PH of dolomite lime ?

charlesweedmore

charlesweedmore

Well-Known Member
hi folks

i'll make coco + worm casts + perlite mix and dolomite lime for 2tblspn for per gallon.


the Coir has 5.7-6.5 ph and 0.2 Ec .

but i think there is a something wrong.
what is the PH rate of dolomite lime ?

i found a dolomite lime in where i live and its ph rate is between 8.5 -10 (the rate is written on the label ).

but i read "dolomite lime should have neutral ph 7 " .

the dolomite i would use is normal ?
 
Kriegs

Kriegs

Well-Known Member
Yeah, bro.. you read some bad advice. The pH of the actual dolomite lime is around 9.0. What's more important is the pH in solution (which is what your roots experience..).

And, dolomite is dolomite everywhere --- Calcium + Magnesium + Carbonate in a ratio predetermined by Nature.

Dolomite in pure solution (just water + dolomite) produces a pH of 8.4, for very complex reasons I can't explain here. The more items you mix into the solution (ie. nutrients, humic acids, etc), the harder it is for the dolomite to reach that 8.4 pH -- it's the result of "competition" among the various chemicals in the solution. That's why it is such a great growing amendment -- it captures acids that could drop your pH, but because of that chemical competition thingie in solution, it can almost never overshoot your pH to the high side. Ideal soil pH for MJ is 6.5 -- a good soil mix will be right about there, and a couple tablespoons dolomite per gallon of soil will help keep it there.
 
dirt clean

dirt clean

Well-Known Member
their are diferent kinds of dolomite lime. Dont use slaked or builders. Their ph is high. Plain reg uncooked lime is neutral. I found sveral passages that sya dolomite lime is neutral if it is the gaardeners variety while the other variety out there are extrmely alkline.

here is one passage.

A good way to stabilize soil is to use dolomite lime (calcium-magnesium carbonate). Dolomitic lime acts slowly and continuously, so soil will remain pH stable for a few months.
Using fine size dolomite lime is important, coarser grades can take a year or longer to work. You can find fine size dolomite lime at any well stocked garden supply center.
Dolomite lime has been used by gardeners as a pH stabilizer for many years. It has a pH that is neutral (7.0). When added to soil in the correct proportions, it will stabilize soil at a pH near 7.0.
When growing in containers, add one cup of fine dolomite lime to each cubic foot of soil. Mix the dry soil thoroughly with the dolomite lime, then lightly water it. After watering, re-mix it and wait for a day or two before checking the pH. When growing in an outdoor garden, follow the dolomite lime manufacturers instructions

here is another. IDK this is nly what i read. Their is another article I read in on an online encyclopodia that said neutral 7 for dolomite lime.

so idk i keeps my soil at 7 and I was using fish,
Its worth pointing out that what is sold as Dolomite lime is actually powdered dolomite rock with no heat treatment, therefore it is only neutral to very mildly alkaline. Dolomite will shift soil pH from acid to neutral, or from neutral to slightly alkaline, but not alkaline. For that you require slaked lime, which has been roasted at high temperature to drive off the acid carbon dioxide and leave the basic Calcium oxide. This is sold as builders lime, because when mixed into a paste it reabsorbs CO2 from the air and slowly sets to form limestone once more.
In many case dolomite is added to soil to provide magnesium to plants. Magnesium is an essential trace element, the chlorophyll molecule is based around a central magnesium atom.
 
Kriegs

Kriegs

Well-Known Member
dirt clean said:
their are diferent kinds of dolomite lime. Dont use slaked or builders. Their ph is high. Plain reg uncooked lime is neutral. I found sveral passages that sya dolomite lime is neutral if it is the gaardeners variety while the other variety out there are extrmely alkline.

here is one passage.

