Need a couple diagnosis’

[DTOM420]

I need some help diagnosing 2 problems. The first is two 17 day old CBD auto strain seedlings. They’re in 5 gallon grow bags in a soil mixture but germinated in a 16oz cup size patch of 50/50 promix and perlite. They started out looking great but have yellowed considerably in the last few days. They’re under a 600w (at the wall) 3000kLED fixture that’s 3.5’ above them eand they’re slightly shaded by some bigger plants in flower. They have been getting distilled water since I put them in cups to pop. Temps range from 78°f-72° w/ RH of 55%-60%. The soil tests in at a pH of 6.8. I’ve been feeding them with distilled water until now but I decided today to start giving them some light nutes because of the yellowing. So, I pH’d our well water to 6.5 and gave them some 1/4 strength of a local organic liquid nite that’s 6-12-6 and has a soil activator. I’m surprised that there’s any deficiency going on but I’m concerned about the yellowing. My first suspect is nitrogen but I can’t imagine and next would be phosphorous but I added 5 tablespoons of seabird guano to the mix so there ought to be plenty of phosphorous. I’m at a loss. Sure could use some advice here.

This next plant has been a struggle. It’s a 75 day old Blue Widow in 7 gallons of soil. I revenged her after sexing her and she’s gotten out-of-hand dense without the stretch I would have liked. The issue, as you can see is interveinal yellowing that starts on the leaf edges includes new AND older growth. After this first arose, about a month ago, I discovered that the pH had dropped through the floor (I never could figure out exactly why) down to around 4.2! So, I attributed the yellowing at that low pH to a Magnesium deficiency due to pH lockout. I sprayed her with water and epsom salt, flushed her with Sledgehammer and un-pH’d well water that was around 7.7 and continued to water with that high pH water She slowly started to respond and greened up some (but never really completely); but now the same issue has returned and I can’t really blame pH, I don’t think. The soil tested at 6.5 a couple of days ago (following 2.5 weeks of watering with slightly alkaline water) and the last few waterings have been pH’d to 6.6

Excuse the water droplets on the leaves in the pics. I busted her heavily with epsom salt water and THEN thought to take a picture. Lol! FWIW, the 3000k bulb makes the leaves look even more yellow in these pictures than they look in reality

Maybe @Rollin_along @Waira @Green Goblin @archie gemmill @912GreenSkell @KREATURE or someone else can help me out.

 

[MickJ]

My guess is top one is underfed or over watered. Bottom one I think is potassium deficiency. @Waira is the guy in the know though.

Sent from my comfy chair. [emoji3][emoji41][emoji848][emoji12]

 

[cecchini3]

The first little ones seem to be short of nitrogen. Raise nitrogen level, and check ph of water.


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[hecno]

@DTOM420 Mate , you have a number of problems there . The main thing is it all out of wack . Big W will know more . -- and what did I sat to ya -- don't be in a hurry .

 

[DTOM420]

@DTOM420 Mate , you have a number of problems there . The main thing is it all out of wack . Big W will know more . -- and what did I sat to ya -- don't be in a hurry .

Lol, these aren’t in any of that compost or forest soil. This is the same stuff I’ve been growing in. The older plant is one I posted about in here before and Waira suggested getting a pH probe, which I did, and that’s how I found the super low pH in that pot. Weird thing is....another pot with exact same soil and a diffferent strain.....zero issues! I had NO nutrient issues with my outdoor garden with the same or similar soil but indoors I’m having some issues. I’m not hurrying, brother. Unless I’m missing something?

The over watering suggestion by @Rollin_along could be spot on because I’ve watered more than I usually do, trying to keep the soil from completely drying out. I read that the microbes don’t like a dry out even though the plant might. I guess I’m gonna quit that and let it dry, to see if things improve. I’ve never had a real issue with seedlings.

 

[bad dragon bzzz]

hmm im so bad at the defs/toxs game,but i may aswell make an arse of myself before Waira comes along and enlightems us.like the time i guessed lithium in a quiz
small plant in a big pot overwatering is all to easy.distilled/RO water always scares me,can ya mix it with some tap ? could be def in a lot of the smaller things.
pot ph of 4.2 something whacky.
stick a probe in a wet/dry pot dif readings,dont they need a moist pot for a proper reading ?
good luck n keep er lit.

