Rapidly developing leaf problem, 1st time grower

[etph78]

Hi,
The attached pictures show a problem that developed over a 4-5 hour period, seemingly out of the blue. This is my first grow. The two plants are AK48. Planted 9/19, switch lights to 12&12 on 10/25. The lights are an 8-bulb 2ft long T5 (yeah, not the most powerful thing, but just dipping my toe in the water here). Plants are in 3 gallon smart pots, in an 80/20 coco/perlite mix.

I'm handwatering using tap water and GH FloraMicro/Gro/Bloom and CaliMagic. The last watering was two days ago and was .5 teaspoon of each of these in one gallon of water. Each plant got nearly a gallon with a decent amount of runoff. I'm ph'ing with drops, so hard to say precisely what the ph is, but it was somewhere between 6-6.25, I would say. It was yellow, with no hint of orange or green. Daytime temps 75-80, nighttime gets down to 68. Humidity has been 60-70%.

Everything was fine after the watering until today, when this developed rapidly between the morning and afternoon, with no apparent catalyst. Again this is second day after watering.

Does this look like calcium deficiency? For what it's worth, this seems to be affecting leaves getting light more than others.

There are two phenos. The pics are of the skinnier leaf one that is harder hit. The other one has much broader leaves, and only has a little bit of this going on.

Please let me know if there is any info I haven't provided that will help.

And please help if you can. Everything seemed to be going fine, and now of course I have a problem in flowering. Agh!

 

[Vanilla Phoenix]

Might be nute burn. I'm not familiar with the nutes you are using so can't really say. Your temps look good. If the only thing you changed was the nutes and water...probably is the culprit. Hopefully someone familiar with your fert line chimes in soon.

And welcome to the Mag!

 

[king oscar]

You planted on the 19th. looks like an odd nute burn but I don't see what else could have happened in 5 hours.

 

[maimunji]

Flush with only micro bloom 6/9. Per gallon. And use this for the end.

 

[atk7]

Looks like possible over water be sure to let the pots dry out before u water again

 

[Scrappy-doo]

They don't look too bad really, but your ph is a little high. Bring it down to 5.8-5.9. You should seriously consider investing in a ph meter, it will be a much smoother ride. Coco is finicky, you want to be exact.

You also look right at the limit with your nute dose. If it were me I'd dial it back 25%. Less is always better with nutes in coco. Since they are fed regularly they don't need as much and you reduce the chances of salt buildup/lockout later on in the grow.

 

[RubeGoldberg]

Feed daily. Coco has a high cation ion exchange capacity and is gonna rob the nutrients of quite a few elements.

Start feeding daily with about 10-15% runoff, also follow the guy above's advice where he recommends a digital meter...

 

[etph78]

Hi thank you to everyone who has responded. I don't mean to be ungrateful or argumentative at all, but I'm having trouble making sense of the advice overall, because at the same time, I'm being advised to:

-Dial back nutes 25%, but also try 6/9 ml/gal of Micro/Bloom, which seems like an increase in nutes

-To feed daily, but also that my problem looks like it could be the result of overwatering and to make sure I let it dry out more

So I'm not sure which advice to take, and which not to. Or maybe there's some way that these aren't contradictory and I'm just not seeing it.

Sorry if I'm being difficult, but if anyone feels confident enough to chime in and clear up the situation, that would be great. If not, I will read into the 6/9 recipe, and I'll wait for it to dry out a bit in the meantime.

I was concerned when I put these in 3 gallon pots that that was too big for the plants, and the coco ended up being finer than I expected and seems to hold much more water than I thought it would. So I sort of wonder if I'm not dealing with a little over-watering and/or lockout caused by nute build up. Although I've never had any droopy leaves after watering, so I figured I was ok as far as over-watering. Pretty confused at this point, honestly.

 

[damoney]

Peyote purple

Peyote purple

i have problem with leafs for my 3rd time growing i ph at right levels 6.9-6.2 i ec ppm level at say around 300ppm and i still get spots and burn holes but the only thing i reckon it is that i use a humidifier and kind led so im guessing maybe the led is burning the water on the leaves causing discoulor to my leafs and holes or a lack or magnesium maganese or sulfer or ph my humidifir nutrients i use is Nectar of the gods full line any suggestions anyone??

 

[etph78]

Ok, I'm going to take a stab at my problem. I don't think it's a deficiency, because it's happening more on the pheno with the skinny leaves than the plant with the very broad leaves. It seems that a deficiency would hit the plant with the most leaf area the hardest.

I don't think it's over-watering because I've never had even a temporary drooping of the leaves after watering.

I think it's nute burn. I think I transplanted smallish plants into 3 gallon pots that were too big for them. And that when I watered, a bunch of nutes and water ended up in parts of the pots without roots in them. That I watered with runoff, but not with enough runoff, and not evenly enough all over the pot. And that now there is a bit of nute build up in the pot, or parts of it, and now that the roots are really filling the pot up more, they're getting to those parts of the pot and finding too many nutes.

I think that is...a solid theory.

I'm going to water tomorrow morning, and I'm going to really flush it with a weak nute solution. I'll look into the 6/9 recipe. And maybe I'll do that ratio but a little on the weak side.

If anyone wants to chime in on whether this theory sounds plausible, great. I'll check back in later to let you know if it seems to have cleared up either way.

 

[etph78]

As for Damoney, I'm a newbie, and I'm having trouble, too. So make of my advice what you will, but I think those plants look over-watered. But either way, I suspect you'll get better/more advice if you post your own thread.

 

[damoney]

peyote purple

peyote purple

i figured the problem it may have been over water but dont think so i think it may have been cal mag calcium deficiency im using nftgods so i flush with hharvest now plants looking good as every spots and deficiency have now gone and stopped foiler feed when lights on what may have been causing nutrients burn holes on my plant due to using l.e.d

 

[etph78]

And just to check back in on my issue...I think it was definitely just nute burn. Unfortunately, I lost enough leaves on the one skinnier-leafed pheno that I'm going to get a pretty small yield from it. But the other plant is still doing really well.

Since my original post and the responses, I've switched to the 6:9 formula using GH micro and bloom. With my lights and the size of my plants, I've found .5 tsp micro and .75 tsp bloom in a gallon of water seems to be about right, which is the same ratio, but more like 2.5:3.75. I'm using a little less micro on the skinny pheno, and using a bit of molasses now on both plants.

But heading into a second grow soon, I think I'll stick with this nute formula, just start really weak and work my way up to .5/.75 tsp per gallon.

 

[gizmo666]

going by your pictures i would say a boron deficiency
i use this guide http://www.growweedeasy.com/marijuana-symptoms-pictures
hope you get it sorted out

 

[stoned40yrs]

I'm late to the party I guess. What brand of coco did you use and if it wasn't a great brand of coco did you charge it? Your main problem was going up to 3 gallon pots and not nursing root growth to fill in the container. Did you have roots popping out of the fabric before you flipped to 12/12? This is a must before you can start feeding daily and get explosive growth. Next problem was feeding them calmag unless you use RO. That shit is poison and will cause lockouts like you have. Using the lights you are don't try feeding them 6/9. Maybe 4/6 is as strong as you can go with floros. Answer my questions and I'll tell you how to do it with no probems next grow. You probably don't have a fully developed root system in this grow, not much you can do at this point except ride it out.