yellowing leaves in flower

Virado

Member
Hello fellow growers

Im growing Mazaar from DP on 25L airpot (5 gallons) filled it with 1/4 organic humus and the rest 50/50 peat and perlite, adding just some dolomite lime to maintain the pH round 6-7 range.

Mars Hydro 250W lights on a 3x3 tent (1x1 meters) + some UVB 45 minutes total per day, on 15 minute intervals

I like erring on the lower side when it comes to nutes so i start reaaally low, and make my way up to 0,9 - 1,0 EC

I use GH three part nutrients + a very small amount of molasses (to feed the bacteria just enough to regulate naturally the pH) + some veloKelp up to the third week of flower.

Veg I use 1-1-1 parts micro-grow-bloom
Flower I use 1-2 parts micro-bloom (lucas formula which ends up giving 1-2-2 ratio of NPK) always maintaining the 0.9-1.0 Ec range

I always water with alot of runoff, like 50% of volume used, to avoid salt build-up. She is now drying up every two days.

They grow like beasts. on the 3rd week of flower I raised the concentration 25% giving a total of 1.25 Ec, give or take, which is pretty low still, which resulted on tiny burnt tips, so I flushed with half the concentration and returned to 1.0 Ec, just to be safe.

From the 4th week onwards she started to yellow some of the top leaves, mainly on the center of the plant, so I raised the lights a little bit to be safe. The yellowing is progressing to other leaves, mostly top ones. Doesnt seem to be interveinal chlorosis. I measured the runoff pH and its on the 6-7 range which seems pretty ideal for this soil / mineral combo.

Any help is apreciated! Il be attaching some images here. Note the yellowing leaves, the tiny burnt tips, and some leaves are with their margins slightly turned upwards. Not sure if its deficiency or excess. wish they were more on the lush green side up till flushing :/ the bottom leaves are more dark green.

Thanks!

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Virado

Member
Maybe i should leave the pot dry too much to avoid salt build up? I never let them dry too much to the point of drooping though

Another possibility is that its a deficiency, backed up by the fact that the pots are drying up pretty fast.

Also note the praying leaves!
 
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nomaninsf

Well-Known Member
Mine always get yellow tips like that once I start adding my PK booster towards the end. Are you adding a PK booster? If not, might want to think about giving them that extra boost before flushing.
 

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Virado

Member
thanks for the replies... it ended up being low eC afterall... i increased the tota eC by 25%, then by another 12,5%, going from 1,0 ec to 1,38. They loved it. Will start flushing in three days. Unfortunately this strain/pheno didnt produce huge buds.. more on the airy and foxtail side. I'll post pics.

i figured it was due to low ec, because the yellowing started and was strongest on the center of the plant, where the light is strongest, so i figured the increased lilght was making that part of the plant use more nutes, and yellow due to deficiency.
 

livinthadream

Well-Known Member
Hello fellow growers

Im growing Mazaar from DP on 25L airpot (5 gallons) filled it with 1/4 organic humus and the rest 50/50 peat and perlite, adding just some dolomite lime to maintain the pH round 6-7 range.

Mars Hydro 250W lights on a 3x3 tent (1x1 meters) + some UVB 45 minutes total per day, on 15 minute intervals

I like erring on the lower side when it comes to nutes so i start reaaally low, and make my way up to 0,9 - 1,0 EC

I use GH three part nutrients + a very small amount of molasses (to feed the bacteria just enough to regulate naturally the pH) + some veloKelp up to the third week of flower.

Veg I use 1-1-1 parts micro-grow-bloom
Flower I use 1-2 parts micro-bloom (lucas formula which ends up giving 1-2-2 ratio of NPK) always maintaining the 0.9-1.0 Ec range

I always water with alot of runoff, like 50% of volume used, to avoid salt build-up. She is now drying up every two days.

They grow like beasts. on the 3rd week of flower I raised the concentration 25% giving a total of 1.25 Ec, give or take, which is pretty low still, which resulted on tiny burnt tips, so I flushed with half the concentration and returned to 1.0 Ec, just to be safe.

From the 4th week onwards she started to yellow some of the top leaves, mainly on the center of the plant, so I raised the lights a little bit to be safe. The yellowing is progressing to other leaves, mostly top ones. Doesnt seem to be interveinal chlorosis. I measured the runoff pH and its on the 6-7 range which seems pretty ideal for this soil / mineral combo.

