Not all grows are perfect...

[changeofpace2014]

I might be wrong but it looks like a potassium deficiency.

I double check my ph and it is 6.4 so it's fine

Temp in the "grow room" at 26.1C

HR at 45%

Soil is close to moist from what I see on my meter

Only 3 of my Kali China are having this issue the rest are just fine.

Tomorrow I will begin a flush on those 3 girls, no feeding for a few days.

If I recalled with the KC I had some issues also last year.

If needed I might feed them with my own homemade potassium made with banana peel.

The Potassium Deficiency really caused me trouble. I was in deep for the issue was resolved and it occurred in the late flowering stage... Now I have a little cheat sheet with a few of the yellowing causes.

 

[YYCannabis]

changeofpace2014 this is the one i use for quick reference.

 

[Farmbuck]

Next they gonna have a shot of organic banana powder for potassium.