gkawall

so, it was some of N deficiency, when i put them into flowering, they yellowed a lot! because, i stopped to feed them with hi nitro nutes, its quite normal they get yellow because they are using the power rested in the leaves to turn the grow into buds... buy the way can you send me the details of your grow ,like time temperature, humidity what nutes are u using or what stage of grow they are?
just feed them with 1/3 of hi nitro for 2 or 3 times, and they should be fine

hey man if you come up with a solution to your yellowing leaves let me know. My plants are doing the same thing. Although i think it might be pH but don't hold me to it..