Is this light burn? (Day 64 autoflower)

WarioSmokinWeed

New Member
Thought it was an N deficiency at first but starting to think it's light burn but I'm not sure. Leaves closer to the light are more yellow and starting to get brown, bottom growth is more green. I'm using the Spider Farmer SF1000 light and it's 12 inches away.

20210219_200735.jpg

Should I move the light further away or does this not look like light burn?
 

WarioSmokinWeed

New Member
Looks like nutrient lockout / nute burn, they look the same, but not bad, where did you get those beans?
ah I see. They're white widow autos from ILGM.

I'm planning to cut out N for the next feeding and so forth, is there anything else I should do besides cut back on nutes?
 

Soul Dwella

Well-Known Member
Thought it was an N deficiency at first but starting to think it's light burn but I'm not sure. Leaves closer to the light are more yellow and starting to get brown, bottom growth is more green. I'm using the Spider Farmer SF1000 light and it's 12 inches away.

Should I move the light further away or does this not look like light burn?
Looks like light stress to me, 12 inches is pretty close. Ive also noticed that plants under LED's are stressed more easily by the light in lower temps. Plants under LED's prefer warming temps, in the 80's, and a light supplement of CalMag...Only my humble novice observations tho...
 

Dank Bongula

Well-Known Member
Looks like light stress to me, 12 inches is pretty close. Ive also noticed that plants under LED's are stressed more easily by the light in lower temps. Plants under LED's prefer warming temps, in the 80's, and a light supplement of CalMag...Only my humble novice observations tho...
Depends on the LED...I've read 12 is what is suggested by them (them being SF) during flowering.

Could always raise it a few inches and see if it improves though...it does look like light stress with the damage being what it is though and the leaves kinda pointing up
 
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Mcwhippin420

Well-Known Member
I had my led around 12 during veg up until about a week in flower then I noticed slight cupping amd what not , moved to 18ish and it's been fine.. think there 14ish atm still ok so who knows
 

WarioSmokinWeed

New Member
Looks like light stress to me, 12 inches is pretty close. Ive also noticed that plants under LED's are stressed more easily by the light in lower temps. Plants under LED's prefer warming temps, in the 80's, and a light supplement of CalMag...Only my humble novice observations tho...
yep, I moved it higher up anyways last night just in case, up to 14.5 inches because that's the highest it can go...temps fluctuate between 72-78 degrees and I do add cal mag to any water that I give it. hoping that it starts looking better soon
 

Soul Dwella

Well-Known Member
yep, I moved it higher up anyways last night just in case, up to 14.5 inches because that's the highest it can go...temps fluctuate between 72-78 degrees and I do add cal mag to any water that I give it. hoping that it starts looking better soon
you can get ur temps up by dialing down your extraction fan as well. If its not adjustable or connected a device that auto regulates when it comes on, you can put it on a regular timer leaving it off 8-10 hours during lights on, then on the rest of the time.
 

ComfortCreator

Well-Known Member
The way to differentiate light burn from nute burn is easiest by looking where the burn is.

In this case it extends down to the lower leaves, and equally so. This cue tells us that although the light may or may not be too close, this issue is nutrient related. I would guess just a bit strong as someone else mentioned. I wouldnt change much. It looks fine and you dont smoke the leaves.

Assuming you are done within a few weeks i would glide path to the end and reduce feed by half or skip feeding a time or 2.
 

WarioSmokinWeed

New Member
The way to differentiate light burn from nute burn is easiest by looking where the burn is.

In this case it extends down to the lower leaves, and equally so. This cue tells us that although the light may or may not be too close, this issue is nutrient related. I would guess just a bit strong as someone else mentioned. I wouldnt change much. It looks fine and you dont smoke the leaves.

Assuming you are done within a few weeks i would glide path to the end and reduce feed by half or skip feeding a time or 2.
Makes sense...I was feeding 3/4 most of flower because when I'd feed my runoff ppm would come out at around 1200 which I thought was perfect and when I did regular waterings it would come out to 700 ppm runoff...however I noticed the ph was dipping again so I added some garden lime and I think that's when it started to look burned. Last feeding I did 1/2 strength, you think I should do less than that?
 