A good way to stabilize soil is to use dolomite lime (calcium-magnesium carbonate). Dolomitic lime acts slowly and continuously, so soil will remain pH stable for a few months.
Using fine size dolomite lime is important, coarser grades can take a year or longer to work. You can find fine size dolomite lime at any well stocked garden supply center.
Dolomite lime has been used by gardeners as a pH stabilizer for many years. It has a pH that is neutral (7.0). When added to soil in the correct proportions, it will stabilize soil at a pH near 7.0.
When growing in containers, add one cup of fine dolomite lime to each cubic foot of soil. Mix the dry soil thoroughly with the dolomite lime, then lightly water it. After watering, re-mix it and wait for a day or two before checking the pH. When growing in an outdoor garden, follow the dolomite lime manufacturers instructions

here is another. IDK this is nly what i read. Their is another article I read in on an online encyclopodia that said neutral 7 for dolomite lime.

so idk i keeps my soil at 7 and I was using fish,
Its worth pointing out that what is sold as Dolomite lime is actually powdered dolomite rock with no heat treatment, therefore it is only neutral to very mildly alkaline. Dolomite will shift soil pH from acid to neutral, or from neutral to slightly alkaline, but not alkaline. For that you require slaked lime, which has been roasted at high temperature to drive off the acid carbon dioxide and leave the basic Calcium oxide. This is sold as builders lime, because when mixed into a paste it reabsorbs CO2 from the air and slowly sets to form limestone once more.
In many case dolomite is added to soil to provide magnesium to plants. Magnesium is an essential trace element, the chlorophyll molecule is based around a central magnesium atom.
Click to expand...
Good points... A deep chemistry lesson is probably more than what was asked for here, but I'll continue anyway.

The high alkalinity of some "limes" is due to the oxides you mention. By high, we're talking pH 10-11 or so. No "lime" is actually neutral -- they're all on the high pH side in pure form. But, how they act on pH in soil is what we're keyed in on.

Everyone will do well to realize the importance of names when dealing with what are essentially agricultural chemicals. "Lime" is a very general name that can mean several different calcium and magnesium carbonates and oxides, some good, some bad for plants. "Dolomite" is a specific name for calcium-magnesium carbonate; "hydrated lime" refers specifically to the calcium oxide you mention. The latter is very hazardous for use by growers, as it can drive very radical upward pH shifts. It can be used in soil, but you better know EXACTLY what you're doing. Carbonate-based limes are much gentler and forgiving of mixing errors.

Like you said, small-pelletized dolomite is the way to go when creating a soil mix. If an upward pH adjustment is needed in the middle of a grow, surfacted calcium carbonate (no magnesium), also sold as ''lawn lime", is faster acting but still safe from "overshoot" on pH, and is also a good thing to have in your supply cabinet.
 
charlesweedmore

charlesweedmore

Well-Known Member
hey guys, thanks for guides.
their are diferent kinds of dolomite lime. Dont use slaked or builders. Their ph is high. Plain reg uncooked lime is neutral. I found sveral passages that sya dolomite lime is neutral if it is the gaardeners variety while the other variety out there are extrmely alkline.
Click to expand...
it is very important point mate.

ts worth pointing out that what is sold as Dolomite lime is actually powdered dolomite rock with no heat treatment, therefore it is only neutral to very mildly alkaline. Dolomite will shift soil pH from acid to neutral, or from neutral to slightly alkaline, but not alkaline. For that you require slaked lime, which has been roasted at high temperature to drive off the acid carbon dioxide and leave the basic Calcium oxide.
Click to expand...
slaked lime =hydrated lime ?

And it is the dolomite lime i could find easily :


Calcium Oxide: 30% (% Ca: 21.42)
Magnesium Oxide: 18% (% Mg: 10.80)
Zinc: 726 ppm
Click to expand...
and its ph is between 8 and 10.

they said to me it is agricultural lime . is it dolomite lime that i want ?

also grain of the that dolomite lime is 1.0 millimeter.

is it ok ?




:?:
 
Kriegs

Kriegs

Well-Known Member
charlesweedmore said:
hey guys, thanks for guides.
it is very important point mate.

slaked lime =hydrated lime ?

