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InvisibleRhizo-man
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Registered: 10/10/09
Posts: 26
Kelway pH meter + Limestone flour Q's....
    #12030484 - 02/15/10 06:12 AM (12 years, 11 months ago)

I started using a Kelway pH meter for measurement.  I need some tips on using it properly - I have no manual (it was not new but lightly used previously).  It is the model that does % RH as well as pH. 

1) I insert the meter and get a reading instantly - but if I let the meter sit in material (casing) for an hour or two the reading drops (from 6.5 then goes to 5.5 in 2 hrs)  Do I go with the initial reading or the prolonged reading?

2) I prepare casing in large (50 gal+/-) amounts.  I pretty much rely on pH reading solely from the peat portion of the casing mixture (prior to mixing it with 50% verm + 10% coir)  Peat brought to field capacity in large amounts in large containers poses a bit a problem as the water tends to percolate to the bottom of the container.  I get lower pH readings from the water logged peat at the bottom of the container, and a higher pH in the "drier" peat on top. (My tap water is 6.2) I also get a 3rd different reading when I re-mix the entire container of peat into a homogeneous mixture (in terms of hydration).  What numbers can I rely on for indication? 

3) Is the Kelway meter designed to take an accurate pH reading of liquids?

I just mixed my peat with 10% powdered limestone, 4% oyster shell flour and 1% gypsum - the highest pH out of all my types of readings has been 6.5 on this mixture.  I know hydrated lime is the way to go but for now I must rely on what I have. - Leads me to next question:

4) Given 6.5 is what I get at the percentage calcium additions I currently have in it - can I get away with adding more powdered limestone to try to get a higher initial pH??  10% powdered limestone, 4% oyster shell powder, 1% gypsum in there now - how much more of each (if any)can I get away with putting in my mix??

Just for the record I have had decent results with a 50/50 peat-verm mix with 5% limestone flour added.  By 5% I mean 5% of the volume of peat only - then mix this 5% into the peat only prior to mixing with the verm.  Thanks for reading.


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Invisibleavorg
Quixotic
Folding@home Statistics
Registered: 12/02/04
Posts: 1,348
Re: Kelway pH meter + Limestone flour Q's.... [Re: Rhizo-man]
    #12030656 - 02/15/10 06:46 AM (12 years, 11 months ago)

1 - wait a few minutes and then read it

2 - you want the homogeneous reading

3 - confusing question. it needs a certain amount of moisture to take an accurate reading, but is designed for gardening purposes.

4 - hard to say. probably the best thing you can do is separate a quart and test it. try adding a certain percentage of oyster shell or gypsum, and see what it does. this should give you a better idea of what percentage to add to the whole lot. hydrated lime is ok in small doses.


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InvisibleRhizo-man
Stranger

Registered: 10/10/09
Posts: 26
Re: Kelway pH meter + Limestone flour Q's.... [Re: avorg]
    #12030698 - 02/15/10 06:53 AM (12 years, 11 months ago)

Thanks for the reply.  My 3rd question: To clear that up - I was trying to figure out if the meter is suitable for reading the pH of liquids (i.e. can I use the meter to test my tap water)

Your answer to my fourth question is obvious but brilliant - that had not crossed my mind.  Thanks!


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Invisibleavorg
Quixotic
Folding@home Statistics
Registered: 12/02/04
Posts: 1,348
Re: Kelway pH meter + Limestone flour Q's.... [Re: Rhizo-man]
    #12030739 - 02/15/10 06:59 AM (12 years, 11 months ago)

no problem. I think it should be accurate for liquids, but don't quote me on that.


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InvisibleRhizo-man
Stranger

Registered: 10/10/09
Posts: 26
Re: Kelway pH meter + Limestone flour Q's.... [Re: avorg]
    #12035831 - 02/16/10 03:34 AM (12 years, 11 months ago)

Just to finish this thread, it took 25% powdered limestone and about 8% oyster shell flour to bring it to 6.7 pH.


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OfflineKelway
Stranger
Registered: 02/27/10
Posts: 1
Last seen: 12 years, 10 months
Re: Kelway pH meter + Limestone flour Q's.... [Re: Rhizo-man] * 1
    #12106200 - 02/27/10 02:13 PM (12 years, 10 months ago)

Dear Rhizo-man, Please contact Kelway@cybernex.net, with your mailing address and we will send you a set of instructions and some Kelway Conditioning Film for your Kelway tester. We will also be happy to go over the operation of the tester with you. Thanks, Kel Instruments


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