Help PLEASE! Look at this leaves :(

Fifth week of flowering. Mostly big fan leaves turn like this please help what does it need?
http://i1203.photobucket.com/albums/bb396/Huynhh87/138e67b5.jpg

Fyi: just started organic worm casting fertz last week on these plants.
Thank u in advance.!.!

From what I've read around, not 100% sure on this, it uses some of the nutrients from lower fan leaves to "Grow" bigger buds? So the fan leaves dry up & fall off.
1st post woohoo

Looks like a phosphorus deficiency to me.

evilpyro26 said:

Looks like a phosphorus deficiency to me.

Click to expand...

yeah could be. Looks like it.
View attachment 1540069

itzjesus said:

From what I've read around, not 100% sure on this, it uses some of the nutrients from lower fan leaves to "Grow" bigger buds? So the fan leaves dry up & fall off.
1st post woohoo

Click to expand...

No leaves should fall off. yellowing towards the end of flower is fine, but not yellow and fall of