Is this light burn ? Slight yellowing top of plant leafs | rep+

Kevin K

Kevin K

Well-Known Member
Hey Guys..

I don't know if it's really a problem, but I'm in veg with 4x CFL's (56w) as of now and the tops ( sides ) turning slightly yellowish so I'm wondering if I'm under watering (don't want to over water because i'm on MG) or heat stress or is it normal? A bit of slow grow atm ( but it's idea as side are growing and top is now, idono. ). I'm trying to keep the light as close as possible because I have only 3ft of space and I want a nice and bushy plant.

Good solid answer will as always be rep+

ak-47, 24-27*c (75-80f) light 3inches from top, only water.


Thank you. Here some pictures.




 

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intensive

Well-Known Member
looks like it might be the first stages of burnt edges, flush with ph'd ro/distilled water then give 1/4 strength feeding and give it a couple days to recover. new growth will be in better shape then the older growth.
 
Tahmi.Guhnn

Tahmi.Guhnn

Active Member
Kevin K said:
Hey Guys..

I don't know if it's really a problem, but I'm in veg with 4x CFL's (56w) as of now and the tops ( sides ) turning slightly yellowish so I'm wondering if I'm under watering (don't want to over water because i'm on MG) or heat stress or is it normal? A bit of slow grow atm ( but it's idea as side are growing and top is now, idono. ). I'm trying to keep the light as close as possible because I have only 3ft of space and I want a nice and bushy plant.

Good solid answer will as always be rep+

ak-47, 24-27*c (75-80f) light 3inches from top, only water.


Thank you. Here some pictures.
Click to expand...

doesn't look that much like heat burn. what are the temps at the top of your plant? put you hand palm down on the top of the plant if it makes your hand feel uncomfortable then its more likely heat burn. if it doesn't then its a nutrient problem. and thats a whole different story
 
woodsmaneh!

woodsmaneh!

Well-Known Member
It looks like the light on the right is too close.

 [FONT=&quot] Cannabis does not receive full sun from sunrise to sunset in its natural state. It is shaded or given reduced light levels because of adjacent plant material, cloudy conditions, rain, debris and dust collection on the leaf surface, twilight periods of early morning and late afternoon, and light intensity changes caused by a change in the seasons. Too much light mainly serves to bleach out and destroy chlorophyll as opposed to causing leaf cupping, but it often goes hand-in-hand with high heat for indoor grows.

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NoDrama

Well-Known Member
Doesn't look like light bleaching to me, you don't really have enough light to do that. You need a 600Watt + bulb in very close proximity to light bleach a plant. It actually looks like a Zinc deficiency to me. Which is characterized by new growth having a banded appearance and slower overall growth accompanied by the nodes not lengthening and the leaves bunching up. Too much Zinc will kill plants faster than roundup, so be careful.
 
G

gobbly

Well-Known Member
looks like a defficiency to me, I'd guess zinc too. never seen a burn like that at all... Here's some guides on it. Based on the position it's almost certainly an immobile nute.



















 
Tahmi.Guhnn

Tahmi.Guhnn

Active Member
gobbly said:
looks like a defficiency to me, I'd guess zinc too. never seen a burn like that at all... Here's some guides on it. Based on the position it's almost certainly an immobile nute.
Click to expand...
is that from an updated verion of Cervantes Bible or another book?
 
G

gobbly

Well-Known Member
It's from some grow guide I had found online. I haven't actually read the whole guide, so can't speak to how good it is, but I thought these pics were great :) They very well might be ripped from a book, the only grow books I've read for quite a long time are Mel Frank's...

http://www.govannom.org/mj/
 
woodsmaneh!

woodsmaneh!

Well-Known Member
OK so if it is food issues, flush with 25% nutrients and things should go back to normal in a few days. Treating for one element can have very bad results as mentioned above. The other thing is some elements get locked up because they need other elements to become mobile so treating for one thing can cause issues. Flushing with 25% will get everything moving again and back in balance.

That is from JS old book.

I bet if you move the plant to the left by 2" it will go away, I say this as if I look at your picture the top and one side show the yellowing the other side does not? It is typical for all leafs on a node to show the same effects. IMHO
 
Kevin K

Kevin K

Well-Known Member
Let me clarify.

1) I put my hand at the top and I can feel the cool air from the fans.
2) I have MG ( miracle grow ) I can't flush, i can't feed, its full of nutrients already.
2) I don't think it's a " N " insufficiency problem as it's saying " the lower leaves " mine are the top leaves.
2) It's only 1 ( one ) plant.
3) Could it be transplant stress? I transparent about 3-4 days ago?
4) I put a thermometer at the top for a 10 minutes and I'm getting about 80*F so?
5) If it was nute lock out etc. would all leave go like that? It's only the new T O P leafs that are turning yelowish but still growing SLOWLY
6) I don't know if it's got anything to do with it but these light are ( warm white ) light. It was growing great before before the transplant.


Please help, one person is saying this other is saying that. More pictures maybe explain it.


 

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Kevin K

Kevin K

Well-Known Member
Well I was reading on a different forum that the guy had the same problem, he transplanted from MG to MG ( bigger container ) and waters the new plant. Now he went from a small cup to a big container, after he waters he activated a lot of the ferts in MG so no matter where the plants puts its roots, its faced with to much nutes. So basicly if the plants is strong enough it will survive. He said he waited it out and about a week later it was fine. Also know as over watering. I'm beginning to pick up why the pro grower really don't like MG.

AFTER TRANSPLANT WATER CAREFULLY PEOPLE.

thank you for all the feedback rep+ all of you.
 
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