• Here is a link to the full explanation: https://rollitup.org/t/welcome-back-did-you-try-turning-it-off-and-on-again.1104810/

Seedling Diagnosis

O

od1

New Member
Hi all,

I'm trying to diagnose 2 of my seedlings. One of the ones in question has brown spots, and both of them have the first set of leaves curling in. The other 2 look ok. I didn't realize I should have waited on nutes till the cotyledons are dried up, so I've backed off that for the moment. I've been watering about every 3 days or so. The last time I watered, it was with distilled water with 1/4 the recommended dose of Calimagic added.

I'm thinking the brown spots may be nutrient burn. In another thread, some people also suggested transplant shock was happening. How can you tell if a seedling is in shock?

What's the recommended regimen for Cal-Mag? And how can you tell if there's too much or too little? I understand you're supposed to use it every time in coco. I did "precharge" my coco with the recommended dose on the label of Calimagic per gallon.

I got some Azomite, which I read can help plants, but it's too late to mix it into the coco, and I read it was useless as a top dressing.

Let me know what you think, and if I should just wait it out and see what happens, or do something.

Thanks


All 4 seedlings:

20150214_123804.jpg


From above of the 2 with drooping leaves:

20150214_123826.jpg


Shots of the brown spots on the seedling that has them:

20150214_124118.jpg

20150214_123917.jpg
 
warble

warble

Well-Known Member
Do you have proper drainage? What ph? How hot are those lights? No perlite? How quick does it dry? What is RH?
 
markymark88

markymark88

Well-Known Member
I can't see brown spots but being that small and feeding them it's prob nute burn. It also looks like they are being burned by that led. I keep mine 24" above vegging plants and I'd still consider them seedlings so even higher
 
O

od1

New Member
I'm now thinking it may have been too much potassium, since the leaves that are coming in look better. I was reading this page: http://www.growweedeasy.com/calcium-deficiency-cannabis and realized it looked like a calcium deficiency, but they say too much potassium can also look like a calcium deficiency. I did add some nutes and Supercharge Root Tonic for 1 watering.

I poked 4 holes in each cup with a screwdriver, and the drainage seems fine. I only have the drops for measuring pH, but it looks around 6.The lights are LEDs, which is why the photos look weird, so heat shouldn't be a concern. They're also 3 feet away from the plant tops. The tent temp is around 75-76 F, and the humidity is around 50% now. I'm not using perlite, although when I transplant into the drip system buckets, I'll use a hydroton top and bottom layer. The duration between the last time 2 times I watered was about 3.5 days, I believe. The last time I watered was Thursday at about 1 AM. I'm thinking I may want to water tonight, or tomorrow morning based on the check I did earlier.

Mark, I have a P600 light from Platinum LED. Do you think I should move it farther than the 3 feet away it's at now? 3 feet was the recommendation from the manufacturer. If you maximize the photos, you should be able to see the brown spots. Thanks

Edit: I looked at this page: http://www.growweedeasy.com/cannabis-light-burn and I don't know if I have light burn, but I do wonder if I should have stuck with the fluorescent longer. At what point should I switch from a fluorescent to an LED?
 
Last edited:
a senile fungus

a senile fungus

Well-Known Member
I'd say those two droopy ones are over watered. Do those two cups weigh more than the other two cups? I over watered mine 2 days ago and it just perked up in the last couple hours. If those two cups feel heavier in your hand then ease off on water till cups lighten or plants perk up.

I'm usually not one to diagnose problems but I've got ten seedlings right now at the same age, and your two look over watered to me.

HTH
 
markymark88

markymark88

Well-Known Member
od1 said:
I'm now thinking it may have been too much potassium, since the leaves that are coming in look better. I was reading this page: http://www.growweedeasy.com/calcium-deficiency-cannabis and realized it looked like a calcium deficiency, but they say too much potassium can also look like a calcium deficiency. I did add some nutes and Supercharge Root Tonic for 1 watering.

I poked 4 holes in each cup with a screwdriver, and the drainage seems fine. I only have the drops for measuring pH, but it looks around 6.The lights are LEDs, which is why the photos look weird, so heat shouldn't be a concern. They're also 3 feet away from the plant tops. The tent temp is around 75-76 F, and the humidity is around 50% now. I'm not using perlite, although when I transplant into the drip system buckets, I'll use a hydroton top and bottom layer. The duration between the last time 2 times I watered was about 3.5 days, I believe. The last time I watered was Thursday at about 1 AM. I'm thinking I may want to water tonight, or tomorrow morning based on the check I did earlier.

