Revised: The Complete Guide To Sick Plants,pH and Pest Troubles - PlanetGanja.com

This link has a lot of great info.

Good luck.
Weedhound Reviewed by Weedhound on . Northern Lights 24 days into flowering and leaves yellowing Hi Folks Well, we have nearly made it on our first grow and we have two female Northern Lights plants that are about 3 and a half feet in height. Some basic info on our grow: Using a 250 W fluorescent light Growing in a general purpose garden compost from B&Q Feeding using a chem fertiliser - B&Q general puirpose plant food which has a NPK ration of 5-5-5 and contains trace minerals Have used organic bonemeal to supplement Ph levels Watering using boiled tap water Lights on a 12:12 Rating: 5