Plants are yellowing please help

AS U CAN SEE THEY ARE YELOWING THEY ARE 3-4 WEEKS IN FLOWER AND IN A NFT TRAY SYSTEM USING FULL CANNA RANGE . PH 5.8 .. ENY HELP WOULD BE GREAT

http://www.flickr.com/photos/56136866@N06/5446039006/

Please some body help me lol

Drop the overall EC and manipulate your ratios. You are locking out elements as a result of toxicity in the media. The curl of the leaves indicates high heat or Nutrient burn. The shade of the leaves is consistent with Potassium and Magnesium deficiency. In coco, usually the result of Calcium and Sodium excesses.

Let's suppose you've been running a 2.0 EC. I'd suggest dropping it to more like 1.4 for the next three or four feedings (about 70% strength). Get A LOT of run off, like 1 to 2 gallons of run off for each plant. This will rinse out a few hundred ppm every time and bring the coco back into the proper ratios. You probably should work with a little extra run off (more like 30%) for the remainder of the grow.

Also, let's suppose your ratio is something like 2-2-1. I'd suggest altering it with a pk supplement to be more like 1-3-2.

So... less food over all, but add some PK, and Mag. Liquid Kool Bloom might be a good addition to get things right if you don't have anything around.

After 7 to 10 days you should see the plant improving. Then you can consider a last ditch effort final PK boost at 1.9 EC in the 6th week before dropping the EC to around 1.0 until you flush it and harvest.

Expect a slightly smaller harvest and a slightly longer flowering period.

thank you very much my freind !

you see wat it is im not using coco its just nft trays with the white matting and rockwool cubes .. how can i add more potassium and magnesium ?

i totally agree with pk im due to start pk 13-14 next feed

many thanks rep+++

could it be nutrient lock out of some kind ?

Hey chick-- you're ph is fine for NFT, but at what strength? And what kind of water?

It looks a little overfed because of the curl.

If it is a lockout, it would be MG, due to too much CA and or K in your mix.

My advice would be to fall back on the nute strength by 30% and go even on the NPK. This should get you back where you need to be, then go full bore on the program once everything looks OK. The last thing you want to do is nuke it with more PK, since it's obviously not deficient in either.

Shit, I saw Canna and my mind went all dyslexic on me and turned it into coco.

You could still have a salt build up, but it could most definitely be potassium PK 13/14 probably isn't the right solution. Potassium Phosphate can result in gnarly burning.

Anyway, I can't really say it is one thing or another to be honest. It is definitely some kind of lock out, and nutrient imbalance working in conjunction. Usually the result of a snowballing effect where the imbalance continues to build over time.

Flushing the cubes is a good start. Then you can go about dropping the EC.

I'd be able to give you a lot more advice if you could provide me with more specific information. Exactly what nutrients. Exactly the volume used per gallon for each solution over the last 4 weeks. And lastly, any EC or PPM information you have would be very useful.

I still think you need to drop the overall EC, but keep the Phosphorus level solid. So less food, but at a different ratio. DudeofLife sorta made it sound like I was suggesting you push more nutrients. This is most definitely not the case. Again, to be clear and specific, less food overall, but a different ratio as well. The only way to accomplish that is by reducing the main nutrient line and supplementing with a PK boost.

I'm not much of an NFT guy so I can't really help much more than this. Maybe one day when I've had a bit more experience actually running one. I totally thought this was a coco issue...

Hey, was wondering about that, lol. Solid advice, in any case. Def agree about dropping the strength--

Now we need to know what kind of water--

The new growth seems to affected the most, indicative of a trace element being troubled too.

its hard water .. im using canna aqua a and b at 25 ml per 10 L cannazym 25 m per 10l and boost 30 ml per 10 L

Calcium can interfere with Potassium and Magnesium uptake. I'd imagine the hard water isn't helping matters here.

You should probably look into filtering your water before using it. Brita filters will do a pretty good job dropping the starting EC of your tap water.