yellowing all over ....HELP ME !!!

[Mr Bloom]

Hi Guys

I have two speed haze plants that are yellowing from the margins on most leaves, the plants still look pretty good except the colour. They are 5-6 weeks from seed and they stink. I also have two other autos in the same room that are doing fine (healthy green).

The Hazes have been getting nutes at half strengh at 6.5 ph but the run off is coming out at 5.8 whereas the other two healthy ones its going in at 6.5 and the run off is 6.5

The smell of the hazes mean I have to keep negative air pressure at all times to stop leaks and the hazes are the plants closest to the intake, also the tent is directly on the concrete floor which gets pretty cold at night.

Im sitting at work pondering my plant issues and thought id come here to see if anyone thinks I may be right in thinking the cold is causing some kind of lockout In my root zone

400 dual spec hps
Pro mix soil with added perlite
Canna terra/bloom nutes at half strengh
Lights are on for 24 hrs everyday (or temp drops to much)
5 inch exhaust fan through cf (running constantly like lights)
No pests

 

[blue]

Hi IBLH

It looks like your soil PH is out of nute uptake range and causing lockout

Here's some good info on ph.....(by GoAuto6)
If your runoff pH is higher than your starting pH, use this equation to determine your soil pH:*
Soil pH = Runoff pH + Difference

If your runoff pH is lower than your starting pH, us this equation:
Soil pH = Runoff pH - Difference.

For example, say your the starting pH of your solution before it goes in is 6.5 and the pH of your runoff is 7.0. The difference is +0.5, so using the above equation:
Soil pH = 7.0 + 0.5*
Soil pH = 7.5

If your starting pH is 6.5 and your runoff is 6.0, your difference is -0.5 and using the above equation:
Soil pH = 6.0 - 0.5
Soil pH = 5.5
​

It looks like your soil is about 5.1 so you'll need to raise the PH considerably

Presuming your in soil and not coco, you should try to raise it to about 6.3 / 6.4ish

Hope this helps
Blue

 

[Mr Bloom]

Thanks for reply Blue

Just gave them both a good flush. Also put a few inches of cardboard on the bottom of the tent to try and stop the cold floor from being a problem.

Am I right in thinking that I need to up the PH of water to say 7.5 for watering the hazes to try and bring the soil ph back up to 6.5 ish ?

 

[Dominas999]

Sounds like Manganese deficiencies which are often caused by a pH that is too high, or if the plant is getting too much iron.
If you have a manganese deficiency in soil, try to correct pH to 6.0 - 6.5l. In hydro, correct pH to 5.5 - 6.0. You are looking to avoid higher pH ranges, as this is where manganese deficiencies are most likely to occur.
Flush your system with clean, pH'd water that contains about half the correct amount of nutrients needed by the plant. Watch to make sure that the problem starts to clear up within a couple of days.

Sending karma bro :smokebuds:

 

[Mr Bloom]

Here is a pic of the worst affected ladyboy (found 2 little flowers at bottom of main stem while flushing on both Hazes) I can say it looks 10 times worse under the HPS

 

[Mr Bloom]

I tried misting with epsom salts for a week but it has had no effect