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How can I measure the pH of soil/soilless runoff?

Smokin Moose

Fallen Cannabis Warrior
How to test the pH of your soil mix

Measuring the pH of soil is just as important as with hydro applications, but few people know how to test soil pH to see if it is within the optimum range for growing robust healthy plants. Here I will try to explain my method of testing any soil / soilless mix, enabling me to spot any problems and correct them if necessary.

Firstly, wait till your soil has dried out and is due for its next watering schedule. Then take some plain water that you usually water your garden with, and adjust the pH to 7.0. You must make sure that you know the exact pH of the water going into your soil, and the neutral 7.0 is best, but anywhere from 6.5 — 7.0 will suffice.

Then place your pot into a bowl of some sort to catch the runoff water, and then start to water your soil slowly (with your pH- corrected plain water) till the water starts to drip from the bottom.
It's the first drops of water that will give you the best reading of your soil, so make sure to water slowly till you see the first droplets. Then remove the pot from the bowl to eliminate excess water entering the bowl. Then perform the pH test on the runoff and compare it too your initial test.
The results of the runoff test will likely be lower than your starting value of 7.0. If this is the case, a small drop of 0.5 pH to 6.5 pH (example) would be ok and your soil needs no further alterations at the moment. But that's not to say that it won't need any future tests at all, just not at this time.

[Editor's note: It may be beneficial to obtain an initial sample, as well as a 'full flush' sample in seperate bowls. In addition, test several plants in the garden just to verify your results]

What if the pH is off?
If your results prove to have dropped considerably, say to around 5.5 (which can happen in late stages of flowering), you will need to add some lime into your soil to help buffer the pH back up again.

Remove the first inch or so of soil, taking care not to damage any roots whilst performing this task. Then sprinkle the lime into the pot, nice and evenly at a rate of 1 teaspoon (5 ml) of lime per gallon of soil. Then replace the soil you removed earlier, and saturate the soil good to wash in the lime.

Do the same test next time your plants need watering just to check that everything is fine, if more lime needs to be added then just repeat the process again till you reach close to 6.5 — 7.0 with the runoff.

Ensuring that your pH is correct should be done throughout the life cycle; this will help eliminate any nutrient lockout that may occur. I recommend doing this once a month just to keep the PH in check, and you should never have a problem with deficiencies caused by pH lockout.
 

Nunya Biz

New Member
Thanks for the post. You seem to ACTUALLY know what you're talking about. I'm a rooky grower and I was wondering if you have any good tips? I just got me perscription but have no clue what I'm doing and need some help.
 

paul1791

New Member
seems my ph promix is extremely low...my plants are a couple weeks away from harvest. I also have a mother plant that looks bad. I had two die a week ago. Shall I flush with distilled water? I was given a bottle of potassium silicate(i think,the label is all shredded) Will that work or must i get lime ?
 

Nunya Biz

New Member
Flush it, then measure the PH. If it still needs fixed I would go get the lime because you never know what you got with a shredded label...
 

paul1791

New Member
i meant to say millions of people out there and when you need advice ...where is it? i really needed and now my plants are dead...my fault but man I gotta find another site for growing help
 

EL MAGNIFICO

New Member
I am on my 2nd grow. I use rockwool. But I too wonder about your problem. so, since I use rockwool, I only have to watch the ph of the nutrients, and water in which it is contained. Can't you just use some ph up solution in your nutrient bottle, and in effect, change the ph of the soil?

we can learn together. I will ask my local grow shop.
 

paul1791

New Member
thank you for the reply....I think I shall look for another site that is a bit more active but hey I appreciate all the help I did get from the people who took the time to answer my posts....i don't know if my plant is dead or soon to be...the times I have flushed the shit of my plants they never recovered...too much lime? water? who knows?
 

EL MAGNIFICO

New Member
good luck bro- lime is a very potent substance. I would stay away from it all together. I'm tellin you... use rockwool and some earth juice brand fert. keep it simple good luck though
 

tgadfgadgf

New Member
Paul1791 you are in the wrong thread if you want help. This thread is clearly a how to section. You have to go to the help section where you would get your questions answered. This is a very good site. Sorry that you got discouraged.
 
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