Lime substitue

bondo2(11 Egypt)July 10, 2013

Hi,

I made my own self irrigated pots (like earthbox or earthainer) and and am using peat moss for medium but I have no access to lime to add to it. I am thinking of 2 alternatives but I need help:
1. Granite/marble powder
2. Crushed sea shells (just those regular shells found on the beach)

Would they work ?

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bitzppa(11)

just straight peat ?

BZ

    Bookmark   July 10, 2013 at 7:34AM
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bondo2(11 Egypt)

Peat and perlite mixture

    Bookmark   July 10, 2013 at 8:27AM
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edweather(Zone 5a/b Central NY)

You coud use gypsum for calcium, and epsom salts for magnesium, in place if the lime. What are you planning on growing?

    Bookmark   July 10, 2013 at 9:13AM
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bondo2(11 Egypt)

I like to grow mostly tomatoes, bell peppers, coriander and parsley. I don't have gypsum, how do I use the epsom with this setup ?.
I understand that lime is also to fix the PH of peat, am I correct ?

    Bookmark   July 10, 2013 at 9:17AM
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greenman28 NorCal 7b/8a

Lime = Calcium + Magnesium
Gypsum = Calcium
Epsom Salt = Magnesium

Thus, the Gypsum + Epsom Salt are required to provide both elements found in the Dolomitic Lime.

Lime does raise the pH of a mix, yes.

Josh

    Bookmark   July 10, 2013 at 11:14AM
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bondo2(11 Egypt)

How much should I add to my peat ?
Isn't granite powder the same ?
Is gypsum the same used in plaster ?

    Bookmark   July 10, 2013 at 11:30AM
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bitzppa(11)

yes same as plaster, but 99.9% of plaster used in building has additives in it to help it set etc..so I wouldn't use that for plants.

granite powder may have some K in it depending where it comes from after a quick google.

as for how much gypsum to use I wouldn't go overboard start out with the tablespoon a gallon and see how it goes.

BZ

    Bookmark   July 10, 2013 at 1:14PM
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bondo2(11 Egypt)

But all that won't fix the acidity of Peat

    Bookmark   July 11, 2013 at 6:23AM
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greenman28 NorCal 7b/8a

Do you have any woodashes?

Josh

    Bookmark   July 11, 2013 at 11:30AM
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bondo2(11 Egypt)

Not really but I have coal (wood), would that work ?

    Bookmark   July 11, 2013 at 11:31AM
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