cavens role in the local forests. The author found a close relationship to other young trees growing under the canopy of the Acacias, thus providing shade, humidity and maybe nitrogen. The paper then proposes that the Acacias are nurse trees for the other trees, which will eventually outgrow them.
    Of course I wrote an email to the author of the paper, who was so friendly to reply. According to her observation, the younger trees growing under the canopy of Acacia had their stems literally only centimeters away from the Acacia stem. I understand this is much much closer than the permaculturists would recommend, e.g. if you are planting a forest garden, or any sort of tree guilds. Furthermore, in her opinion, the Acacias provide mainly humidity, but there is no significant effect of nitrogen fixing

    So I am wondering: is it advantageous to plant Acacias next to other trees in general, the saplings being 5cms away from each other?

    Open link to the paper:

    2 months ago
    Hi Spencer
    How did it turn out? How much water are you getting at which humidity?
    2 months ago

    Rebecca Norman wrote:aminopyralid class of herbicides.

    Hi Rebecca, thanks for the heads up regarding herbicides! What would you suggest should I ask to find that out? I am afraid people won't have an idea ...
    2 months ago
    Great, I ll jst buy whatever and mix it up!

    I am planning to age the chips, or sort of pre-compost them for a couple of months together with horse manure. But according to the impressive mulch thread, not even that is necessary right?
    3 months ago
    Hi everybody

    I can get two types of chopped up wood comercially and use it for mulch: pine (wood only, no bark, no needles), and a local chilean oak (wood and bark).

    Which one should I choose?

    Target: plant a food forest in a mediterranean climate (chile) whith less than 100mm of rain in recent years. Poor soil, mainly a weathering granite, when lucky I have 5cms of topsoil.

    Thanks in advance!
    3 months ago