 

[DTOM420]

hmm im so bad at the defs/toxs game,but i may aswell make an arse of myself before Waira comes along and enlightems us.like the time i guessed lithium in a quiz
small plant in a big pot overwatering is all to easy.distilled/RO water always scares me,can ya mix it with some tap ? could be def in a lot of the smaller things.
pot ph of 4.2 something whacky.
stick a probe in a wet/dry pot dif readings,dont they need a moist pot for a proper reading ?
good luck n keep er lit.

Yeah, I’ve been wondering about probing for pH - whether to do wet or dry soil? I asked Waira a while back, since I got the Accurate 8 at his suggestion; but I never heard back. I got a very acidic reading on some OF when I first got the probe; and I called FoxFarm to complain. They told me I needed to use the probe on drier soil. So, since then, I have only used it before watering.

That bag of OF was very acidic either way! Lol!

 

[Waira]

---- first plant looks underfed, but not P,... yellwoing like that, at tops is usually a secondary or micronute, and the soil pH is borderline too high ... Fe and Zn start to lock out around there,.. also, could be simple lack of too, that soil mix may be lacking in micronutes, and no complete feeds means incomplete balance of nutes,... Dial your inputs down in pH to low 6's, and get feds and better yet, a micronute supplement going,.. Earth Juice Microblast is my fav'...

Haaa, said it's just fine, what a bunch of fucking liars- ... As I said , soggy moist soil and near needing water moisture levels don't give the best readings..... and don't take readings if you just fed,... If I miss something, holler DTom, I'm fucking swamped sometimes and things can get missed,....
Each pot is it's own little world man, what one does has zero connection to what another does even if everything else is the same,... many factors in play that change things!

Second plant pretty much ditto, that's Zn defc.,....if the pH is back in range, it's a lack-of deal, plus the roots took a beating after all that snafu reveg' and pH dump,....root tonics help!

 

[DTOM420]

---- first plant looks underfed, but not P,... yellwoing like that, at tops is usually a secondary or micronute, and the soil pH is borderline too high ... Fe and Zn start to lock out around there,.. also, could be simple lack of too, that soil mix may be lacking in micronutes, and no complete feeds means incomplete balance of nutes,... Dial your inputs down in pH to low 6's, and get feds and better yet, a micronute supplement going,.. Earth Juice Microblast is my fav'...

Haaa, said it's just fine, what a bunch of fucking liars- ... As I said , soggy moist soil and near needing water moisture levels don't give the best readings..... and don't take readings if you just fed,... If I miss something, holler DTom, I'm fucking swamped sometimes and things can get missed,....

Each pot is it's own little world man, what one does has zero connection to what another does even if everything else is the same,... many factors in play that change things!

Second plant pretty much ditto, that's Zn defc.,....if the pH is back in range, it's a lack-of deal, plus the roots took a beating after all that snafu reveg' and pH dump,....root tonics help!

View attachment 969556

Thanks @Waira !! I thought 6.5pH was optimal for soil. So, thanks for the correction.

I ordered some microblast for the older plant. Check it out, though.... I misted it with epsom salt in water and removed a ton of leaves to thin her out some. I also LST’d the main side branches and sorts supercropped some of the upper side branches off those (15) main branches. I did all that before you posted. I also fed with a 6-12-6 organic feed with a soil activator and I’ve been adding Recharge once a week for a while. IShe’s already improving. There’s considerable new growth and the new growth doesn’t seem to be as yellow. Seems like things are greening up a good bit. I’m certainly going to dose it with the microblast but I’m wondering if this problem could be related (in any way) to the light or the density of the leaves? Or, is it more likely the epsom salt or the 6-12-6 nutes that helped the issue? I had this happen before- I fed similarly and it seemed to improve and then came roaring back a week or so later. It’s frustrating me! Lol!

I should also say, that this plant’s roots are really filled out in that 7 gallon bag! I mean, when I push that pH probe in, I can feel the roots popping all the way to the bottom. I gave her lots of root stimulators and Micorrhizae early on and have given her a regular course of them her whole life. She drinks up 2 gallons of water every 3 days, or so.

I also dimmed the light considerably to see if she (and her sister who was also reveged) will stretch out a bit.

I didn’t want to bug you about the pH probe. I figured you had to be real busy when I didn’t get an answer to my pm. No worries, brother! I just figured I’d leave you be and ask you the next time I posted a thread here. Now I’ve got my answer. I’m going to go re-check the ph tonight or in the morning since I’m between waterings now. I’ll post the results in here IF they’re any different.

 

[DTOM420]

Here she is, as of this morning: