Is it Overfertilizing or Overlighting burns?

Hi people, please help.

In pictures you can see burns of 7th week plants. The very tops are ok but some lower leaves are yellowing and burned. Is it fertilizing or HPS burn?

HPS 2X600W 90cm over plants.
7 Litre Soil and fertilized with canna start for 1/2 of dosage on the can. I feeded only twice in whole period.

I have to feed today, wonder should i pour plain water or fertilize with canna PK13/14 ?

Also thinking maby i should use some Epsom salts to stop yellowing?

thanks!

Try again,no pics.

srambo said:

Hi people, please help.

In pictures you can see burns of 7th week plants. The very tops are ok but some lower leaves are yellowing and burned. Is it fertilizing or HPS burn?

HPS 2X600W 90cm over plants.
7 Litre Soil and fertilized with canna start for 1/2 of dosage on the can. I feeded only twice in whole period.

I have to feed today, wonder should i pour plain water or fertilize with canna PK13/14 ?

Also thinking maby i should use some Epsom salts to stop yellowing?

thanks!

Click to expand...

Need pictures.

sorry. forgot.... now uploaded.

Are all of those leaves on the same plant?

im gonna guess over nute or atleast excesive nitrogen do u spray the leaves could also be burn if u had water sit on there and the light could have burnt them... could also be a ph issue

skunkpunk13 said:

im gonna guess over nute or atleast excesive nitrogen do u spray the leaves could also be burn if u had water sit on there and the light could have burnt them... could also be a ph issue

Click to expand...

I sprayed leaves with tap water, and PH was 7.5 maybe 8. could that be a problem? The water sit there for a while. PH - there were couple of times i forgot to adjust ph and it was also around 7.5-8.
about overnute - i was using two times a Canna Start which is for seedlings and should not be very strong... it was 1/3rd of the dosage.

what soil are u using??
i would keep the ph to 6.5
i wouldnt say it was the lights.
id flush ur plants & ph the run off water to see whats going on

little rich said:

what soil are u using??
i would keep the ph to 6.5
i wouldnt say it was the lights.
id flush ur plants & ph the run off water to see whats going on

Click to expand...

If i remember it was Plagron All mix which ph is 6.5. The lights are around 1 meter max in cooltube 600HPS X two lamps. Is it not too close?
Anyways i'm thinking that it might be the water spraying on leaves or lamps. Unfortunately i was feeding the twice the same time when ajusting lapms and spraying water on them, and burns happened both times, so fuck the hell i can't findout the truth.

how old are your plants??
so its not the lights if they a meter above the plants.
palgron all mix is a strong soil just like canna terra pro soil which i use & i have not fed my plants for 8 weeks from seed & are showing no signs of needing food.so im thinking your plants dont need any food yet & maybe they over fed.
i always ph my water with ph pen even tho my soil is bufferd to 6.5 so if i feed my plants with a solution of say 7.5 its gona alter the ph of my soil.so only way u can find out is if u check your run off after watering with ur ph pen.

well when i water i don't have any runoff water. About overfeeding - i wonder if i could to overfeed with canna start nuts? That food is for starting plant and should not be very strong and keeping in mind that i used 15 miligrams instead of recomended 40...
One thing that i have watered plants without adjusting ph and it was 8 - could it cause such disaster?
thanks!

Me thinks an 8.0ph is a little high for soil. It looks like some of the damage could have been caused by spillage on the leaves, but also looks like the yellowing is moving up towards the top also, I wouldn't think its a major issue just yet..hopefully someone with a little more experience will chime in for ya.

Yes, yellowing is going up on three different plants. I Don't think that was a spillage as i tried to be careful and didn't notice any spillages when watered. Could it be any nut def?
thanks!

I'd say flushem for week

Yeah Id say flush them too as growboy suggested, they dont look all that bad but also make sure you get your PH down from 8.0 to around mid 6-7. Ignore them for 2 or more days after the flush also........I'm thinking less is more for your plants right now.

srambo said:

well when i water i don't have any runoff water. About overfeeding - i wonder if i could to overfeed with canna start nuts? That food is for starting plant and should not be very strong and keeping in mind that i used 15 miligrams instead of recomended 40...
One thing that i have watered plants without adjusting ph and it was 8 - could it cause such disaster?
thanks!

Click to expand...

i would do what the other guys said give a good flush & get ur self a ph pen & start adjusting your ph i would keep ur ph to 6.5. ph does make a difference.

sounds like a ph fluxuation and light burn from spraying them and the water refracted the light and burnt them

OK guys, I'll use plain water for a while. Just I'm a little bit surprised that water drops could burn the leaves. Anyways please advice me what additives could i use to get bigger yield without burning them (bud candy's or smth...) or should i refrain from anything at all.

thank you all for help!

Optimal ph for soil is 6.8 but you can go from 6.5-7.0 without deff showing up but do as stated flush with 3 x the amount the pot will hold then give a half strength feeding with "n" you are also displaying a "k" deffiecency too with the yellow necrotic leafs ..........first off water ph isnt a giant deal if your soil ph is okay im not saying water ph isnt important but not as important if in hydro but fix your soil ph and that will fix your lockout issue

srambo said:

i sprayed leaves with tap water, and ph was 7.5 maybe 8. Could that be a problem? The water sit there for a while. Ph - there were couple of times i forgot to adjust ph and it was also around 7.5-8.
About overnute - i was using two times a canna start which is for seedlings and should not be very strong... It was 1/3rd of the dosage.

Click to expand...

Ph 8 is too high bro. Use a little baking soda mixed with water to flush your soil. Make sure the water you feed and flush with is always around 6.5
That should get your ph corrected.
Give it a week or so after you flush and check back in.