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is it normal to have the leaves towards the top around forming colas go pale that early? In a satvia ominated plant (ak47). Using highgrades GH bloom formula.
Do you need to add Mg when using about 140 ppm tap water? Will the tops being too close to a 1k hps cause overall yellowing at the tops?
Thanks...
Can you fill out the troubleshooitng form and hopefully get pics too?
There could be a couple different explanations. Some aren't so great...
If you are using the GH 3 part the correct way, you should have plenty of Mg. Yellow tops isn't Mg def anyway- it CAN be an iron lockout.
Form is at the top of the 'problems' section. Answer as muhc as you can.
Stinky is right, but you are just bleaching them with the light. Move them down or go to 600W.