Is this heat burn? Some Nute Def.?

[DevinsDad]

This issue just began, Only seeing this on the top 2 levels of her, All the bottom looks fine.

-Soil
-Born and kept around 90s during lights on.
-50% humidity day / 56% humidity night
-Iguana Bloom only
-12/12 HPS 6" from top(Does not burn hand length)
-No PH testers



Heres a look at the bottom of the leaf.



Same strain as last time, same conditions as well. This didn't happen last time.

 

[al70]

Heres something to look into DD,
Potassium Deficiency


Problem: Older leaves turn yellow then start getting dark, scorched lesions around the edges of the leaves. Plants may stretch and stems may become weak. The symptoms are very similar to an iron deficiency except the tips of the leaves curl as the edges burn and die. The last picture below has some more information about the potassium requirements of your marijuana plant.


Solution: Potassium isn't absorbed properly when there is too much calcium or nitrogen in the system. Check the pH of your water, and flush your whole system with water that contains half the normal amount of nutrients and see if your plant starts showing signs of improvemen

 

[DevinsDad]

Heres something to look into DD,

From Googling, I was leaning toward that, But I just wanted some reconfirmation, Awesome how fast you posted that. I gotta get me some damn PH water testers. I figured it cant be that important seeing how people grow outdoor and rains PH is likely unique depending where you live. At this point Its top priority.

What would you guys do? cut off burnt leaves entirely? Cut off burnt tips only? Leave them be?

I already intend on flushing for a week or two.

 

[al70]

ye DD snip off all the bad stuff n get some ph test strips online, they're cheap, dont buy from china, it'll take weeks for them to arrive, stripping the bad leaves off will only do her good, be lucky.

 

[al70]

ye DD snip off all the bad stuff n get some ph test strips online, they're cheap, dont buy from china, it'll take weeks for them to arrive, stripping the bad leaves off will only do her good, be lucky.

don't flush for two weeks, give em plain ph'd water every 2nd feed, goodluck

 

[RonSmooth]

90 is hot but its the radiant heat that causes most problems. IF the ambient temp is 90, the leaf surface is much hotter. Think of a blacktop on a hot summer day. An HPS at 6" from the tops is putting a lot of radiant heat out. I'd bet if you left your hand there for 12 hours, it would be more apparent.

If the problem is affecting the leaves closest to the light, I would think heat stress.

I would also think that "bloom" nutrients contain sufficient levels of P so I dont think it is a deficiency.

Where on the plant is the problem occurring? That will help determine what the issue is as different nutrients display deficiencies/toxicities in different areas on the plant.

 

[DevinsDad]

90 is hot but its the radiant heat that causes most problems. IF the ambient temp is 90, the leaf surface is much hotter. Think of a blacktop on a hot summer day. An HPS at 6" from the tops is putting a lot of radiant heat out. I'd bet if you left your hand there for 12 hours, it would be more apparent.

If the problem is affecting the leaves closest to the light, I would think heat stress.

I would also think that "bloom" nutrients contain sufficient levels of P so I dont think it is a deficiency.

Where on the plant is the problem occurring? That will help determine what the issue is as different nutrients display deficiencies/toxicities in different areas on the plant.

This also sounds like it could be the case. The P levels look defic in PIC 2 of the first set.

the other leaves have the burnt curled ends.

Sounds like I got a little P or PH level issue, as well as the ambient room temp deal. I didnt consider that, longest I kept my hand under the lamp was maybe 2-3 minutes.

Just gets me, I ran 1 bagseed. Shes done. curing now. This is the 1 clone i cut off of said curing bagseed. And conditions are 100% identical, same plant heights and stalk width at same day and everything


And when I say 90s. I mean from day of germ to day of harvest. I have not figured a good way to reduce the temp yet.from my studies and research its not stress if the plant was born and raised in them conditions. And besides this issue. Well....

 

[al70]

I would take Rons advice on board DD, the problem has gotta be sorted so start with the easy one and get a fan on em to try n control the temps around em n get the ph in order second, relax n take you're time, you'll get it sorted, goodluck.,,,,cut all the bad shit off at the stems.

 

[DevinsDad]

I would take Rons advice on board DD, the problem has gotta be sorted so start with the easy one and get a fan on em to try n control the temps around em n get the ph in order second, relax n take you're time, you'll get it sorted, goodluck.,,,,cut all the bad shit off at the stems.

it was not a complete temp issue, as temps outside went down, my room temps have gone down. Now im never above 90-92 F. That times what happened was a combo of things.

I eyed up my dose of Iguana Bloom and went heavy on it. Then I also over watered, And that week it was hotter than normal.

So I cut off only ones with dead parts. I cut off at the stalk at an angle. Any that had color change but not dying, I left alone. Now everythings normal looking.

 

[al70]

Glad ye got it sorted DD, goodluck.