Yellowing top leaves - help

[dvchava]

Problem: Yellowing top leaves.
Medium: Soil - biobizz light mix
Feed: Advanced nutrients - Sensi Bloom a+b, AN Cal/mag
Strain: Auto Blackberry Kush - Dutch Passion
Climate: Temp - Max: 29ºc Min: 22ºc
Additional info: Yellowing top leaves on BOTH plants. The part of the plants that get more light appear to be more affected.
The lower leaves seem to be healthy, very green. The light is a SunMaster 250W.

 

[Fantasy Island]

How much are you feeding them? Have you checked your soils Ph?

 

[dvchava]

How much are you feeding them? Have you checked your soils Ph?

No, I haven't.
I was feeding them 2ml per L of Sensi-Bloom a&b. The last time I feed them was 1ml per L of AN Cal/Mag.

 

[Fantasy Island]

Well the feed seems to be enough that along with the AN cal mag that has N in it.

I am not a expert I was really just bumping your post to get one and they would want to know them questions.

What I read is nitrogen deficiency and Ph lockout

What size and kind of pots are you using? does the soil stink?

And I assume your nutes are Ph perfect but that doesn't mean that your soil is in the right range.

While you wait, have you checked out www.growweedeasy.com? They have a nice big section of ailments that might help you.

Remember I am no expert and one should be along shortly.

Good luck

 

[dvchava]

Well the feed seems to be enough that along with the AN cal mag that has N in it.

I am not a expert I was really just bumping your post to get one and they would want to know them questions.

What I read is nitrogen deficiency and Ph lockout

What size and kind of pots are you using? does the soil stink?

And I assume your nutes are Ph perfect but that doesn't mean that your soil is in the right range.

While you wait, have you checked out www.growweedeasy.com? They have a nice big section of ailments that might help you.

Remember I am no expert and one should be along shortly.

Good luck

Thanks for the advise
They are in 10L airpots. Hi feed water-nutrients-water.
What are my options now? Flush?

 

[Fantasy Island]

I am not in a position to tell you what to do. I am to new myself. Let me try and help this way

Please help this guy @Renaissance Redneck @Waira @The Elvis @namvet25 @pop22 @blue @TaNg @Margahooja

 

[pop22]

Looks like a sulphur deficiency, the signs of which are yellowing from the top down. N deficiency is yellowing from the bottom up.

Problem: Yellowing top leaves.
Medium: Soil - biobizz light mix
Feed: Advanced nutrients - Sensi Bloom a+b, AN Cal/mag
Strain: Auto Blackberry Kush - Dutch Passion
Climate: Temp - Max: 29ºc Min: 22ºc
Additional info: Yellowing top leaves on BOTH plants. The part of the plants that get more light appear to be more affected.
The lower leaves seem to be healthy, very green. The light is a SunMaster 250W.
View attachment 501186 View attachment 501189 View attachment 501190

 

[Waira]

:smoking:-- I'm leaning Pop's way on this too, this color fade pattern smacks of S defc.,...much of the plant can go pale, but tops are worst,.. S is an immobile nute element, so newest growth will suffer first... ( this means the plant can't remove it from other older established parts of the plant, mainly fan leaves, and send it up to where it's needed most--new growth).... temps are a bit high at 29C,...what's thr RH? ... and we for sure need a soil pH, just to make sure there's no lockout happening here,... best, fastest source of S is epsoms salts (MgSO4),... for defc. treatment, 1tsp/qt, for 2-3 rounds, and/or even better and fastest of all, a foliar spray at half that dosage... this needs to be done right though, to be effective... if you want to try, let us know and we'll tell you how,...a water spreader/wetting agent is critical to this, readily available at grow shops...

 

[dvchava]

:smoking:-- I'm leaning Pop's way on this too, this color fade pattern smacks of S defc.,...much of the plant can go pale, but tops are worst,.. S is an immobile nute element, so newest growth will suffer first... ( this means the plant can't remove it from other older established parts of the plant, mainly fan leaves, and send it up to where it's needed most--new growth).... temps are a bit high at 29C,...what's thr RH? ... and we for sure need a soil pH, just to make sure there's no lockout happening here,... best, fastest source of S is epsoms salts (MgSO4),... for defc. treatment, 1tsp/qt, for 2-3 rounds, and/or even better and fastest of all, a foliar spray at half that dosage... this needs to be done right though, to be effective... if you want to try, let us know and we'll tell you how,...a water spreader/wetting agent is critical to this, readily available at grow shops...

Hello and thanks for the attention.
Hi will buy epson salts after tomorrow. Is there anything I can do to slow the situation?
I have read that too much calcium can cause lock out to sulphur...

 

[Waira]

...don't worry about the Ca inputs, no way there's that much in there,...look at your nutrients ingredients, and see if there's any source of S in there,... a very good supplement to have is some sort of micronutrient booster as well,... it'll have various metals like Fe, Zn, Cu, Mn, others like B, S, Mo,... it varies brand to brand, so always--read those labels!