Boylobster
- 267
- 18
Greetings and thanks to anyone looking. I've been away from the Farm for a while, and I hate to come back on my knees, but I need help. My current grow was off to a fantastic start, but about 2 weeks into flowering, I noticed a general yellowing sweeping through the plants, worst in the fan leaves, and worse in some plants than others. Now they're just past 4 weeks in flower and the problem continues to worsen. If it goes on like this, the harvest will surely be ruined. Expert (or any) guidance would be really, really appreciated.
I grow in the same system, same clones, same nutes, every single cycle, but this problem is entirely new. I'll outline the variables that have changed in a moment.
The basics of my setup: 4x600W Lumateks, Ushio HPS, UnderCurrent DWC, RO water, House & Garden nutes @ EC ~350, pH 5.6-5.9, Capulator's Beneficials, Air-cooled hoods, CO2 supplementation @ 1000ppm... I think that about covers it.
The Pics: These pics aren't great; I had to borrow a friend's camera, and the contrast between the still-healthy growth and the yellowing leaves isn't as glaring as it should be. I'll take some photos during their night cycle, and hopefully the flash will show just how bad this is:
The last shot probably best illustrates the difference in color between the parts that are still relatively well and the those that are suffering. A couple plants have yellowed almost completely from top to bottom - it's f***ed.
The Details: My last run had a serious problem with falling pH, which I attribute to the accumulation of unwanted microcultures in the system. I've never sterilized heavily, the way I probably should between runs. This led me to Cap's Beneficials, which I'm using for the first time from the start of this run. As I said, everything looked *fantastic* until about 2 weeks into flower. The system was cleaned and sterilized heavily before this run began, also.
So, Cap's Beneficials is a new factor. Also, this is my first real run with air-cooled hoods and CO2 supplementation. These are the only two significant changes I can think of.
The system has been flushed recently, and pH is stable as a rock, riding right around 5.6-5.8 without any need for adjustment. Likewise, feeding has been strong and very consistent - seems like the nutrient rez is about as concentrated as it should be.
SO. General yellowing, starting with the older fan leaves? Nitrogen deficiency or lockout? What the hell is going on? Why now? Why just when I started to flower? How do I salvage this run??? Please help! If I can provide any more photos, info, or details, just ask! Thanks so much for reading!
Cheers,
BL
I grow in the same system, same clones, same nutes, every single cycle, but this problem is entirely new. I'll outline the variables that have changed in a moment.
The basics of my setup: 4x600W Lumateks, Ushio HPS, UnderCurrent DWC, RO water, House & Garden nutes @ EC ~350, pH 5.6-5.9, Capulator's Beneficials, Air-cooled hoods, CO2 supplementation @ 1000ppm... I think that about covers it.
The Pics: These pics aren't great; I had to borrow a friend's camera, and the contrast between the still-healthy growth and the yellowing leaves isn't as glaring as it should be. I'll take some photos during their night cycle, and hopefully the flash will show just how bad this is:
The last shot probably best illustrates the difference in color between the parts that are still relatively well and the those that are suffering. A couple plants have yellowed almost completely from top to bottom - it's f***ed.
The Details: My last run had a serious problem with falling pH, which I attribute to the accumulation of unwanted microcultures in the system. I've never sterilized heavily, the way I probably should between runs. This led me to Cap's Beneficials, which I'm using for the first time from the start of this run. As I said, everything looked *fantastic* until about 2 weeks into flower. The system was cleaned and sterilized heavily before this run began, also.
So, Cap's Beneficials is a new factor. Also, this is my first real run with air-cooled hoods and CO2 supplementation. These are the only two significant changes I can think of.
The system has been flushed recently, and pH is stable as a rock, riding right around 5.6-5.8 without any need for adjustment. Likewise, feeding has been strong and very consistent - seems like the nutrient rez is about as concentrated as it should be.
SO. General yellowing, starting with the older fan leaves? Nitrogen deficiency or lockout? What the hell is going on? Why now? Why just when I started to flower? How do I salvage this run??? Please help! If I can provide any more photos, info, or details, just ask! Thanks so much for reading!
Cheers,
BL