Can't figure this out - nute burn?

[Khyber420]

Hi all, Chocolope veg @ 6 weeks from seed. 70/30 Coco/Perlite mix, DIY 6 fixture LED COB dimmed to draw 200W at the wall. Fan leaves are starting to show significant brown spots, I thought maybe it was one of the following, but I've done everything from flushing to moving lights higher, calmag and still no luck.





Nute Burn ?
-feeding at full strength since week 2,
-foliar fed and misted while lights are on
-because the plant is bushy when I feed the solution splashes all over the place, including on the lower leaves
-flushed last week and watered with half strength nutes for a couple days

Calmag deficiency ?
-I'm using AN Sensi Cal about once a week, I've also done a foliar spray of Epsom Salts

Light burn?
-combination of water on the leaves and light

Here she is in the morning just as lights are about to go out. Any suggestions on what to try next ?
​

 

[Bernie420]

The brown spots are a cal deficiency at one point and the spots are not going to go away. The one pic is a nute burn probably from feeding at full strength. Plants look good wouldn't change anything except to feed at half strength and add microbes and humic acid to the feed once a week.

Learn how to grow in coco as far as watering and how to use cal/mag in that medium.

 

[Blent]

I have a similar strain and these spots have popped up for me also. Easily managed for me with rdwc system. I found that this strain doesn't like full strength nutes. Mine is pretty big and it takes just under half of the recommended nutes. I also saw these pop up when I added too much Cal mag and or pH adjustments. Keep the water clean and reduce your nutes a touch. They will not go away but you should see less appearing.

 

[Khyber420]

I have a similar strain and these spots have popped up for me also. Easily managed for me with rdwc system. I found that this strain doesn't like full strength nutes. Mine is pretty big and it takes just under half of the recommended nutes. I also saw these pop up when I added too much Cal mag and or pH adjustments. Keep the water clean and reduce your nutes a touch. They will not go away but you should see less appearing.

Thanks, I'm going to reduce nutrients to 50% for a week and see how it goes. Unrelated question, how long did you veg your strain for before flip? I've read these can stretch to almost double during flower.

 

[Blent]

Thanks, I'm going to reduce nutrients to 50% for a week and see how it goes. Unrelated question, how long did you veg your strain for before flip? I've read these can stretch to almost double during flower.

I vegged for 3 months with some intense training. Mine is Chocoloco which I think is the parent strain. 90/10 sat to Ind. Actually mate I found I had only 2 to 3 inches of stretch almost none at all... I wish I had vegged a bit longer and turned it into an even bigger monster. I'm just over 2 weeks into flower and yeah... Minimal stretch... Almost none... I've had little to no issues with this grow and I'll definitely keep the strain alive. Through veg the highest nutes I gave it was 800ppm. I had a lot of those brown spots appear once when I went too far with the other additives like calmag and silica which forced me to use more pH down than usual and the spots appeared in 2 days. I changed the entire Res and trimmed the leaves it was back to normal straight away

 

[Dmannn]

I vegged for 3 months with some intense training.

Maybe more nutrient was needed..

 

[Blent]

Maybe more nutrient was needed..

Nah it was stunted from the start mate. Had a rough month and a half... It was ready to flower after 2 but I was setting up a new system. I agree that is fairly long but it wasn't due to the nutes.

 

[Khyber420]

I vegged for 3 months with some intense training. Mine is Chocoloco which I think is the parent strain. 90/10 sat to Ind. Actually mate I found I had only 2 to 3 inches of stretch almost none at all... I wish I had vegged a bit longer and turned it into an even bigger monster. I'm just over 2 weeks into flower and yeah... Minimal stretch... Almost none... I've had little to no issues with this grow and I'll definitely keep the strain alive. Through veg the highest nutes I gave it was 800ppm. I had a lot of those brown spots appear once when I went too far with the other additives like calmag and silica which forced me to use more pH down than usual and the spots appeared in 2 days. I changed the entire Res and trimmed the leaves it was back to normal straight away

Actually, I did notice that the brown spots have become more prolific after I started PHing down to 5.8. Straight tap water and AN base nutes put solution PH around 6.0 ish. Going to switch to 50% nutes and leave PH at 6. Thanks for the help.

 

[ounevinsmoke]

What's the temp and humidity in there? any air flow?

 

[shawnery]

The difference between 5.8 and 6.0 isn't going to cause those issues. The only way that difference is going to cause issues is if your meter is uncalibrated.

 

[Khyber420]

What's the temp and humidity in there? any air flow?