Mark, I have a P600 light from Platinum LED. Do you think I should move it farther than the 3 feet away it's at now? 3 feet was the recommendation from the manufacturer. If you maximize the photos, you should be able to see the brown spots. Thanks

Edit: I looked at this page: http://www.growweedeasy.com/cannabis-light-burn and I don't know if I have light burn, but I do wonder if I should have stuck with the fluorescent longer. At what point should I switch from a fluorescent to an LED?
Click to expand...
No 3 feet sounds about right and sounds like temps humidity are in check also. I usually flip from my t5 when the first set of 3 leaves are grown and developing it's first set of true 5 leaves
 
O

od1

New Member
A Senile Fungus, the light is off, so I'll have to check later, but I think I remember them being about the same when I weighed the cups. I also grabbed a cup with just coco to compare, and the seedling cups were a bit heavier, so I thought it was watering time.

I understand that with coco it's harder to over water, but that also you're not supposed to let the coco get too dry. How do I find the right balance between letting the cups dry to promote root growth, and not letting the coco dry out too much?

Also, if you check water levels with your finger to the first knuckle, should the coco be bone dry, or slightly moist when you water?

Mark, thanks for the tip on that.
 
Cpappa27

Cpappa27

Well-Known Member
The ones that are drooping have light nutrient burn. Just water for another week or so. Bring that led down to about 32 inches above the plants and bring it down slowly as they grow and dont go lower than 20 inches. The leaves that are a little screwed up wont heal so dont panic. Your plants will survive as long as you leave them alone.
 
O

od1

New Member
Thanks man, so you don't think I need to worry about overwatering? And I at least need to add the Calimagic, since I'm using distilled and RO water. The TDS meter reading was 90 PPM. Is that about right for seedlings, or should it be higher?

Here's what the manufacturer said about the light distances, "For young transplants and early veg, 36” from canopy with veg only switch. Mature veg, 24” from canopy veg only. Flower, both switched 18”-24” from canopy."

These LEDs are supposed to be really good. You still think I should bring them down to 28 inches?
 
Cpappa27

Cpappa27

Well-Known Member
od1 said:
Thanks man, so you don't think I need to worry about overwatering? And I at least need to add the Calimagic, since I'm using distilled and RO water. The TDS meter reading was 90 PPM. Is that about right for seedlings, or should it be higher?

Here's what the manufacturer said about the light distances, "For young transplants and early veg, 36” from canopy with veg only switch. Mature veg, 24” from canopy veg only. Flower, both switched 18”-24” from canopy."

These LEDs are supposed to be really good. You still think I should bring them down to 28 inches?
Click to expand...
You can leave it where it is and follow the manufacturers recommended height. I had no adverse affects from how I told you to do it. As far as the calmag, its not needed yet. Use spring water don't waste your money on that distilled shit. Spring water or good tap water has many micros in their natural state with the natural cofactors needed for the plant to absorb and utilize them properly.
 
warble

warble

Well-Known Member
There is no nute burn on your tips. At least you cannot tell from your pictures. You will need calmag. You need more than four screwdriver holes in your solo cups. Try eight or ten. Don't water when your cups feel heavier than an equal amount of coco. Your cup should feel like a cup filled w/ coco. When my girls are that small, I just spray ph 5.8 water on them, just like how I treat my clones. Sometimes I'll throw some ewc tea in there, not more than 300ppm, just to keep the roots moist. Your lights don't seem to be bleaching your leaves, so you could try to get them a little closer, but they should grow up to the point they will get LED bleaching. Then you might want to back the lights off. That won't be for a few more weeks.
 
O

old shol4evr

Well-Known Member
a senile fungus said:
I'd say those two droopy ones are over watered. Do those two cups weigh more than the other two cups? I over watered mine 2 days ago and it just perked up in the last couple hours. If those two cups feel heavier in your hand then ease off on water till cups lighten or plants perk up.

I'm usually not one to diagnose problems but I've got ten seedlings right now at the same age, and your two look over watered to me.

HTH
Click to expand...
i agree with what he said
 
*BUDS

*BUDS

Well-Known Member
Transplant shock and now your over watering the sick plants. Reduce watering, only water when pots become light in weight.
 
O

od1

New Member
Thanks, I did a Google Image search, and it does look like transplant shock, although it's somewhat hard to find good images of shock.

Any tips on preventing shock in the future?
 
*BUDS

*BUDS

Well-Known Member
Yes always make sure the plant is rootbound. Saturate the rootball and soil let it stand for 5 min then carefully sqeeze the sides of the pot the carefully pop out the rootball upside down into your other hand. Then put it a corner of the room that doesn't have direct light for a week or so.
 
O

od1

New Member
I germinated in Rapid Rooters in the tray they came in, so the roots were hanging down when I lifted the top tray up, and somebody said it was time to transplant, so I did. How about for a situation like that?

Next time I'm going to wait longer before switching to LEDs.
 
You must log in or register to reply here.
Top