SpaceL10n's SpacePl4nts

Thank you so much for the advice! Now that you got me thinking, I am going use my tap/well water at next watering and not the RO water. Just in case.


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Day 1 after flip to 12/12

I tested the runoff from one of my plants before feeding it. I had to use my hot tub test strips for PH, because my digital meter dried out, I guess. My digital TDS meter still works. Results were:

  • PH in: 6.2-6.4
  • PH out: 6.2-6.4
  • PPM in: 29
  • PPM out: 350

A feed is definitely in order, so I fed them .25 fl oz. each of Micro/Grow/Bloom in 1 gal of my softened well tap water. Results were:

  • PH in: 6.6-6.8
  • PPM in: 600

There was no runoff to test. Plants are looking amazing though with wide, bushy, canopies and many bright green bud sites all sitting more or less level. Now just getting ready for the stretch before a little sexin’.

Picture update 3-4 days post flip. Too many leaves not getting any light but they don’t seem to care. Gonna stay the course for a couple more weeks I think…

PPM in and out was roughly the same today at 950 in and 900 out. I don’t think I ran enough runoff through the soil to get a good reading. I’ll do a slurry test next time. The PH in and out was in same range at 6.2 - 6.4.

Second dose of voodoo juice was administered today too: 2ml in 1L.

I found one male today and gave him the chop. Then I tied up the two remaining ladies to the tent posts. Wicked stretch going on and no issues to report.

PPM In: 800
PH In: 6.4

I haven’t had luck in getting an accurate PPM out. I think I need to push more water through the soil for an accurate reading. The slurry test came back at 250 ppm but I couldn’t get a lot of dirt without damaging the roots. Sooo…I think I’m just going stick to the prescribed feeding schedule and trust in the process… dunno.


Measuring the pH of soil / soilless runoff

How to test the pH of your soil mix

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 separate 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, 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. 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.

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Thanks for the info RockClarke. :+1: I think I got this time…I hope!

I started the Big Bud today. Little buds are forming. All looks well to my amateur eyes. Even the white tip problem is gone. Not much else to report.

PPM in: 900
PH in: ~6.4

PPM out: 250
PH out: ~6.4

2nd feeding of Big Bud went in today. Along with regular base nutrients. I bumped up the measurements by 15% or so as an experiment.

PPM In: 1500
PH In: ~6.6

PPM Out: 1900
Ph Out: ~6.5

The higher ppm out is concerning. Plants look perfectly healthy otherwise.

Day 18 Flowering

Nothing really interesting to report. I fixed the nutrient issue with higher pH water. My PPM in today was 2300 and PPM out was 700. Ph was around 6.8 in and 6.7 out.

I’m realizing now that I pruned the lower growth too early. I shouldn’t have touched it until week 3 apparently, but plants look fine otherwise. Any stall or shock is over with. I didn’t take much anyways…