And it is the dolomite lime i could find easily :


and its ph is between 8 and 10.

they said to me it is agricultural lime . is it dolomite lime that i want ?

also grain of the that dolomite lime is 1.0 millimeter.

is it ok ?




:?:
Click to expand...
Yes... slaked is the same as hydrated.

As I said, "dolomite" is a very specific compound. I would find a product that specifically calls itself that. Other "limes" are likely to be the hydrated variety..

The other option which should be easy to find is "lawn lime" -- usually sold in a bag with a lawn picture on the front, and the analysis should be predominantly calcium carbonate (CaCO3) -- like 95%.
 
charlesweedmore

charlesweedmore

Well-Known Member
i bought that product.it is very cheap !
Calcium Oxide: 30% (% Ca: 21.42)
Magnesium Oxide: 18% (% Mg: 10.80)
Zinc: 726 ppm
and its ph is between 8 and 10.
Click to expand...
110 lbs is only 6 bucks :bigjoint:

i'll use it as 2 tbsp for per gallon. i am trying to do my best .


:leaf:
 
D

Dydream

Member
THe pH never goes above 7.00 for dolomitic lime.

Fine Dolomite Lime has long been a favourite pH stabilizer for gardens. It is difficult to apply too much as long as it is thoroughly mixed into the soil. Dolomite has a neutral pH of 7, and can never raise the pH above 7. It stabilizes the pH safely.
Compensate for acidic soil by mixing dolomite with soil before planting. Dolomite is a compound of Mg (Magnesium) and Ca (Calcium). Dolomite does not prevent toxic salt build-up caused by impure water and fertilizer build-up. Proper fertilizer and regular leaching (To remove soluble or other constituents from by the action of running water through the medium (soil makeup)) helps flush away toxic salts. When purchasing look for Dolomite Flour, the finest fast-acting dust-like grade available. Coarse Dolomite could take a year or more before it becomes available for uptake by roots. Improperly mixed dolomite will stratify, forming a cake or layer that burns roots and repels water.

Limestone Dolomite Fine Dolomitic Flour prilled lime - eBay (item 300381033744 end time Jan-02-10 10:11:00 PST)

Here are techinical specs on it, very HIGH magnesium, a BIG plus...
http://www.bakerlime.com/images/Prod...eets/AG-18.pdf
 
sourdiesel404

sourdiesel404

Member
Dydream said:
THe pH never goes above 7.00 for dolomitic lime.

Fine Dolomite Lime has long been a favourite pH stabilizer for gardens. It is difficult to apply too much as long as it is thoroughly mixed into the soil. Dolomite has a neutral pH of 7, and can never raise the pH above 7. It stabilizes the pH safely.
Compensate for acidic soil by mixing dolomite with soil before planting. Dolomite is a compound of Mg (Magnesium) and Ca (Calcium). Dolomite does not prevent toxic salt build-up caused by impure water and fertilizer build-up. Proper fertilizer and regular leaching (To remove soluble or other constituents from by the action of running water through the medium (soil makeup)) helps flush away toxic salts. When purchasing look for Dolomite Flour, the finest fast-acting dust-like grade available. Coarse Dolomite could take a year or more before it becomes available for uptake by roots. Improperly mixed dolomite will stratify, forming a cake or layer that burns roots and repels water.

Limestone Dolomite Fine Dolomitic Flour prilled lime - eBay (item 300381033744 end time Jan-02-10 10:11:00 PST)

Here are techinical specs on it, very HIGH magnesium, a BIG plus...
http://www.bakerlime.com/images/Prod...eets/AG-18.pdf
Click to expand...
is this 100% sure what u are saying and widely recognized cause theyres alotta controversial stuff saying the ph of d.lime is 8-10
 
May11th

May11th

Well-Known Member
If you bought dolomite then don't stress. I use 1 cup per cf with my mix of peat. Peat comes in at 4-5 ph and after dolomite and many amendments and cooing I sit at 6.7. Love dolomite in conjunction with oyster shell flour.
 
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