Yellow / brown spots on leafs newbie help

[tomcromp]

Hello its gotten worse again have a look at the next four photos, i haven't watered it yet as the soil doesn't look like it needs it. one looks like a brown colour or burn on one of the plants.
please help

tomcromp Reviewed by tomcromp on 10-03-2008. Yellow / brown spots on leafs newbie help Hello i have yellow/ brown spots on my leaf, i cut the lower leafs off as they where bad and drying out. I have been given it tap water which is ph6.2-8 and today for first time since planting i gave them some nutrients and ph was ph5.4-5.6 humidity 66% 25 degrees Celsius. they are under a 125watt cfl The lights have been on 24 hours I have now turned the light to 18-6 They are 2 G-13's, 1 Blue Cheese and 1 Violator Kush You can look at the pics below Please let me know what you think Rating: 5

[tomcromp]

anyone?

Cheers
Tom

[LuciferN]

Be sure to calibrate you're ph meter, be sure to follow the indication on the fetilizers bottles... The soil still look like really wet wait before you water the plants. I don't know what else to say.

[tomcromp]

my ph 7 calibration liquid comes in the post 2mo so will let you know the results need a watering 2mo the light just makes soil look darker than it is, anyone know about the brown spots? also the leafs i took photos of yesterday are almost dead loosing moisture and curling downward anyone know why?

Cheers
Tom

[LuciferN]

Curling may be heat stress, what is the distance of the plant and the CFL light, check the temps near the plant to be sure it's not too hot... Did you feed the plant any nutes ?

[tomcromp]

Wouldnt heat stress affect the upper leafs then work down not the other way round? i just gave them their first nutes 3/4 days ago.

[tomcromp]

still getting worse just watered them today as they where DRY. Watered Ph 6.
Run off water 5.4

Any sudgestions?
will upload some more photos tonight

cheers
Tom

[Greenthing]

my ph 7 calibration liquid comes in the post
Cheers
Tom

You will need calibration 7 and 4 to set your PH meter.

[tomcromp]

does any one have any experience caliberating this ph meter ive lost the instructions and cant find them anywhere!

[Greenthing]

does any one have any experience caliberating this ph meter ive lost the instructions and cant find them anywhere!

It's simple just put your PH meter in the calibration 7.0 stir it and leave it for a minute or two if your meter shows 7.0 its ok the same with the 4 if it shows4.0 thats fine.
there should be two small screws somewhere on the meter with 7 and 4 next to them, they are used to ajust your calibration if it needs ajustment.
Meter in fluid 7 ajust to 7.
Meter in fluid 4 ajust to 4.
Meters are very sensitive so be carefull when ajusting the screw, be gentle.
I check my meter for accuracy once a month.
You can buy probe cleaning fluid to clean the probe on your meter.
One more thing don't cross contaminate any of the fluids.
Hope this helps.