Yellow leaves, spots - First grow - White Russian - CFL

[Dorje113]

Soil is soiless mix with 1/2 perlite as peatmoss.

Does this mean your mix is 50% perlite and 50% peat moss?

Dorje113 Reviewed by Dorje113 on 05-06-2010. Yellow leaves, spots - First grow - White Russian - CFL I did some googling prior to this, but honestly I can't nail it down. I beleive the issue started after last feeding (4 days ago). This White Russian is a clone I gotten a month prior. Its transplanted into soil 16 days ago. While it went well it took a few days for yellowing to disappear. About 3 days ago it showed up again. At first it started in middle (I think) and only effected the lower and middle leaves. One is yellow, probably canary yellow, and some dark almost red spoting on edges Rating: 5

[Rusty Trichome]

Gotta admit, that wording had me wondering too. But to me, the photo's and other info tell the story.

At best, a combo of low-end ph (yet still in range) and overwatering. At least to these old eyes.

[maslalo]

What about humidity being so low? would that effect the plant? usually its 60-70% for vegging...

[mgjscdhl]

yes, its mostly peat moss. Its not a true 1/2 mix because I put in more peat because of the consistancy of the mix. Its still probably 30-40% perlite though.

Good news I did get a humidifier and mother nature has been kind. I've kept it 40-50% most of the time. I'm still tweaking it but I can probably sustain 50% most of the time

[Dorje113]

yes, its mostly peat moss. Its not a true 1/2 mix because I put in more peat because of the consistancy of the mix. Its still probably 30-40% perlite though.

Good news I did get a humidifier and mother nature has been kind. I've kept it 40-50% most of the time. I'm still tweaking it but I can probably sustain 50% most of the time

OK, I stand by my assertion that your pH is too low. You need to add lime to balance the pH of the peat moss. Hydrated lime can be watered in, but don't try to change it too fast, and you NEED a soil test kit to know how much to change it and how much it's changed.

I use a similar mix, but it's 50% potting soil like fox farm ocean forest. This adds nutrients and raises pH.

Humidity doesn't make much of a difference. I live in CO, where there is NO humidity a lot of the time, and it hasn't caused any problems. They seem to like high altitude and low humidity :thumbsup: However, the closer you can come to ideal the better, so keep the humidifier since you already have it.

[mgjscdhl]

it was a couple points higher earlier. I guess though with folliar feeding AND ph it might be hard to know why leaves were changing yellow.

Ok. So the lime could be added to several waterings? What kind of dosing, etc.. would you suggest? That could work and alot easier than I thought.. Let me know.

I'm half asking this one, meaning I think I know what kind you mean. Is it similar to rapidtest soil kit? (couple of test strips for ph, npk values)

[Dorje113]

it was a couple points higher earlier. I guess though with folliar feeding AND ph it might be hard to know why leaves were changing yellow.

Ok. So the lime could be added to several waterings? What kind of dosing, etc.. would you suggest? That could work and alot easier than I thought.. Let me know.

I'm half asking this one, meaning I think I know what kind you mean. Is it similar to rapidtest soil kit? (couple of test strips for ph, npk values)

Any Home Depot or garden center should have soil test kits. The best one (forget the brand) uses liquid drops, I have one branded "Security" that comes with tablets, and is pretty good. Rapidtest comes with those capsules you have to dump the powder out of, which is a PITA and prolly not as good as the other 2 I mentioned.

As far as adjusting pH, maybe it's better to just use some pH UP and measure the pH of the water you're adding. It's hard to say how much to try and change pH, you can do it too quickly and cause more problems. IF your pH is too low, I'd water with pH around neutral (7) or slightly higher.

[mgjscdhl]

would you mind if I start with a stupid question? what is pita?
I do recall seeing a soil kit. I think it was at canadian tire, but it was the rapidtest kit. I saw the kit you mean on ebay. I've yet to look at a garden center we have in town.

I'm guessing these kits are a bit more reliable method than runoff. So maybee I should wait to see what it actually shows up as. She has stabilized, though not yet on full fertilizer. It would be interesting to see what those kits show for npk and ph. Seems a reasonable investment for a newcommer so I'll try finding one

[Hijynx]

PITA
Pain In The Ass

[mgjscdhl]

ahh ok lol