Yellow leaves on 6th week

Some of the plants are bright green, they look super healhy and some others have yellow leaves. They’re all fed the exact same thing at the same time and are roughly all the same size. Any idea what it could be?

What’s your temps ? I see your leaves crispy they look like they locked out of something. How often are you feeding/watering?

Jdubb203 said:

What’s your temps ? I see your leaves crispy they look like they locked out of something. How often are you feeding/watering?

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30c, im under leds so the leaf temp is around 24-26c.

I water every 2 days generally speaking

Since your under leds your temp should be higher like low 80’s. I had the same problem plants having trouble taking in nutrients. You want them to be green all the way through for the most part.

how many feeding pumps and tanks have you got? if your useing one main tank, its a nute problem. you will be fine where the nutes are first taken up, but the more the nute solution travels through the pots, the more nutes are taken up bu the first lot of plants. the later ones wll have a lower concentration of nutes

They look hungry. And i see a lot of "taco" leaves..... You sure your leaf/bud temp is as low as you say? If my ambient temp is 75, leaf/bud temp is usually about 80. What is the medium? Every 2 days might not be enough, those look like pretty small pots...

JoeBlow5823 said:

They look hungry. And i see a lot of "taco" leaves..... You sure your leaf/bud temp is as low as you say? If my ambient temp is 75, leaf/bud temp is usually about 80. What is the medium? Every 2 days might not be enough, those look like pretty small pots...

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Yes I use a ir thermometer, with led there’s less radiative hear than with hid. Medium is soil

go go kid said:

how many feeding pumps and tanks have you got? if your useing one main tank, its a nute problem. you will be fine where the nutes are first taken up, but the more the nute solution travels through the pots, the more nutes are taken up bu the first lot of plants. the later ones wll have a lower concentration of nutes

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I’m not sure I understand. My whole tank is comstantly mixed and ph regulated.

I have a theory. Maybe since I put the pots on upside down buckets, the pots dont drain as well and they get a salt build up and then caused nute burn?

I don’t know , I see the bottoms look over ferted to me, could have been in the past but that looks like a dry/overfert problem to me.. The burn on the tips and the crispy crinkly look .. water more often less food, give them a good rinse before getting back to your schedule.. tbh most leaf sets look rough in the pic.. some of it almost looks like ph fluctuation too.. again I’d flush them and start again, shouldn’t really hurt much, run straight water for a day or two , making sure you’re ph is good, and get back to feeding a bit light gradually back to full nutes.. Less is more especially when problems arise.. get maybe some better pic not under your light , cause I’m pretty sure I see ph damage

either way there is moisture stress, and over fert I’m 99%.. u don’t want them to go into lockout which is why is flush

Looks like fert burn

canope said:

View attachment 4663497
Some of the plants are bright green, they look super healhy and some others have yellow leaves. They’re all fed the exact same thing at the same time and are roughly all the same size. Any idea what it could be?

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Can't be sure from the picture provided but it looks like you might have powdery mildew.

canope said:

Medium is soil

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What's that mean exactly? You are running drip lines, drain to waste? What EC are you running at and what's your runoff situation?

PJ Diaz said:

What's that mean exactly? You are running drip lines, drain to waste? What EC are you running at and what's your runoff situation?

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Drain to waste, drip lines, 800-1100ppm, I never checked runoff, I should right? What ppm should runoff be? Is runoff ph important?

Last time my plants yellowed top down, like what looks to be happening, i had bud rot starting in all the tops. Whats your humidity at?
Also, 1100ppm on a drip seems like quite a bit but its hard to tell how big the plants are from pictures.
Not sure how much it matters but the pots, from what i can tell look pretty small for those size plants. Especially since there is 'soil' in them.

800-1100 is usually a ppm level for hydro. soil traps nutrients and the water amount tends to be less as the bucket is full of soil which takes up space in bucket. To feed that much is hot stuff, not in a good way. You're in late flower, these plants die naturally in late flower. I don't think I'd fert anymore. Let them die and harvest.

What sort of "soil" are you using? How much and how often are you watering? Does the soil dry out between waterings? Could be a case of root rot and /or excessive salts due to nute buildup.