Golden Leaves- Not in a good way...

[curbiechris]

I use RO water.
The PH does fluctuate. It's always dropping to 5.3. Taking up more water than nutes.
But it get's fixed everyday.
Salt build up, eh?
So a flush of just RO water?

 

[Guest]

I would flush for two waterings, or so. then start back with a mild feed schedule with out any addatives. Try to stabilize the damage happening, and then get them to harvest. Next time i would not use the same soil or whatever medium your using. I would get new medium from the store. Clean all your tanks, buckets, drippers, etc.. try to sterilize if you can.
I have had leaves that looked like that before, and couldn't figure it out. I quit spraying the plants and it helped i think. hope it works out for you,, be well, peace.

Cannabismavin,

 

[Blackmelo]

It could very likely be heat related.

How do you ventilate your room + how strong are the fans.

What light do you use and how close is it?

One thing I noticed is that you tried something for 1 day, and then decided you saw no results, however nothing is going to change much in a day, even if you did suddenly find the right solution. Plants are very slow growing and a nute burn or ph stress takes a few days to show up, it takes just as long to then see an improvement.
I know that might sound a bit frustrating because I am telling you that it might take you quite a while to find the cause of this problem and in that time your plants will suffer quite a bit but if you manage to find out what the problem is, at least you will have gained some valuable growing experience from it.
I know that is how I learnt how to grow perfect weed.

If you try something to help your plant you will have to give it more time to see the effects.

If it is not nute burn or ph stress or heat stress, then maybe you need to have a look at what individual nutrients you are feeding your plants. This might sound complicated but it is pretty simple really.
It really does help to know exactly how much nitrogen, phosphorous, potassium, magnesium, sulphur, zink etc you are feeding your plants and how much your plants actually want.
I managed to solve alot of leaf issues I used to have and increase my yields by working out how much of each nutrient was in my fertilizer. I then changed the amounts slightly to get the amounts cannabis likes.

This is the nutrient calculator you will need to do this : http://www.angelfire.com/cantina/fourtwenty/articles/profiles.htm

 

[Guest]

A major mistake new to intermediate experienced growers is they tend to assume its a deficiency and throw more nutrients at the problem. When almost 90% of the time it is caused by Ph fluctuations or salt build up from fertilizers.

^^^^
Listen to those words carefully, grasshoppers. They are very correct.

 

[curbiechris]

yeah i flushed. hopefully it helps.
we'll see what happens in a couple days.

 

[curbiechris]

well.. for the past two days the PH has been stable.
it was fluctuating before due to more water uptake than nutes.
now it's steadily @ 5.9-6
leaves are not getting worse. they are not getting better. but, hey, this is a good sign.

salt build up, eh?
never knew of that. good to know now

THANK YOU!

 

[minds_I]

Hello all,

CC, You will not see much change in the previously damaged leaves...look for improvement int he new growth.

For what its worth it looks like a phos def. to me.

Regardless of what it is, like the guy said, you must give it some time to show the effects.

minds_I

This was treated with a foliar feeding of 1/4 strenght MG 0-7-7 and one tsn/gallon epsom salts. Fed the soil with a ewc/guano(3-10-1)/kelp/molasses tea and 3cc/l ej bloom (0-3-1) AC vinegar to pH at 6.5.

I figured it would be a broad spectrum approach. They have responded but the damaged leaves stopped getting worse while the new growth is not showing the same pattern.