WarioSmokinWeed

New Member
Problem looks to be getting worse, when I watered this week it was supposed to be a feeding but because of the nute burn I gave it its regular water instead (distilled water w/ cal mag) tomorrow I'm gonna give it a weak nutrient mix because it'll be time to water, does this problem look bad or is the yellowing fan leaves normal towards the end of flower? Most of the bottom fan leaves are gone already.

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Killaki

Well-Known Member
Problem looks to be getting worse, when I watered this week it was supposed to be a feeding but because of the nute burn I gave it its regular water instead (distilled water w/ cal mag) tomorrow I'm gonna give it a weak nutrient mix because it'll be time to water, does this problem look bad or is the yellowing fan leaves normal towards the end of flower? Most of the bottom fan leaves are gone already.

View attachment 4837113
Is it possible for you to show the plant from another angle just to see exactly what the whole plant has going on? If you really do have nute burn or nut lockout you don't want to feed.
 

WarioSmokinWeed

New Member
Is it possible for you to show the plant from another angle just to see exactly what the whole plant has going on? If you really do have nute burn or nut lockout you don't want to feed.
Hope this pic is better...oddly enough even though most of the main fan leaves have died at the bottom, most of the lower growth looks less yellow than the upper growth shown in the first pic

20210225_200025.jpg
 

Killaki

Well-Known Member
Hope this pic is better...oddly enough even though most of the main fan leaves have died at the bottom, most of the lower growth looks less yellow than the upper growth shown in the first pic

View attachment 4837132
That plant is definitely burnt up. Looks like nutrient lockout fo shizzle. What's your watering like? Is it a schedule? Do you water to run off? Is your soil as dry as it looks? Did you follow the advice previous in this thread and flush? If so was it with or without nutes? What's your feeding schedule like?
 

WarioSmokinWeed

New Member
That plant is definitely burnt up. Looks like nutrient lockout fo shizzle. What's your watering like? Is it a schedule? Do you water to run off? Is your soil as dry as it looks? Did you follow the advice previous in this thread and flush? If so was it with or without nutes? What's your feeding schedule like?
Yeah, I figured it was. I water once every 4 days and I feed every other watering. My regular water is distilled water with some cal mag, and my nutrient mix was usually 3/4 strength Fox Farms trio. I did 1/2 gallon of water each time since it's in a 2 gal pot.

I do water until runoff so that I can test the soil ph and PPMs, I've kept my PPMs between 700-1200 throughout flower...I've also added garden lime a couple times and kept my ph in range (it's currently at 6.5). I did flush last watering but I didn't use a weak nute mix, I used my regular water and got a runoff ppm of 750.

The soil does feel a little dry right now but I am on schedule to water tomorrow and I do tend to let my soil dry out a lot within the 4 days in between waterings. I'm planning on giving a weak nutrient mix next time, is that a good idea? Should I flush it with that too?
 

Killaki

Well-Known Member
Yeah, I figured it was. I water once every 4 days and I feed every other watering. My regular water is distilled water with some cal mag, and my nutrient mix was usually 3/4 strength Fox Farms trio. I did 1/2 gallon of water each time since it's in a 2 gal pot.

I do water until runoff so that I can test the soil ph and PPMs, I've kept my PPMs between 700-1200 throughout flower...I've also added garden lime a couple times and kept my ph in range (it's currently at 6.5). I did flush last watering but I didn't use a weak nute mix, I used my regular water and got a runoff ppm of 750.

The soil does feel a little dry right now but I am on schedule to water tomorrow and I do tend to let my soil dry out a lot within the 4 days in between waterings. I'm planning on giving a weak nutrient mix next time, is that a good idea? Should I flush it with that too?
Nice. Seems like the pH and ppm is in order. If it were me I'd stick to plain water. My understanding of it autos usually like less nutes than other varieties. Do you usually feed full strength? You usually let it dry out a lot? Like bone dry?
 
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