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Old 07-06-2013, 02:14 AM #1
sativo
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pH 5.2 vs 6.2?

Hello

I have a question that I was hoping one of you more experienced growers might be able to answer for me. The question is: Is it possible to get better yields setting pH to 5.2 as opposed to 6.2? It appears that the plants could benefit from the extra phosphorus that is to be had here, as opposed to 6.2 where phosphorus appears to be a bit locked out of the picture. Thanks in advance everyone

Nevermind, everybody, I got it, thank you.
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Old 07-07-2013, 01:21 AM #2
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Actually i think 5.2 is a bit low and would reccomend at least a ph of 5.5.
And one of the great benefits of coco is that you can let the ph swing between 5.5 and 6.2 and if you look at the plants carefully you will recognize which ph they like the most.
A ph of 5.8-5.9 works for me pretty nice, but it depends on the conditions and the genetics i guess.
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Old 07-07-2013, 02:02 AM #3
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I rock 5.8 for coco

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Old 07-07-2013, 08:42 PM #4
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a ph of 5.2 will cause the leaves to start curving.
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Old 07-08-2013, 04:10 AM #5
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I think it depends if your drain to waste or recirculating res...in any case 5.2 will cause problems ime. Dtw I alternate 5.5 and 5.8 looosely. 5.5 for cal and 5.8 to access mag. Recerculating I would let the ph swing from 5.5 to 6.0 and reset at 5.5 with every fresh res...
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Old 07-08-2013, 06:35 AM #6
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Wow, so much I did not know. So, 5.8? Really? I thought this was not a good range, specifically because of the low magnesium levels.
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Old 07-08-2013, 06:22 PM #7
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Your welcome
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Old 12-22-2016, 07:18 AM #8
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so according to the very last graph, there's a cal/mag spike right at 5.2, as well as everything else, only thing a little low is manganese

I've been running 5.2 with canna ab, and RO water on a test clone, which comes out at 5.2 without PHing it upon making up the mix. The little plant is doing great, not a single sign of any cal/mag issues
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Old 12-22-2016, 02:01 PM #9
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I just came out of a situation where I was accidentally feeding at 5.2 for a month or so. I was doing improvements to the room, trying to keep the veg room going and my pH pen died and I didn't believe what the drops were telling me. . Plants did not like! They're coming back after a few weeks at 5.8-6.1 but growth was seriously stunted and there was lots of leaf necrosis. No way they could go any further at 5.2. I'll always keep a backup pH pen on the shelf going forward.
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Old 12-22-2016, 06:03 PM #10
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'Proper' pH depends on the type of system your plants are in.

Roots-out systems, where the roots dry out between waterings, have a natural pH drop during the dry out period. 'Proper' pH range will vary with each system but top and bottom pH (edit: of your nutrient solution) will generally be 5.5 to 6.1.

Roots-In systems, where the roots are constantly exposed to the nutrient system, do not have a 'dry out' induced pH swing. Best results are obtained by setting the pH at 5.4 and letting the pH naturally rise as the plants eat nutrients. Res size determines how fast this swing occurs. 5.4 - 5.8 is where you're going to find the best results with these systems.

Just figured I'd clarify.

Last edited by Douglas.Curtis; 01-01-2017 at 09:53 PM.. Reason: Nutrient and root zone pH differ
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