Nute Burn from low EC Nutes?. PLEASE HELP!!

Hi guys,

I am having problems with this grow. this is my 2nd grow and never had major problems before this. I grow in perlite, flood drain system.
I started getting nute burn about 2 weeks into bloom (reasonably bad burn), however the ec was only at about 1.8 when this happened.
I have backed it off and flushed it for 2 days with RO water, before returning the nutes to 1.2 EC. they recovered when I was feeding them PHed RO water, but as soon as I put nutes in they have started to go yellow and burn again??!! I have done this twice now with the same resonse. am I returning to a too high ec, although 1.1 - 1.0 isnt very high at all?
I am using a balanced nute, with PK13-14 (1mm - L) superthrive, fulvic acid in the nutes..
Can anyone help.
I am certain its nute burn of some sort as they recover straight away when they had ROed water, however I cant return them to a nute solution as they keep burning straight away! Please help!!??

I really need help guys, this has been going on for 2 weeks now!! and I have some big problems with these plants as they are now in the 5th week of bloom.. PLEASE HELP!!

id flush and start with half nutes for the first week and then back to normal schedule.

Everything half nutes?
Cos my nutes I am using less than half nutes which takes it to the 1.1 ec.
this is my delema.. should I stop the additives al together for the 1st week? or just put half additives as well?

Can anyone else help??

If they're really bad, maybe you should give them a break and just let them put their energy into growing instead of constantly trying to heal themselves, I'm no expert, just my opinion. good luck!

I'm not a hydro grower but shouldn't you be measuring ppm? Isn't it possible for a nutrient solution to have a very low EC and a very high ppm?

Hi,

As far as i know, the way that the ppm metres work is that they are ec pens that convert to ppm.
as there is not other easy way, other than to go to a lab to meassure ppm.

flush and start out light and work up til u see light signs of burn
maybe u didnt flush enough the first time

I am using a balanced nute, with PK13-14

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So you are using a balanced nute, then throwing that balance off with PK13-14. Try using the nute by itself for a while and see if that changes things. Please read Uncle Ben's, "The never ending abuse of phosphorus in flowering" article. It's on RIU somewhere, give it a search. I've never used additives and I've never had problems. I'm a fan of the KISS philosophy (Keep it simple, stupid)

Rc1 said:

Hi,

As far as i know, the way that the ppm metres work is that they are ec pens that convert to ppm.
as there is not other easy way, other than to go to a lab to meassure ppm.

Click to expand...

My bad if this is true, I know they use ec to rate purified water and I always thought it seemed similar to ppm. Sorry I don't have more to offer there buddy. Maybe you could just switch to soil and not have to worry about this ec nonsense.