Late flower whole plant going pale

[chrondidily]

Just started the last two week stretch of flower yesterday and everything is looking nice and plentiful. Good buds all around and I know I'll be happy with yeild even with this old girl. Unfortunately over the past week this Master kush plant has started to get very pale and almost white. Some brown spots and dead leaves. Trichome production is at a minimum. I just flushed her 4 days ago and she seems to be getting worse. Water intake is very low compared to the others.

My ph is stable.

I'm running a full canna line with good filtered water. Cal mag once a week.

Stable temps and humidity with dehumidifier and mini split.

Stable co2 levels at 1200 ppm

Too much light? (I have 2 other masters that look fine)

Pot size is 7 gal possible root bound? Not sure.

Fungus gnats? Very minimal and hardly noticeable. I've seen worse infestations with no noticeable issues.

It's not over or under watering.

What do I do at this point with so little time to fix any issues? I'd like to try something in order to get some trichomes back in full effect even if they're only setting in a few days before chop.

Here's a shot of the effected plant as well as a shot of the whole room.

Thanks all! Cheers

 

[Mowgli Ma-Fên]

what ph is your "stable" ph?
first thought was Mg def

what are temps?im reading 33°C?
how "much"light? i mean 1200ppm co2 needs a lot of light

 

[Alienwidow]

Id say up the magnesium a bit. Not the calcium. If you can. I use magnum by humbolt. I run cal mag throughout the grow all the time. But then cut calcium out the last two weeks. I find i can get early yellowing if i switch to bloom nutes too early. You wont be able to get the color to come back but its fine. You will still have a great harvest by the look of the buds. Some strains also just yellow out more than others at the end. If theyre from seed that could be the case. Or if the light is right on top of it. Theres a bunch of things to figure out before you can pinpoint the problem. I do not think its the gnats, or rootbound.
Im thinking food switch, seed/strain, or light, and by food switch its kinda relating to not enough nitrogen in late veg and in early flower. I bet someone says ph

 

[chrondidily]

what ph is your "stable" ph?
first thought was Mg def

what are temps?im reading 33°C?
how "much"light? i mean 1200ppm co2 needs a lot of light

Ph 6.4 growing in FF ocean Forrest.

Temps are stable 75f dropped 3 days ago from 80f

4 600s in 5x9 tent so definitely enough light!

 

[Mowgli Ma-Fên]

ok. dont know if that is the problem,but u need higher temps (84F)when u use co2 at high levels.as well as more nutes than usual.

 

[Alienwidow]

Ph 6.4 growing in FF ocean Forrest.

Temps are stable 75f dropped 3 days ago from 80f

4 600s in 5x9 tent so definitely enough light!

Ya man, prooooobably the light. One 600 will cover a 4x4 so two of them would do 4x8. Youll probably get tight buds and lots of them but your not going to get a great return on the power consumption, and what happened to that plant might happen

 

[Alienwidow]

I do have to say i wouldnt change much. You look like your going to have a great crop.

 

[chrondidily]

Id say up the magnesium a bit. Not the calcium. If you can. I use magnum by humbolt. I run cal mag throughout the grow all the time. But then cut calcium out the last two weeks. I find i can get early yellowing if i switch to bloom nutes too early. You wont be able to get the color to come back but its fine. You will still have a great harvest by the look of the buds. Some strains also just yellow out more than others at the end. If theyre from seed that could be the case. Or if the light is right on top of it. Theres a bunch of things to figure out before you can pinpoint the problem. I do not think its the gnats, or rootbound.
Im thinking food switch, seed/strain, or light, and by food switch its kinda relating to not enough nitrogen in late veg and in early flower. I bet someone says ph

I was thinking I may have fed too much and caused some salt buildup so I dont want to hit them with a bunch of nutes two weeks from chop. Haha someone always thinks its the PH!

ok. dont know if that is the problem,but u need higher temps (84F)when u use co2 at high levels.as well as more nutes than usual.

