Yellowing sugar leaves

throbster · Mar 9, 2016

I am currently on day 64 of flower.
Growing in coco under Cob Led light. Strain: Sour Diesel.

Have had yellowing of sugar leaves for a while. It has happened my last 2 crops.

Do you think it is over fertilization/ too much nutes or too little/ nute deficiency, both of which have been suggested. Or any other suggestions?

TrimothyLeary · Mar 9, 2016

Maybe copper deficiency/lockout. Check pH and if good, maybe raise your lights a bit?

I'm thinking high pH locking out copper. You've probably cut nutes by now yeah?

superbak3d · Mar 9, 2016

Too much PK

They look ready to chop anyways. They look great though otherwise

TrimothyLeary · Mar 9, 2016

Doesn't look like P, could maybe be K. I still say copper lockout from high pH, maybe because he quit feeding nutes, but was used to the pH dropping with the nutes. Pure assumption, but it looks just like copper deficiency.

Agreed though, you're damn close to chop if not already there.

throbster · Mar 10, 2016

I've been keeping PH around 5.8-6.0 throughout.

superbak3d said:
Too much PK

They look ready to chop anyways. They look great though otherwise

Yes. I think this may be it...
Do you have any more insight on the correct use/dosage of PK? I've just been following directions on the bottle. (Using for just one full week)

Yellowing sugar leaves

throbster

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