Soli slurry test is for sh*it...?

Can somebody tell me how accurate is soil slurry pH test, when you adding a destilled water which is not neutral (pH 7,0) but its going more and more acidic by the time its exposed to the air??? Is there some recounting form for different waters pH???

0 PPM water is a pH of 7.0

The electronic pens can't accurately measure pH of 0 PPM water.

If you do a slurry test it can tell you the general direction of the pH in the medium but it's not as accurate is sometimes required.

A good soil pH meter is so very valuable. It can measure liquids as well.

I already have Hanna Groline pH, EC, TDS and temp meter....

And it going lower and lower by stirring the slurry...

So slurry test says 5,5 and less and cheapo pH soil meter says 7,0 I am confused...

Bukvičák said:

cheapo pH soil meter says 7,0 I am confused...

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The cheapo's (long metal probe with the green meter on top) are garbage for pH readings. Moisture readings is all they are good for.

Renfro said:

The cheapo's (long metal probe with the green meter on top) are garbage for pH readings. Moisture readings is all they are good for.

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And the slurry test seems to me also useless, untill the water is pH 7,0 and its almost impossible. So I think maybe it could work good when I add some pH+ from Canna to destilled water to stabilize it on pH 7, but than the EC is 0,06... Does it influence the results wrong way somehow or do I get better results?

Bukvičák said:

destilled water to stabilize it on pH 7, but than the EC is 0,06... Does it influence the results wrong way somehow or do I get better results?

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Distilled water is 7.0 pH. No need to test that.

Slurry tests, runoff tests, cheap meter tests... none will reliably provide the correct answer.

Scroll up to post #2, click that link. That is the tool for the job. Make sure to poke the hole in the soil with the probe cover so you don't break the probe, it's fragile. Store it with the KCL storage solution in the probe cover. It will read liquid and soil pH.

Renfro said:

Distilled water is 7.0 pH. No need to test that.

Slurry tests, runoff tests, cheap meter tests... none will reliably provide the correct answer.

Scroll up to post #2, click that link. That is the tool for the job. Make sure to poke the hole in the soil with the probe cover so you don't break the probe, it's fragile. Store it with the KCL storage solution in the probe cover. It will read liquid and soil pH.

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I have already checked it and for me its to expensive and also not availible to send in the Netherlands. Also my grow space is around 1x3ft so still quite a big cost in compare with yielding in that space (I have made there over 100g dry stuff). I am still using the same ground Jiffy Z12, I also wrote to the company with the answer: all of our grounds are 5,5-6,5 pH and last grow in the 10th week of flower I have ran into really big problems with the soil pH. I would like to avoid this in my next round...

So my main question is how much lime do I need to add to buffer my soil for 3 Months of growing with nutricients from plagron when I do not know pH of my soil???

Bukvičák said:

So my main question is how much lime do I need to add

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Entirely a guessing game and it takes a while to have effect. May be too much, may not be enough.

Renfro said:

Entirely a guessing game and it takes a while to have effect. May be too much, may not be enough.

Medium pH Correction (Soil and Coco)

Checking and adjusting the pH of your root zone in soil or coco is a very important part of growing healthy plants. Often you will notice nutrient deficiencies despite the fact you know you have provided an ample feed at an appropriate pH level. When this happens it’s generally either...

www.rollitup.org

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If you look at the pictures above... Is it caused by salt built up...?

Bukvičák said:

If you look at the pictures above... Is it caused by salt built up...?

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It doesn't have that look, but you could test your runoff PPM and see what that tells you. If your feed goes in at an EC of 2.0 and comes out significantly higher then you have a salt buildup.

I do see a phosphorous deficiency among other possible deficiencies that could be caused by pH or just a lacking feed.

Renfro said:

It doesn't have that look, but you could test your runoff PPM and see what that tells you. If your feed goes in at an EC of 2.0 and comes out significantly higher then you have a salt buildup.

I do see a phosphorous deficiency among other possible deficiencies that could be caused by pH or just a lacking feed.

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At first I would like to thank you for your interest, I have already made a thread here one month ago, but it ended up with argumentation between two wellknown members and thats how it ends. But it left me here even more lost then I was before.
You wrote that you see deficiencies, I agree and most of the growers who answered my thread “Kindly asking for help” too. Now its necesarry to write down the background... Lets pretend my soil pH is ideal (first measures of runoffs pH was always a little bit lower than input water pH). I was growing 3 plants in soil under the 300w led light in one diy pot (35x60x30cm) from wood and geotextile inside and heating pad in the bottom. So the pot takes usaually 5 days until it dries out. I added nutricients from Plagron every watering since 2nd week of flowering (6th week from germination) in a dosage of 25%of recommended amount. Dosage was increasing every watering untill 10th week of flowering up to the 75% of recommended amount. At the beggining of grow I was adding power roots in half reccomend dose and some vitamines in the same dose. Flowers did not show any deficiencies untill that time (around 9th week of flowering), maybe some fading yellowing leaves at the bottom parts. And than, like it happened over night, one of the girls started showing light deficiencies (probably cal or mag, because I did not used it anytime I watered) and next day more and after fiive days it happens terribly. Runoff pH went to 5,5 eventhou I was watering with plein water pHed to 7,0 instead of 6,5-6,7 I did before. EC runoff was around 2.0. This “nute def” hit one of the girls really hard (on the pictures), one started showing the same symptoms day before 2 dark days before harvest so very lightly and the last one not at all.
So my conclusion is like this (and would really apreciate your opinion): they were locked out of basic nuts (NPK) because of a lack of calcium or magnesium...? Or overfertilized (soil has so much amonium based fertilizer, which caused pH soil is too low for uptake nutricients)...? I am almost sure that it is NOT ”normal” nutricient defifiency, because the leaf necrosis hits only the top bud fan leaves and started to hit also sugar leaves, but the lover leaves did not look like this. Thank you for you time.

xtsho said:

The Ultimate Soil pH Testing Guide

This all-encompassing guide will help anyone who is just starting out with soil pH testing. (And experienced growers will be able to learn something, too!)

blog.hannainst.com

How to Test the pH in Soil - from Cole-Parmer

Learn the methods to test the pH in soil by a laboratory method and by alternative testing such as for recreational gardening.

www.coleparmer.com

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I have seen and also did all of this and many more, probably the only way how to find out the really correct value of soil pH is with the pensoil pH meter from bluelab... slurry is for nothing, you can use baking soda-vinegar test and you will get the same results

Bukvičák said:

I have seen and also did all of this and many more, probably the only way how to find out the really correct value of soil pH is with the pensoil pH meter from bluelab... slurry is for nothing, you can use baking soda-vinegar test and you will get the same results

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Well it's at least much more accurate than testing runoff pH.

xtsho said:

Well it's at least much more accurate than testing runoff pH.

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Can get a little invasive, especially if you need to retest often. Generally we want a reading from soil thats at least a few inches deep. Can't imagine how the plant would like it if we kept rooting around the roots for soil samples to slurry test.

xtsho said:

Well it's at least much more accurate than testing runoff pH.

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agree

Renfro said:

Can get a little invasive, especially if you need to retest often. Generally we want a reading from soil thats at least a few inches deep. Can't imagine how the plant would like it if we kept rooting around the roots for soil samples to slurry test.

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I see your point. The only time I check pH is when I feed so if I do a slurry test it's outside in the garden.