Any help is apreciated! Il be attaching some images here. Note the yellowing leaves, the tiny burnt tips, and some leaves are with their margins slightly turned upwards. Not sure if its deficiency or excess. wish they were more on the lush green side up till flushing :/ the bottom leaves are more dark green.

Thanks!

View attachment 5416281View attachment 5416282View attachment 5416283View attachment 5416284View attachment 5416285View attachment 5416286
Oh very beautiful plant!!!
 

Virado

Member
It ended up being alright! ended upping up the eC buy 50%! I think she wanted even more, but stayed on the safe side. Here are the pics I promised... The buds are on the foxtail and airy side, guess due to genetics. but the smell is really delicate kinda citrussy. Mazaar... Added a picture of my next girl already in training.. passion fruit by DP.

Cheers

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Delps8

Well-Known Member
From the 4th week onwards she started to yellow some of the top leaves, mainly on the center of the plant, so I raised the lights a little bit to be safe.
"My kid sprained his ankle so I took away lunch."

It looks like you've done a really good job lighting your grow. Those plants are nice and compact with lots of branches and a lot of small leaves. Those are all signs of a plant that's been well lighted. Congrats.

Per my tongue in cheek comment, the yellow coloration has nothing to do with light levels. Plants don't reach to too much light by turning yellow — well, if you fry them with an HPS lamp, yeh but LED's are very different.

You wrote - "margins turned upwards" - when leaves get excess light they may "canoe" or "taco" meaning that they curl the edges inward. In some of your photos, the leaves are elevated above horizontal and seem to be curling in a bit. That could mean that you're right on the cusp of excess light. If that's still the case, you might want to raise the light 1". That will drop PPFD by maybe 50µmol and, if they flatten back out, you've found the "light saturation point" for the plant. That will change as the plant grows but that means that your plant is "being all it can be" so you'll end up with a substantial yield.

Really nice plants!


One thing I'll add - I can't justify removing leaves "to let bud sites develop". That's a travesty, in my opinion. But, with all of that wonderful foliage, air flow is an issue so make sure you've got fans moving air through the canopy.

I've attached a photo of a really nice plant from a couple of years ago. Everything went great right up to two days before chop and it got bud rot. Yup, I had a fan underneath there but I couldn't get RH down low enough and had to toss the whole thing. :-(

In retrospect, I should have removed more leaves under the canopy and/or had more air flow.



IMG_0174.jpeg
 

Virado

Member
"My kid sprained his ankle so I took away lunch."

It looks like you've done a really good job lighting your grow. Those plants are nice and compact with lots of branches and a lot of small leaves. Those are all signs of a plant that's been well lighted. Congrats.
thank you for the rrepy!

Yeah. i figured raising the lights a bit would also be good because it would spread out more ppfd on the outer plant.

what a shame bud rot, eh?

next run I'll go for 32 tops, and really lollypop and trim alot to leave only main colas. Itll be an experiment. Maybe ill make a journal out of it ;)
 

Delps8

Well-Known Member
thank you for the rrepy!

Yeah. i figured raising the lights a bit would also be good because it would spread out more ppfd on the outer plant.

what a shame bud rot, eh?

next run I'll go for 32 tops, and really lollypop and trim alot to leave only main colas. Itll be an experiment. Maybe ill make a journal out of it ;)
As hang height increases, the PPFD map gets better but PPFD, overall, drops. Is that a TS series light?

"next run I'll go for 32 tops, and really lollypop and trim alot to leave only main colas. Itll be an experiment. Maybe ill make a journal out of it ;)"
Ouch! Leaves are vital for plant growth so the fewer the better.

In the photo that I posted, I didn't lollipop the plant. I believe that lollypopping reduces growth because growers remove leaves that are used by the plant. Leaves in the lower part of the canopy are used for transpiration and as sources of nutrients for the plant in the flowering stage so I try to leave on as many as I can.

You've got a lot of plant material in there but a light touch is better than hacking things off.
 

IL grow

Member
Maybe i should leave the pot dry too much to avoid salt build up? I never let them dry too much to the point of drooping though

Another possibility is that its a deficiency, backed up by the fact that the pots are drying up pretty fast.

Also note the praying leaves!
Those who have been growing have less water compared to overwatering, that is a lesson I learned from big Ed Rosenthal,, I learned off of him, this was in the '80s, don't people ever read any books anymore?
 
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