Matthew A Mackenzie
Apr 9, 2019

PK Deficiency?


This one of my Northern Lights photo girls. She’s about 6 weeks old, I’m running the green planet MediOne 1 part nutrient kit and PHing my nutes and water to 6.5. She’s growing under True Northern Lighting 238w QB fixtures at a height of 24inches.


This plant has been slowly getting lighter in colour and has been developing these brown almost what look like rust spots. Any thoughts?

Admin BLG
Apr 9, 2019

[@Matthew A Mackenzie] what type of medium are you using my friend? I think it’s definitely a PH problem.

Matthew A Mackenzie
Apr 9, 2019Edited: Apr 9, 2019

I’m using Pro Mix Hp. Do you think i need to drop it down a bit?

Admin BLG
Apr 9, 2019

@Matthew A Mackenzie
Best thing to do would be PH correctly 6.3 to 6.5 is good and catch some run off and see what PH that comes out at.

Matthew A Mackenzie
Apr 9, 2019

@Admin BLG
gotcha. So what would you say is the best way to correctly PH. Do I need to wait longer when I add my ph up or down and then measure ph again? And in the event I am get a high ph of my run off, what would be my next step?

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