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Amazon Shop for: Agar, Coir, Oyster Shell, Peat, Scales, Vermiculite, pH Test Strips

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Offlinerobbster
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Casing With Oyster Shells...
    #3396171 - 11/23/04 12:43 AM (12 years, 4 months ago)

Is it necessary to add Hydrated Lime(or calcium carb.) to the casing or can AFOF use just the oyster shells?


--------------------
- Robb

"This is the trip, this is the best part."
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Invisibleagar
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Re: Casing With Oyster Shells... [Re: robbster]
    #3396189 - 11/23/04 12:48 AM (12 years, 4 months ago)

Casing material pH & why it is important.

"pH", is a measure to describe the acidity of a medium. pH 7 is neutral; higher means alkaline, lower acidic.

Peat is a major constituent of preferred casing mixes. The pH of peat is variable, dependent on the source it came from. Meaning, the pH of peat differs from various sources.

The optimal pH range of a casing mixture is 6.5 to 8. Peat is acidic. Consequently, to achieve an optimal pH range of a casing mix, the pH of the casing mixture must be adjusted accordingly (within the range of 6.5 to 8).

It is generally easier to make casing materials more alkaline (i.e. increasing the pH) than it is to make them more acid (i.e. reducing the pH).

A movement of 0.5 is easy but, because the pH scale is logarithmic, a movement on the order of, 2.0 points becomes more difficult because there is a factor of 10x between each full point, so pH 5.0 is actually 100 times more acid than pH 7.0.

There are several common types of lime available for use, though care should be exercised with all of the products. Lime is caustic and a skin and eye irritant and can be dangerous if misused. If you choose to use such products, carefully read and follow all manufacturer directions exactly. The major types of lime products include:

Hydrated Lime: fast acting, but not long lasting. It is very effective to produce a fast change in pH level. It is also the "strongest" form of lime generally available, and you must follow all manufacturer precautions, since your skin and eyes can be easily irritated or burned if the product is misused.

Ground Limestone: a naturally occurring type of limestone that has been ground to a fine powder. How quickly it will act to modify pH and how long it will persist depends on how finely it was ground.

Generally, ground limestone is weaker than hydrated lime, needing about 30% more to raise the pH by the same amount. It has the advantage, however, of usually being significantly cheaper than the hydrated lime, and usually woks more slowly and lasts much longer.

Mixed Lime: usually sold under a brand name. Most brands contain a variety of particle sizes to provide some immediate benefits, as well as a longer persistence. (this is often referred to as "time released" lime.)

If you wish to achieve optimal results, when adjusting pH? It is highly advisable to use litmus strips (with color chart), or acquire a pH test probe (available at most garden supply stores, under $20) to accurately test, and adjust the pH of your casing mix, prior to application.


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Offlinedmc_
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Re: Casing With Oyster Shells... [Re: robbster]
    #3396196 - 11/23/04 12:49 AM (12 years, 4 months ago)

grounded oyster shells alone are not recommended because of their low solubility in water.

Make sure your casing layer is in need of a buffering agent.

Some agents:

Chalk
Limestone Flour
Limestone Grit
Dolomitic Limestone
Marl
& Oyster Shell


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Invisiblederx
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Re: Casing With Oyster Shells... [Re: robbster]
    #3396197 - 11/23/04 12:49 AM (12 years, 4 months ago)

what casing mix is AFOAF using? Lime is a buffer used for peat based casings. If using peat, then yes it is highly advisable, but not neccisary. Fungi secrete acids and greenmold likes more acidic environments. The lime buffers the ph more basic to keep mold from hitting you around 3rd flush. I use both oyster shells and hydrated lime. oyster shells provide a tougher casing layer.


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Invisiblederx
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Re: Casing With Oyster Shells... [Re: derx]
    #3396213 - 11/23/04 12:55 AM (12 years, 4 months ago)

agar, while you provided technical information. You didn't answer his questions at all. Simply pasting information from google doesn't help too much. I'm not bashing you or anything but for a noob looking for answers, that long thing doesn't mean much to what he asked. BTW:


--------------------
better living through chemistry

OVERGROW the government!!

it's not a war on drugs, it's a war on personal freedom, ok, thats what it is.


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OfflineKingBahamut
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Re: Casing With Oyster Shells... [Re: derx]
    #3396237 - 11/23/04 01:02 AM (12 years, 4 months ago)

I'f I'm using verm/coir do I need to adjust the PH of my casing layer?


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Offlinedmc_
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Re: Casing With Oyster Shells... [Re: KingBahamut]
    #3396247 - 11/23/04 01:04 AM (12 years, 4 months ago)

In later flushes most likely. Goto wal-mart and get some pH strips.


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Offlinerobbster
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Re: Casing With Oyster Shells... [Re: dmc_]
    #3396373 - 11/23/04 01:35 AM (12 years, 4 months ago)

its gonna be a 60/40 verm. and coco coir.

Thanks for the replies so far.


--------------------
- Robb

"This is the trip, this is the best part."
-Jim Morrison

Bio:
:cig: :stash: :beer: :mushroom2: :doggystyle:

First Grow Log


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Invisibleagar
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Re: Casing With Oyster Shells... [Re: derx]
    #3396380 - 11/23/04 01:39 AM (12 years, 4 months ago)

Quote:

derx said:
agar, while you provided technical information. You didn't answer his questions at all. Simply pasting information from google doesn't help too much. I'm not bashing you or anything but for a noob looking for answers, that long thing doesn't mean much to what he asked. BTW:




So happens - I am the author, not google. Search the FAQ, I believe it is in there, somewhere, as is my old handle.

I posted it - so he could LEARN. Oyster shells are very slow acting.

You need to adjust the PH - to optimal, then - if you wish - add crushed oyster shell, to help it maintain that PH, over long term.



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Offlinerobbster
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Re: Casing With Oyster Shells... [Re: agar]
    #3396401 - 11/23/04 01:46 AM (12 years, 4 months ago)

the question is, is it necessary with a coco coir and verm. subtrate


--------------------
- Robb

"This is the trip, this is the best part."
-Jim Morrison

Bio:
:cig: :stash: :beer: :mushroom2: :doggystyle:

First Grow Log


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Invisibleagar
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Re: Casing With Oyster Shells... [Re: robbster]
    #3396460 - 11/23/04 02:04 AM (12 years, 4 months ago)

Whatever you use for casing material, you test it?s PH (moist) - first, then adjust - accordingly - trying to get it - optimal. There is no rule of thumb, as all sorts of casing material - come from differing places - all over the world & you will find - none have the exact same PH.

Walmart has a garden type probe PH tester that sells for under $20. It is a wise investment, if you want to get "casing" PH optimal.



If all you use is OPTIMAL - OPTIMAL CROPS RESULT.





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Edited by agar (11/23/04 02:13 AM)


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Amazon Shop for: Agar, Coir, Oyster Shell, Peat, Scales, Vermiculite, pH Test Strips

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