Yellow and dry leaves (Help)

i have 5 plants 3 strains (1 amherst sour diesel, 3 dedoverde haze, 1 unkown indica) they were seed. and now they are in bloom for 1 week.
im using Canna Tetra for soil and LST method.
i got 2 x 400 watt for 100cmx100cm and temp 26-28 humi %40-%50
im using general organics root booster, advanced nutrients grow, bloom, sensizym, b-52 for these plants.
and my pH is like 6.3-6.5
thanks for the help

-THESE PHOTOS FROM 1 WEEK AGO - http://imgur.com/a/tFNmh -
-THESE FROM NOW - http://imgur.com/a/ODNjy -

Looks like a Nitrogen deficiency to me. How many nutrients are you putting in your water, how much do you water, and how frequently do you water?

Do i have to flush them

Sativator said:

Do i have to flush them?

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Depends on what the problem is. If it is an N deficiency, then no, you wouldn't need to flush them. You would just add more food to their water. But it's hard to say exactly what the problem is without having some more information. How old was the Canna Terra soil you used? How much are you feeding them? How often do you water?

Nitrogen def, need to add higher nitrogen rich plant food. add a little more rooster booster(if high in N, sounds like it is), better still if it can be folier fed to the plants more the better, just remember to spray the plants when away from lights and wash off with clean water after a few hours. allow to dry and then replace under lights. rudi

It looks like it is being over watered.

jnonymous said:

Depends on what the problem is. If it is an N deficiency, then no, you wouldn't need to flush them. You would just add more food to their water. But it's hard to say exactly what the problem is without having some more information. How old was the Canna Terra soil you used? How much are you feeding them? How often do you water?

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Canna Tetra has high N and if i have to put 2 ml/L, im putting 1ml/L because of this.
This soil was fresh, unused.
When the soil gets dry im givin them a water(3-4 days)

sammy2 said:

It looks like it is being over watered.View attachment 3869734

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i dont think so dude it was night time photo

and this is the leaf from the dedoverde haze
http://imgur.com/a/SwMCZ

Sativator said:

Canna Tetra has high N and if i have to put 2 ml/L, im putting 1ml/L because of this.
This soil was fresh, unused.
When the soil gets dry im givin them a water(3-4 days)

Click to expand...

I agree that they don't appear over-watered. You may try lowering your temps a bit anyway tho. I still think it looks like they aren't getting enough N. If they were getting too much N, youd be seeing dark green leathery leaves, burnt tips, and possibly N-claw. I suggest doubling the amount of N they are getting. Keep an eye on newer growth - it should stop yellowing after a week or two.

Sativator said:

and this is the leaf from the dedoverde haze
http://imgur.com/a/SwMCZ

Click to expand...

Looks like potential pH problems. Are you checking your pH with a calibrated instrument?

If your plants are experiencing nutrient lockout - then this could be the reason they are showing deficiencies despite large amounts of food. In this case, doubling the food won't help. Instead you should flush to get rid of all the salt build up and then start off with pure water for a few days, pH'd of course.

I suggest making sure your pH is good before doubling their food like I mentioned in my previous post. Good luck!

Sativator said:

i dont think so dude it was night time photo

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Just a suggestion, hope you figure it out.

i gave one of my plants a root booster and bloom. and its getting bad
i think problem is soil i have to flush them today or tomorrow

i couldnt wait for flushin and i did
i put lil bit advanced nute bloom for balanced ph and we can see if its N defi or not

guys i think i found the problem. "salt"
i flushed them like 2 times 20 litre for each pot
do you guys think can i save them from the salt problem