Yea theve been at 85f to 90f their whole lives at 1500 ppm co2 the past couple weeks Ive been backing off both. I wouldnt think that would be the issue. Maybe since Ive backed off both co2 and temp the light is too much for them? Possible.

Ya man, prooooobably the light. One 600 will cover a 4x4 so two of them would do 4x8. Youll probably get tight buds and lots of them but your not going to get a great return on the power consumption, and what happened to that plant might happen

Oh return will be just fine should pull 4+. Power is cheap where im at. 250 a month with everything running full blast and not being super conservative in the rest of the house.

 

[Alienwidow]

I was thinking I may have fed too much and caused some salt buildup so I dont want to hit them with a bunch of nutes two weeks from chop. Haha someone always thinks its the PH!

Ya no you dont. At week 6 of 8 in flower i start to taper down bigtime. I wasnt implying adding a pile of food to fix the problem because at this stage you cant. Most people agree that nitrogen and calcium arent needed this far along as much. So adding calmag is out for me anyway. Thats why i switch to magnum since it has the mag still and sulfer. Ive noticed better product when i finnish that way. I taper the magnum down just like the other food and i start to replace calmag with it at week three from harvest. Ill blend it in with equal parts of calmag and then stop the calmag. Whatever, its been good to me so far and its cheap.

 

[chrondidily]

Ya no you dont. At week 6 of 8 in flower i start to taper down bigtime. I wasnt implying adding a pile of food to fix the problem because at this stage you cant. Most people agree that nitrogen and calcium arent needed this far along as much. So adding calmag is out for me anyway. Thats why i switch to magnum since it has the mag still and sulfer. Ive noticed better product when i finnish that way. I taper the magnum down just like the other food and i start to replace calmag with it at week three from harvest. Ill blend it in with equal parts of calmag and then stop the calmag. Whatever, its been good to me so far and its cheap.

Sounds like a good idea! Thanks man.

 

[chrondidily]

Thanks for all the help yall I guess well just try better next time ha! Ill take some pics of the buds tonight a few mins before the lights turn on. The master looks full perfect other than leaves and trichs, beautiful bright green with tons orange hairs. Unfortunately this is also my least frosty plant. Almost no frost really. Trichs under a scope look sad no mushroom or gofball on tee. Just the tee. Maybe Ill back my light in that corner down for the rest of the two weeks.

 

[stnr420]

Ph 6.4 growing in FF ocean Forrest.

Temps are stable 75f dropped 3 days ago from 80f

4 600s in 5x9 tent so definitely enough light!

There's ur problem. U have been overfeeding for weeks causing salt buildup in ur medium now u have total lockout. First of all u don't need calmag with canna nutes....Especially in soil! If in coco...maybe but def not soil. Also for ocean forest ph of 6.5 to 6.8 is ideal. When using soil like oforest u need to scale back with feeding and gradually increase as needed.

 

[chrondidily]

There's ur problem. U have been overfeeding for weeks causing salt buildup in ur medium now u have total lockout. First of all u don't need calmag with canna nutes....Especially in soil! If in coco...maybe but def not soil. Also for ocean forest ph of 6.5 to 6.8 is ideal. When using soil like oforest u need to scale back with feeding and gradually increase as needed.

Can I fix it

 

[stnr420]

Can I fix it

I think its pretty late to reverse totally...my suggestion would be just to use 1/4 strength nutes and achieve some runoff for the remainder of feed schedule.....honestly for next run if u want to use synthetics for feed....try promix hp, sunshine #4, or canna coco to match perfectly with ur feed. If u want to use soil like o forest....use an organic liquid feed like iguana juice or similar..

 

[chrondidily]

I think its pretty late to reverse totally...my suggestion would be just to use 1/4 strength nutes and achieve some runoff for the remainder of feed schedule.....honestly for next run if u want to use synthetics for feed....try promix hp, sunshine #4, or canna coco to match perfectly with ur feed. If u want to use soil like o forest....use an organic liquid feed like iguana juice or similar..

Thanks for the advice. Im going with coco my next run.