What's wrong? Please Help

It's 9 plants under a 600 watt HPS is this just Light Burn or light stress? The plants started by just turning yellowish top first but I turned my 600 down to 450 @ 75% power and came back to this when I woke up. How do I fix this is it just light burn?

Looks kinda light light stress and high heat maybe how far is your light from your plant can you keep you hand right above the canopy comfortably for a couple min? If not its probably too hot for you plants too. Do you have fans blowing? Maybe some hot spots are forming

What have you been feeding? How much? How often?

First glance looks like a heat/nute/ph issue.

How hot is your room? You have leaf curl.
What do you feed with, how often and ppm?
What medium do you grow in? What's your ph?

Idk how it could be heat stress the room temp is like 65 before the light turns on light distance was 18" @ 600 watts now I set it to about 22" @ 450 watts. Plants are week 4 of flower in 3 days. 660 ppm, Flora Nova Bloom, & Cal mag Plus. Bubbleponics. The leaves were just turning pale, like light green then boom man, came in this morning. Ph is 6.0 set it at 5.8 and let it rise to 6.1. Been cycling water weekly. I raised lights to 24" and dimmed to 50% 300w but I don't want a lot of stretching.

I can't find a lot on zinc or mag deficiencies but heat spots sounds good that is the area directly around the bulb but I only have 6-8" left of raising.

2.Cor4.16 said:

I can't find a lot on zinc or mag deficiencies but heat spots sounds good that is the area directly around the bulb but I only have 6-8" left of raising.

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bend and tie them down/away from the light.

you could have some light burn maybe but I can say with certainty you have magnesium def or magnesium lockout

even the healthy plant in the back is showing mild signs

the one closest to the light is showing it first because its more amped up from the high lumesn so itll show first
and it might be a plant that requires more nutes than the other

we need to know what your feeding to determine if your low on magnesium or high on calcium or potassium which can lock out magnesium

(zinc... no your not having any issues with zinc)

tell us what nutes your using

and how many mls per gallon

18" should be fine with a 600

Flora nova bloom @ 7.5 ml per 4 gallons with 1.5 ml of cal mag plus, normally I'd be running other adds and a different base but I ran out and literally the only thing any place had was ace and it was the flora nova line. My nutrients are suppose to be here tamaro. Ph 6.0 ppms are 660 it's at like 24" now and it's still not stopping the advance of yellowing.

flora nova 1 part.... 7.5mls per 4 gallons that's less than 2mls per gallon
that's not nearly enough..not even close

mix per gallon
8mls floranova

and that's still not a high amount

you don't need the calmag

the flora nova is actually a good nutrient

id keep using it if you have it

easy 1 part mix

the only thing
if you need to ph adjust you might consider sulfuric acid (battery acid) and not the std phosphoric acid (ph down)

the flora nova 1 part has a lot of P

Thank you I just changed my Rez and did 8 the plants are starting to look a little better but I think that every night for the past couple days and I wake up and it's worse. I ph to 5.8 and dropped the cal mag as well. After the leaf becomes that pale will it regenerate or is it just better to cut off necrotic tissue to help the plant recover?

it wont come back

you can trim it back

if you stick with the flora nova
because it so high in P

when you get a chance
get some battery acid from the auto parts store for $10

fill an empty 1 gallon jug half way with plain water
add the pint of acid and then top off until full with more plain water

if you cut it with water itll be easier to work with and closer to the strength of the ph down (phospric acid) your using

youll save some money too

the phosphoric acid adds more P and you don't need it

Originally Posted by OldPhart
Basic cheat sheet:
Ec goes up, PH goes down=plants require less nutes.
Ec goes down, PH goes up=Plants require more nutes (if you see def.)

could be wind burn...check your fan. is it blowing on the one side, cause the other side looks ok....also you can water her more..