Slow growth and spots in leaves, root rot?

Tris · Apr 15, 2022

Hello, I'm on week 3 since sprouting of my autoflower plants.
The plant on the left seems to be growing fine, I have bent the main stem at 75 degrees with a 3d printed lst clip.
The one on the right however, seems to be growing very slow, and have the roots slightly brown.
I'm growing in a sterile environment because it's impossible to get hydroguard or similar in my country.
Also the smaller one seems to be developing some sort of brown dead spots, what could it be?
Also, being autos in hydro, do they seem a too small for their age?
Thanks

2Bad · Apr 15, 2022

Whats your humidity?

Tris · Apr 15, 2022

2Bad said:
Whats your humidity?

Between 50 and 70, depending on the day.
If I see it gets too low I will increase it and if it goes to high i turn on the AC on dry mode.

Tris · Apr 15, 2022

2Bad said:
Whats your humidity?

This is today's humidity graph

2Bad · Apr 15, 2022

I'm not a hydro guy. But your VPD is off by a little. I'm sure someone will have a better response. But I'd definetly adjust your VPD.

Tris · Apr 15, 2022

I now see that the tips of the plant are getting a bit yellow, But its just 1mm of the tips, very small.
My PPM are arround 700 so i doubt its that.

2Bad · Apr 16, 2022

Tris said:
I now see that the tips of the plant are getting a bit yellow, But its just 1mm of the tips, very small.
My PPM are arround 700 so i doubt its that.

Looks like light stress

Habosabin · Apr 16, 2022

When I zoom in it looks like brown stuff in the bundles. If that brown color is snot like you have root rot.

The3luedevil666 · Apr 16, 2022

Tris said:
Hello, I'm on week 3 since sprouting of my autoflower plants.
The plant on the left seems to be growing fine, I have bent the main stem at 75 degrees with a 3d printed lst clip.
The one on the right however, seems to be growing very slow, and have the roots slightly brown.
I'm growing in a sterile environment because it's impossible to get hydroguard or similar in my country.
Also the smaller one seems to be developing some sort of brown dead spots, what could it be?
Also, being autos in hydro, do they seem a too small for their age?
Thanks
View attachment 1236115 View attachment 1236116 View attachment 1236117

How far is bottom of basket from water? Is it sitting in the water or above? Also do the roots smell?looks like root rot. H2o2 will fix root rot.what is your water temperature? Do you have a chiller?

Beowuuulf · Apr 16, 2022

PH? Is air pump shutting off at all? Based on the lack of shoots coming from the long root braid, I'd guess they don't like the water.. could be too much ppm, or not enough dissolved oxygen, high temp, infection.. if you can use some frozen water bottles and less PPM, with 5.2 to 5.8PH then they can recover I think..

Tris · Apr 16, 2022

The3luedevil666 said:
How far is bottom of basket from water? Is it sitting in the water or above? Also do the roots smell?looks like root rot. H2o2 will fix root rot.what is your water temperature? Do you have a chiller?

1 inch or more above the water, they don't smell bad, I'm adding a product for that, I think it's diluted pool shock or something similar (have received.feedback from many growers that it works)
Mi water is between 16 and 22, when it goes up I will add a frozen water bottle.

Tris · Apr 16, 2022

Beowuuulf said:
PH? Is air pump shutting off at all? Based on the lack of shoots coming from the long root braid, I'd guess they don't like the water.. could be too much ppm, or not enough dissolved oxygen, high temp, infection.. if you can use some frozen water bottles and less PPM, with 5.2 to 5.8PH then they can recover I think..

pH is 5.7/6, the pump is working 24/7.
I now see some roots growing from the main root, and they look white, will see how they develop.
I'm using the frozen water, what should my ppm be?

Beowuuulf · Apr 16, 2022

Tris said:
pH is 5.7/6, the pump is working 24/7.
I now see some roots growing from the main root, and they look white, will see how they develop.
I'm using the frozen water, what should my ppm be?

Not sure the appropriate PPM but for reference my 4 plants in this pic share 500 ppm and don't show any deficiency, based on my limited hydro experience i just feel 700 may be high at that stage. my nutrients say like 3 ml per L increasing per week. and I use something around that. For 3 weeks they don't look that behind, in the next week they should start growing rapidly

smokedareefer · Apr 16, 2022

Tris · Apr 16, 2022

smokedareefer said:
^^^

Sorry I don't understand

smokedareefer · Apr 16, 2022

Tris said:
Sorry I don't understand

I agree with the above post.

Less is more in dwc or rdwc

Moe.Red · Apr 16, 2022

I agree with the above that high PPMs will cause problems and generally the recommended dosage from the nute manufacturer is double what it should be but there are many factors.

Curious how you got root rot with pool shock in the water. You shouldn't see slime or anything like that - a biofilm does not grow in sterile water. Is this just lighting or are those roots dark?

Tris · Apr 16, 2022

Moe.Red said:
I agree with the above that high PPMs will cause problems and generally the recommended dosage from the nute manufacturer is double what it should be but there are many factors.

Curious how you got root rot with pool shock in the water. You shouldn't see slime or anything like that - a biofilm does not grow in sterile water. Is this just lighting or are those roots dark?

I dont see a biofilm, the roots are brownish, but im not sure if it is from the nutes. one plant whas perfectly white on wednesday, i changed the water, added more nutes and its now brown as well.

Moe.Red · Apr 17, 2022

Gonna need more info on the pool shock what when how much.

In a sterile res the levels must be maintained. H2O2, chlorine, they all need to be continuously added through the grow.

Nutes do not discolor roots as I have seen posted many times. Roots do become discolored with chemicals used to sterilize, it doesn’t just kill bacteria they also kill plant cells. Balance is the key. Too much and you impact root function too little and you get root rot.

Moe.Red · Apr 17, 2022

Take a look at this.

Slow growth and spots in leaves, root rot?

Slow growth and spots in leaves, root rot?

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