Temps are about 20C during lights on and 18C off. Exhaust/passive intake is running 24/7 humidity is probably around 40%

 

[ounevinsmoke]

Temps are about 20C during lights on and 18C off. Exhaust/passive intake is running 24/7 humidity is probably around 40%

That's seems cold (a few degrees Lights on/off), I'm betting your humidity is higher than that with those temps. Im not a coco expert but would look into how often others water and how dry they let it get in between waterings. Looks like a dial in/environment problem considering you seem to have a grasp of what the plant needs nutrient wise. Since you have LED's heat from the lights will be minimal, you may have to supplement. Still I would put the lamps closer for deeper penetration in that bush lol. Stems/stalk needs light too. Wet to dry is the goal, but not too fast and not too slow in soil. I used to keep my soil damp too long and ran into issues of a similar nature. However, in hydro my media is always wet and thrived in the same room conditions. but I also had a stronger light with higher heat and control of humidity. Once you dial your environment in a smidge I think you will see better results.

 

[Ant081702]

Sorry to hijack i need help

I believe this is a phosphorus deficiency? Strawberry fields soil till soil nutes ran out. 5 gallon pots. i noticed 2 fungus gnats stuck to two colas Out of the whole garden so i sprayed BT and cut off my co2 week 6, and i fed twice every other day root cleaner also that week. Cyco nutrients suggest 5.5-5.8 for soil. I changed it to 6.2 week 6. My other plants in week 3 are starting to show shades of purple. At night the temp goes down to 60-65 but no less than 60. ppms at first were 1200 per instructions but figuring it was cookies i dropped it to 1000. My gorilla glues and gelatos aren't turning purple but are fairly smaller after you guys help me with this i can show pics of those. No mites no pm. No overwatering. sometimes they point downwards on the other day of feeding at night just before i feed but not full on wilt ever on those cookie plants the ones with the most purple. (In some of the images) The GG and gelato in week 6 have no purple really in one of the pics. However, the GG and gelatos in week 3 do just a bit in 1 of those pics. Also the leaves at the bottom end up turning brown and dying at the very bottom of the plant under the net. Advice on how to fix? I may have pica of the GG and Gelato that are smaller.

 

[Khyber420]

That's seems cold (a few degrees Lights on/off), I'm betting your humidity is higher than that with those temps. Im not a coco expert but would look into how often others water and how dry they let it get in between waterings. Looks like a dial in/environment problem considering you seem to have a grasp of what the plant needs nutrient wise. Since you have LED's heat from the lights will be minimal, you may have to supplement. Still I would put the lamps closer for deeper penetration in that bush lol. Stems/stalk needs light too. Wet to dry is the goal, but not too fast and not too slow in soil. I used to keep my soil damp too long and ran into issues of a similar nature. However, in hydro my media is always wet and thrived in the same room conditions. but I also had a stronger light with higher heat and control of humidity. Once you dial your environment in a smidge I think you will see better results.

Tent temperatures have always worried me, I tried raising lights on temps with a ceramic heater but it dries out the leaves quick. The problem is I'm in a nearly 2000 sq ft basement and I have to spend a lot on gas/electric to heat the entire space. Next winter I'll probably grow a cold weather Indica instead. Humidity wise, my house is at about 36%, if I turn off my inline fan the tent turns into a sauna quick, but with exhaust on the humidity inside the tent feels about the same as the rest of the house. Watering in Coco seems straightforward, once every two days, the bigger plant drinks quite a bit and I'll probably have to start watering her once every day pretty soon..

The spots seem to have slowed down since dialing back the nutes, and the old ones are changing from brown to dry dead spots.

 

[Khyber420]

Sorry to hijack i need help

I believe this is a phosphorus deficiency? Strawberry fields soil till soil nutes ran out. 5 gallon pots. i noticed 2 fungus gnats stuck to two colas Out of the whole garden so i sprayed BT and cut off my co2 week 6, and i fed twice every other day root cleaner also that week. Cyco nutrients suggest 5.5-5.8 for soil. I changed it to 6.2 week 6. My other plants in week 3 are starting to show shades of purple. At night the temp goes down to 60-65 but no less than 60. ppms at first were 1200 per instructions but figuring it was cookies i dropped it to 1000. My gorilla glues and gelatos aren't turning purple but are fairly smaller after you guys help me with this i can show pics of those. No mites no pm. No overwatering. sometimes they point downwards on the other day of feeding at night just before i feed but not full on wilt ever on those cookie plants the ones with the most purple. (In some of the images) The GG and gelato in week 6 have no purple really in one of the pics. However, the GG and gelatos in week 3 do just a bit in 1 of those pics. Also the leaves at the bottom end up turning brown and dying at the very bottom of the plant under the net. Advice on how to fix? I may have pica of the GG and Gelato that are smaller.

I'm no expert, but I've read that some strains turn can turn purple in lower temperatures. I also believe the plant naturally yellows during flowering, you could try what strawberry growers do and foliar feed some chelated iron?

 

[Ant081702]

I'm no expert, but I've read that some strains turn can turn purple in lower temperatures. I also believe the plant naturally yellows during flowering, you could try what strawberry growers do and foliar feed some chelated iron?

Why do you recommend iron?