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Improved runoff method for testing soil pH

pop22

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I've had the cheapest meters, and so called good meters. Then I bought a lab quality meter, an Extech PH100. 0.01 accuracy. .Price is about that of Blue Labs, but is a much better and more versatile meter. .I believe I paid $99 for mine
Info:


PH100_360.jpg



Features:

• Flat Surface Electrode measures pH in liquids, semi-solids, and
solids. No more electrode breakage or clogged junctions.

• RENEW indicator tells you when it’s time to replace your
electrode which eliminates guesswork

• CAL alert tells you it’s time to recalibrate. Ensures accuracy.

• Memory records and recalls 15 sequentially tagged readings
allowing detection of changes over time

• Analog bargraph displayed on LCD

• 1, 2 or 3 point calibration automatically recognizes buffer
solutions. Order pH buffers separately.

• Automatic Temperature Compensation

• Simultaneous display of pH and Temperature

• Display indicates when the reading is stabilized

• Data Hold, Auto power off and low battery indication

• Waterproof design (IP57) floats in water and
protects the meter in wet environment

• Interchangeable probes available for Chlorine & ORP
 

Waira

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:smoking:Shweeeeet unit Pop!... a lot of great features, especially for that price,... :thumbsup:
 

pop22

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It sure is!
You can stick the probe right into soil! I suppose you'd have to de-pot to test lower soil but it still is nice for a quick test! I actually bought it because I constantly test my water, even my RO water ( helps detect when a filter change is needed )


:smoking:Shweeeeet unit Pop!... a lot of great features, especially for that price,... :thumbsup:
 

Waira

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....soil-- indeed, a "solid"! And with that electrode design, there's no place for bits and pieces to stick and lodge into, mucking up the meter,... do they say anything about how to safely clean the electrode? You know how soupy some feeds soln.'s get! :doh:
 

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I like the cheap ph meters too, Etekcity, Dr. Meter, ect ... Some of these cheap brands are shipped with a moisture sponge, (for lack of a better word), that is usually dried up. You need to moisture them back up before attempting to remove particles from the probe area as the probe is easily damaged. I used calibration fluid and continue to pour a little in the cap after every using, (after rinsing with distilled water). Just my 2 cents ... :toke: :peace:
Ordered it and it seems to work great. Thanks
 

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If you are a soil grower the best way to know what is going on with the pH of the soil is with a good pH probe like the Accurate 8.

It is very common for soil pH to vary over time which affects the plants ability to absorb needed nutrients. Plant problems caused incorrect soil pH are probably the most common issue for new growers so monitoring soil pH regularly will help keep your grow on the right track.

If you don't have a good soil pH probe (the cheap ones sold in garden stores are a waste of money) here is the next best method to check your soil pH originally posted by Waira


The Pour Thru Method for Testing Container Media

1. water containers to saturation (so that a few drops of water come out of the bottom of the container) with the normal irrigation water they have been receiving

2. after container has drained for one hour, place a saucer under the container

3. pour enough distilled (DI) water on the surface of the container to get 50 mL (1.5 fluid ounces) of leachate to come out of the bottom of the container (Table 1)

4. collect leachate for pH and EC testing

5. calibrate pH and EC meters

6. measure pH and EC of samples

note: don't worry if you don't have an EC meter

>>> If your runoff pH is higher than your starting (water) pH, use this equation to determine your soil pH:*
Soil pH = Runoff pH + Difference

If your runoff pH is lower than your starting pH, us this equation:
Soil pH = Runoff pH - Difference.

For example, say your the starting pH of your solution before it goes in is 6.5 and the pH of your runoff is 7.0. The difference is +0.5, so using the above equation:
Soil pH = 7.0 + 0.5*
Soil pH = 7.5

If your starting pH is 6.5 and your runoff is 6.0, your difference is -0.5 and using the above equation:
Soil pH = 6.0 - 0.5
Soil pH = 5.5
Very Helpful. Thanks :thanks:
 

Gonnagrowmore

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If you are a soil grower the best way to know what is going on with the pH of the soil is with a good pH probe like the Accurate 8.

It is very common for soil pH to vary over time which affects the plants ability to absorb needed nutrients. Plant problems caused incorrect soil pH are probably the most common issue for new growers so monitoring soil pH regularly will help keep your grow on the right track.

If you don't have a good soil pH probe (the cheap ones sold in garden stores are a waste of money) here is the next best method to check your soil pH.

The Pour Thru Method for Testing Container Media

1. water containers to saturation (so that a few drops of water come out of the bottom of the container) with the normal irrigation water they have been receiving

2. after container has drained for one hour, place a saucer under the container

3. pour enough distilled (DI) water on the surface of the container to get 50 mL (1.5 fluid ounces) of leachate to come out of the bottom of the container (Table 1)

4. collect leachate for pH and EC testing

5. calibrate pH and EC meters

6. measure pH and EC of samples

note: don't worry if you don't have an EC meter

>>> If your runoff pH is higher than your starting (water) pH, use this equation to determine your soil pH:*
Soil pH = Runoff pH + Difference

If your runoff pH is lower than your starting pH, us this equation:
Soil pH = Runoff pH - Difference.

For example, say your the starting pH of your solution before it goes in is 6.5 and the pH of your runoff is 7.0. The difference is +0.5, so using the above equation:
Soil pH = 7.0 + 0.5*
Soil pH = 7.5

If your starting pH is 6.5 and your runoff is 6.0, your difference is -0.5 and using the above equation:
Soil pH = 6.0 - 0.5
Soil pH = 5.5
I don’t get it :( really struggling with this
 
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