Leaf browning from within, starting from veins

[regrat]

Hi

Let me quickly show you the problem, dont want to make the post too long to read

http://shrani.si/f/18/oz/QYIHCQW/imag3352.jpg start of the problem (brown veins)
http://shrani.si/f/26/r/xYlhffr/imag3341.jpg progressing
http://shrani.si/f/1y/Ze/DRWYCyj/imag3354.jpg dead leaf

http://shrani.si/f/A/Wz/3LOYjIda/imag3349.jpg things not that bad overall

-so i got 1m2 box (4x4ft)
-400w hps
-9x 2 month old plants (month veg + month flower)
-30L (8 gal) airpots with added plagron biosupermix (http://www.dutch-headshop.com/en/bio-supermix-soil-improver-liter-plagron-p-835.html)
-watering only with water
-sufficient airflow

I know some plants are experiencing minor overfert but im not sure what that browning of the veins means. Could it be overfert also ? or what? anyone got an idea?

thanks for your help!

 

[Snype]

Hi

Let me quickly show you the problem, dont want to make the post too long to read

http://shrani.si/f/18/oz/QYIHCQW/imag3352.jpg start of the problem (brown veins)
http://shrani.si/f/26/r/xYlhffr/imag3341.jpg progressing
http://shrani.si/f/1y/Ze/DRWYCyj/imag3354.jpg dead leaf

http://shrani.si/f/A/Wz/3LOYjIda/imag3349.jpg things not that bad overall

-so i got 1m2 box (4x4ft)
-400w hps
-9x 2 month old plants (month veg + month flower)
-30L (8 gal) airpots with added plagron biosupermix (http://www.dutch-headshop.com/en/bio-supermix-soil-improver-liter-plagron-p-835.html)
-watering only with water
-sufficient airflow

I know some plants are experiencing minor overfert but im not sure what that browning of the veins means. Could it be overfert also ? or what? anyone got an idea?

thanks for your help!

With the limited data that you have supplied it either looks like a lockout due to pH issues or you are in need of a specific nutrient or a combination (possibly Magnesium, Zinc and/or Phosphorus). The reason why I wouldn't think it's over fed is because you got through a long time with the same mix without adding anything.

What I would do is check the Soil Run-Off. Slowly pour 6.8 pH water through the container until you get about 50 mL of Run-Off into a jar and test the pH of it. I like to see my pH in the range of 6.4-6.8 in my Soil Run-Off. If it is not in this range, you most likely have a lockout and don't need to add any food. You just have to get your pH back in line.

 

[regrat]

i have hard time containing runoff however i think it's very likely that its a ph issue.

do you think problem could fix itself if I start watering with 6-6.5 ph'd water from now on ?

 

[Snype]

i have hard time containing runoff however i think it's very likely that its a ph issue.

do you think problem could fix itself if I start watering with 6-6.5 ph'd water from now on ?

No I don't. You won't know what to do until you check the Run-Off. You have no idea how high or low that it is until you check it. If the containers are too big, to do in your room because you don't have a place to put it, you can do it in the bath tub and lift it up when you see water coming out of the bottoms and let the first 50 mL or so collect into a jar or pot.

 

[SirSteely]

i have hard time containing runoff however i think it's very likely that its a ph issue.

do you think problem could fix itself if I start watering with 6-6.5 ph'd water from now on ?

You need to test the runoff so that you can judge the ph of the soil.For example.. If soil ph has raised to ph 8.5( for some reason), you will never get it back to ph 6.5 by watering with just ph 6.5 water. You would need to water with a lower ph to have an effect on the soils ph.

So test your runoff and see whats going on. I have dealt with ph shifts in soil and they are easy to deal with if your armed with information.
Good luck!

 

[regrat]

the thing is, im running scrog so i cant really move the pots...
i was thinking, since my water is ph 8+, that the ph is too high

 

[regrat]

i will try and figure something out to get that runoff, im very curious now

 

[Snype]

the thing is, im running scrog so i cant really move the pots...
i was thinking, since my water is ph 8+, that the ph is too high

If you knew your water was 8+, you should have been pHing your water the whole time to 6.8. pH is very important in growing cannabis. Most problem that I see with growers are pH related.

 

[regrat]

yeah, as suspected ph of the runoff was about 8. I will start watering with ph'd water to about 6. think that's gonna do ? thanks for your help.

 

[Snype]

yeah, as suspected ph of the runoff was about 8. I will start watering with ph'd water to about 6. think that's gonna do ? thanks for your help.

That might take a long time to get your Run-Off down like that. I like to fix my runoff at the time and not wait weeks to try and get it down. At least you found your problem. Good luck!

 

[SirSteely]

Dont be afraid to drench it once with ph 5 water and drop it down so it can access the nutes it needs.