Top leaves are discoloring

[autowidow]

My 2 Polarlights are turning light green at the top leaves. My Blackstar 500 is 10"and 12" above them. They are 47 days old.

 

[THCRx]

Most likely an Immobile element... maybe sulfur. Have you looked at plant problem guides? Great guide here - https://www.autoflower.org/f34/announcements.html

 

[autowidow]

You are probably right THC. I noticed some leaf clawing and cut back on my base nutrients, so the micro nutrients might be lacking. Thanks for the input.

 

[AutoflowerLover]

same thing happens to me right now, did you solve your problem? how?

 

[autowidow]

Autoflower, I am feeding today, I will update in a couple of days. I did move my light about 3" higher.

 

[Scott817]

it looks like a cal/mag deficientcy with the lights being to close. You could try to mix up a cal/mag foiliar feed at ph5.5 and keep your lights 14"-16". I get this problem with my GLH spectra 290w led as well if the lights get to close.

 

[autowidow]

it looks like a cal/mag deficientcy with the lights being to close. You could try to mix up a cal/mag foiliar feed at ph5.5 and keep your lights 14"-16". I get this problem with my GLH spectra 290w led as well if the lights get to close.

Right on thank you Scott.