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Old 10-06-2011, 03:14 AM #1
Manijahtor
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Post Soil mix

hello amigos! my english is no good but i wanted to hear opinions & critics about my mix.
im from argentina (south america) & been growing for 4 year, here we have great quality soil, the thing is that i noticed a few differences in the mix between countries, lets hear your opinions

30% worm castings
20% river undertow
20% compost
20% mix of peats (sphagnum & blonde)
10% vermiculite

+plus some oriental sand

then i add the fosforrus: 1spoonfull of fish flour and another spoonful of bat-guano in 8-9 litres of soil mix (for flowering i add another spoonfull of bone meal which it composts during flowering and starts giving "real" food after 1 month when guano is over)

i use the same mix in flowering but i add the potassium: 1spoonfull of wood ashess every 5 litres of soil mix

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Old 10-06-2011, 06:20 AM #2
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I think you would do well to add some "dolomite lime" to your mix since you are using peat in your mix.

I think you should visit this site
https://www.icmag.com/ic/showthread.php?t=53792
and follow one of the recipes on the first page. LC#1 or LC#2 for soil mixes. then below that you can read about different ways to fertilize your plants.
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Old 10-06-2011, 07:24 AM #3
Manijahtor
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thanks for the advice bro! but i really dont think its necesary to use dolomite, the worm casting neutralizes the peat, plus the ashes are very alcaline.
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Old 10-06-2011, 01:22 PM #4
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If it's working good for you...Cool.
I'm guessing about what the "undertow" is. River bottom?
Sounds like a lot of possible essentials along with a lot of fine material.
With only 10% vermiculite, I wonder about aeration and perched water.
Rather than change a mix that is working, adding a wick might be an idea. I would consider upping that 10% to 20 or 25% using rice hulls, pumice, diatomaceous earth, and char.
The wood ashes...I use eucalyptus, which has a high p content. They say on here to use corn cob or I think grapefruit or cucumber skins turned to ash. I soak mine and use the water. It still leaves some salts if not boiled down though. Not sure it makes any difference other than keeping the soil cleaner on the hands.
Again consider the dolomite. Cheap and doesn't contribute heavily to the alkalinity of your soil as I understand it. Being more of a buffer, it's more of an insurance policy.
Interesting to hear what you're using.
I hope the law's being good to you guys down there. I imagine the weather is. Good outside growing?
Look forward to the day when we can trade legally.
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Old 10-06-2011, 02:23 PM #5
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thanks for the advice bro! but i really dont think its necesary to use dolomite, the worm casting neutralizes the peat, plus the ashes are very alcaline.
FAIL!
Dolomite also provides much needed calcium and magnesium.
If you know your recipe works, why come here and ask?

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Old 10-06-2011, 02:54 PM #6
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The cal/mag might well be coming from the undertow. While we might form opinions of possible problems, he hasn't expressed any.
Even the earthworm castings should vary depending on local soil conditions and the eating habits producing the scrap. Compost for that matter. We don't know the mineral content of the water. The reason it's not sold at my local Lowe's is that people here don't use it unless they're growing pot in peat. With our local water and our local soil it becomes redundant.
Grapeman may have an opinion on alkaline water with high mineral content along with the use of dolomite. River water be nasty. LOL
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Old 10-06-2011, 03:51 PM #7
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Our plants need lots of magnesium. Some strains more than others.
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lets hear your opinions
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Old 10-06-2011, 04:00 PM #8
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The undertow, which I'm going to guess is comprised of the Andes, may or may not provide much in the way of Ca and Mg. I think that those particular elements, as most often found in rock, are rather easily eroded away by water, so the undertow could also be comprised primarily of silica, or volcanic or granitic or other igneous origin rocks. Dolomitic lime is comprised of compressed coral skeletons that have not been transformed except by time and pressure/weight (non-volcanic).

I should call a geologist friend to learn more.

I personally think that mix could use a larger proportion of compost, especially in relation to the peat and castings.
Quote:
Originally Posted by Manijahtor View Post
thanks for the advice bro! but i really dont think its necesary to use dolomite, the worm casting neutralizes the peat, plus the ashes are very alcaline.
That's not the only purpose of the dolomitic lime. It provides a huge amount of Ca and Mg as well as good trace elements. It's also much better for buffering than wood ashes are (and they don't provide much in the way of Ca or Mg).
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Old 10-06-2011, 04:30 PM #9
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yea what is river undertow?
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Old 10-06-2011, 09:13 PM #10
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River undertow?

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yea what is river undertow?
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