Yellowing in flower

[IndicaIVoz]

I had yellowing leaves and/or what looked like a CalMag deficiency.
Turned out it was Nitrogen TOXICITY, that was causing a Cal/Mag lockout.

My ignorance and naivety was compounding the problem, because the CalMag supplement I was adding, was high in Nitrogen.
I suspect there was also a pH issue underlying the problem too.
The upper leaves, which didn't show the yellowing or mottling were a deep, deep darker green.

Not saying this is your issue - but might be food for thought?

Yeah so common. same with Ph and lockouts its almost always Ph and"N tox cal lock" hey that rhymes ,its funny because in hydro in particular ,people go through whole lists of things which are in fact happening ,however only due to the above issues.i see it again and again.

 

[IndicaIVoz]

And no thats neither mag or cal lockout ,to me that appears to be under-nuted maybe from Ph lock or something.

 

[MrAmnesia]

Shes been getting 1ml calmag ler litre for the last 3 weeks

 

[derek420colorado]

Shes been getting 1ml calmag ler litre for the last 3 weeks

not a calmag issue

 

[IndicaIVoz]

Flush your pots with 3 times the volume of the pot with pH'd water only then on the last volume of water add half strength nutes. this should get everything back in order and it is a good idea to always pH your water. Always adjust pH AFTER adding your nutes.

Yup deffo Ph issue note the necrosis on the yellow leaves.

 

[Yozhik]

note: the leaves that are yellow are not going to turn back green

Yep.

Defoliate them.
Right now, they're just parasitic energy suckers.
Get rid of them.

 

[oldcoot]

I dont think its cal mag either.
If its close to harvest. I wouldnt worry to much if your going to run just water in like a week.
But i would do a good flush like derek suggested .

 

[MrAmnesia]

Think its got 3-4 weeks left , shall i pull all the yellow off?

 

[derek420colorado]

Think its got 3-4 weeks left , shall i pull all the yellow off?

yeah

 

[oldcoot]

You can.