Hey guys,
So first of all, some info:
Nutrient mixture:
One out of the 4 plants has these problems, all others are 100% healthy, just some very light tip burn here and there with the typical brown-ish tips. Here is a general view into my 4x4 / 120x120 tent with the 4 autos:
The troublemaker is the plant on the front right. As of ~3 weeks ago, it started growing out with bright yellow tips. They do not turn brown or crispy, they keep being yellow, and the yellowing slowly spreads in a very weird way. Sometimes it become more and more yellow, spreading downwards, other leaves turn a blotchy yellow for some reason, I've never seen this.
What I have also noticed - All other plants seem to have more "sturdy" leaves. They just feel steady, thick, and strong. This plant with the yellow tips looks fine, but whenever I touch this plant, the leaves seem way too "soft" for some reason, there is no stability inside of them. The other plants leaves are like cardboard, while the leaves on this plant feel like toilet paper. Very soft, wobbly, but generally healthy looking and NOT droopy. it's weird!
Here are a few examples of the early symptoms:
As you can see, no crispiness, they just keep being yellow, and it "spreads" downwards onto the leaf material. Some leaves less, some more. This apparently only happens on the top canopy, so in my mind it might've been light burn / stress, but I already lowered the PPFD to around 400 which is rather low, even at 24/0, and it kept spreading more and more over the span of a whole week. I also lowered EC from 2 to 1.8, but nothing changes.
Here is the strange damage they all get in the top 25% of the canopy:
What am I dealing with here? I know that this doesn't seem too bad. Problem is that I'm transitioning into flower now, and dead foliage means dead foliage, no new stuff will grow anymore. I want to make sure that I know what all of this is about, so I can fix this in case of an emergency. I am clueless, I've had my fair share of problems over the years, but this one is new to me.
FYI - I cannot really measure runoff, as I do not topwater these, they have been bottom-fed for 30+ days now, and are all around 42-46 days old. If I topwater, the EC will shoot through the roof inside the pots, it is what it is with these bottom-fed autopots.
So first of all, some info:
- 3.9gal / 14L autopots, 4 of them, and 12gal / 47L Reservoir
- Coco / Perlite 60/40
- Canna Coco A+B, Canna Calmag Agent, Grow Genius MSA (Sometimes)
- 75% RO / 25% tapwater, my tapwater itself is too unstable, heavy PH problems, so mixing with RO
- Speedrunseeds Acid Snow & Granite Haze F5 autos, early flower, stretch almost over
- MarsHydro FC6500-EVO @ 60% intensity, around 25 inches above the canopy, around 500PPFD @ 24/0 cycle
- Apera PH60, fully calibrated, Milwaukee Instruments EC Pen
- EC currently at 1.9, PH at 5.65 in the reservoir to avoid the heavy PH spike until it reaches the roots
- Exhaust fan, oscillating fans, everything running normally
- Temps around 76-79°F / 24-26°C, humidity 65-70% (Can't fix this currently)
Nutrient mixture:
- 75% RO Water + 25% Tapwater, giving me a base EC of 0.1
- I then add Calmag until I hit 0.6EC, as otherwise they will show severe mag deficiencies
- After this, Canna A+B until I reach 1.8EC (2EC before)
- PH to 5.65 in the reservoir, let it float between 5.60 and 5.70
- Wavemaker running 4 times a day, 15 minutes each time
One out of the 4 plants has these problems, all others are 100% healthy, just some very light tip burn here and there with the typical brown-ish tips. Here is a general view into my 4x4 / 120x120 tent with the 4 autos:
The troublemaker is the plant on the front right. As of ~3 weeks ago, it started growing out with bright yellow tips. They do not turn brown or crispy, they keep being yellow, and the yellowing slowly spreads in a very weird way. Sometimes it become more and more yellow, spreading downwards, other leaves turn a blotchy yellow for some reason, I've never seen this.
What I have also noticed - All other plants seem to have more "sturdy" leaves. They just feel steady, thick, and strong. This plant with the yellow tips looks fine, but whenever I touch this plant, the leaves seem way too "soft" for some reason, there is no stability inside of them. The other plants leaves are like cardboard, while the leaves on this plant feel like toilet paper. Very soft, wobbly, but generally healthy looking and NOT droopy. it's weird!
Here are a few examples of the early symptoms:
As you can see, no crispiness, they just keep being yellow, and it "spreads" downwards onto the leaf material. Some leaves less, some more. This apparently only happens on the top canopy, so in my mind it might've been light burn / stress, but I already lowered the PPFD to around 400 which is rather low, even at 24/0, and it kept spreading more and more over the span of a whole week. I also lowered EC from 2 to 1.8, but nothing changes.
Here is the strange damage they all get in the top 25% of the canopy:
What am I dealing with here? I know that this doesn't seem too bad. Problem is that I'm transitioning into flower now, and dead foliage means dead foliage, no new stuff will grow anymore. I want to make sure that I know what all of this is about, so I can fix this in case of an emergency. I am clueless, I've had my fair share of problems over the years, but this one is new to me.
FYI - I cannot really measure runoff, as I do not topwater these, they have been bottom-fed for 30+ days now, and are all around 42-46 days old. If I topwater, the EC will shoot through the roof inside the pots, it is what it is with these bottom-fed autopots.
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