What causes this curling/canoeing downwards?

[Tico Brohei]

Hey guys. I have 4 plants in my grow tent right now, all of them are sour diesel grown in the same soil. One of the 4 plants has started doing a strange curling down and in on itself and its only affecting the new growth at the top. It's accompanied by a slight yellowing of the leaves as well. All of the the lower leaves seem to be normal and healthy for the most part but this plants growth has slowed significantly compared to the others. The other 3 plants seem to be doing quite well, and considering they are all subject to the same conditions and are the same strain I am stumped. Does anyone have any idea what could be causing this?
(sorry the lighting in the grow tent makes the color difficult to make out)

 

[Tico Brohei]

A little more info...
I am growing in Fox Farms Happy Frog soil.
Water is adjusted to 6.5 ph using lemon juice
The temperature is usually pretty consistent between 75-80F during the day, 65-70F at night
Humidity is around 50-55% (higher during seedling stage)
Exhaust fan and oscillating fan going at all times
LED grow light currently on 18/6 cycle
The plants are 4 weeks since transferring the germinated seeds to soil, they spent 3 weeks in solo cups until transplanting to 5 gallon fabric pots.
Up until 3 days ago the plants have had no nutrients other than what is available in the soil. (Sprinkled some mycorrhizae on roots before transplanting)
I fertilized with Sensi Grow by Advanced nutrients and only mixed half of the recommended dose, this problem started a few days before using the fertilizer.
Started low stress training a few days ago.

 

[Madbud]

Could be overwatered. Do they all feel about the same weight?

 

[Tico Brohei]

Ya I just checked and they all feel pretty much the same. I water them all at the same time with the same amount of water for each plant. I usually water based on how the soil feels and that determines when I water again. I think I had a minor issue with over watering earlier in their lives which has since been corrected and am now using soil moisture meters. This problem only seems to be affecting the newer growth at the top. I do wish I would have added some more perlite to the soil before transplanting because it does seem to retain its moisture for a long time...

 

[Seraphine]

My plants have only done this when their roots weren’t happy.

Could be too much water. Could be the lemon juice.

 

[Tico Brohei]

Thanks for the replies. I think you guys are right about the water. The more I think about it the more it makes sense. The soil seems to retain a lot and I'm watering twice a week at most. Really should have added more perlite to the soil. The other plants seem to be soaking it up a bit better but the one plant is struggling. As far as the lemon juice goes I only add it until the PH is at an acceptable level, my tap water is around 7.8. The plants seem to be doing fine but maybe the runt of the litter is struggling with the water intake.

 

[OldManRiver]

Overwatered.

 

[chemistry]

Why did you plant to the side of your pots? One side of your plants roots have no were to forage. I would re-plant into the middle of the pots to create a hole root ball instead of a half.

 

[Tico Brohei]

They were planted in the middle. I just started low stress training them, bent the plants over and tied them down.

 

[chemistry]

How many PPM's in a half dose of the Sensi Grow? You said you planted into Fox Farms, this might be your problem, your soil will be hot already with the FF, so the nuits might be just pushing your plants over the edge.

 

[Tico Brohei]

I dont think it was the fertilizer. The plant started doing this a few days before i used fertilizer for the first time. I waited until the plants were 4 weeks old before adding any nutrients. Its been a few days and the soil is drying up and the plants colour is coming back.

 

[chemistry]

I dont think it was the fertilizer. The plant started doing this a few days before i used fertilizer for the first time. I waited until the plants were 4 weeks old before adding any nutrients. Its been a few days and the soil is drying up and the plants colour is coming back.

Did you test your run off before you added extra nuits? Can you put up a pick of the first plant in your first post, and in daylight or as near as you can get.

 

[Madbud]

Curious if you are getting the same ph reading on each of those meters. I find them inaccurate to the alkaline side, 6.6- 6.8 reads at 7 or higher. So 6.5 could really mean 6.2ish. Lots of maybes, like maybe the nutes didnt dilute and she got the hotshot. Good luck
Edit: have you fed the mycorhizae any sugars? Unsulfured blackstrap molasses works, teaspoon/gallon at most.

 

[Jimster]

Fox Farm stuff is pretty hot out of the bag and has been known to cause some issues with seedlings. When additional nutrients are poured on a fragile seedling, the result can be overdoses of nutrients. Flks need to keep in mind that these are small plants, not redwoods. The amount of nutrients/fertilizer tht they need is minute, Feeding all this is like feeding a newborn a large pizza. Go easy on the nutrients and I think you will see things improve. Just my opinion.

 

[Buzzer777]

Fox Farm stuff is pretty hot out of the bag and has been known to cause some issues with seedlings. When additional nutrients are poured on a fragile seedling, the result can be overdoses of nutrients. Flks need to keep in mind that these are small plants, not redwoods. The amount of nutrients/fertilizer tht they need is minute, Feeding all this is like feeding a newborn a large pizza. Go easy on the nutrients and I think you will see things improve. Just my opinion.

Also known as DA "CLAW"! ( too much Nitrogen)

 

[simcoesod]

i use lemon juce all the time...i have never noticed any drawbacks

 

[Tico Brohei]

Curious if you are getting the same ph reading on each of those meters. I find them inaccurate to the alkaline side, 6.6- 6.8 reads at 7 or higher. So 6.5 could really mean 6.2ish. Lots of maybes, like maybe the nutes didnt dilute and she got the hotshot. Good luck
Edit: have you fed the mycorhizae any sugars? Unsulfured blackstrap molasses works, teaspoon/gallon at most.

Those are just moisture meters not ph. I use a digital ph meter to test water. Will try testing run off next watering. Haven't added any sugar but have been reading up on it and will be trying it out.

 

[Seraphine]

Add a fan blowing across your soil. That has helped me when I had soil that stayed moist for too long.

 

[Tico Brohei]

Did you test your run off before you added extra nuits? Can you put up a pick of the first plant in your first post, and in daylight or as near as you can get.

I will post a pic in natural light once im off work.

 

[PlumberSoCal]

i use lemon juce all the time...i have never noticed any drawbacks

I do too, in my vodka and tonic. How are you using lemon juice?