Hope somebody can clear this up for me. I am almost 100% that I have nutrient lockout and that it is being caused by a ph problem.

Sorry I don't have any pics to show, but from what I've seen and read, I am sure it is a nutrient lockout. I have 8 plants. 3 of them have burnt tips and edges and turning yellow. 2 of them show an Iron deficiency, and the other 3 look very healthy. The medium I am using is Promix. I water with regular tap water, the ph on the tap water is 7.2 to 7.3. This is where I am confused. When I do a ph on the runoff of the plants, the ph is anywhere from 6.3 to 6.9. I have read that Promix is a soiless medium. And other places say to treat it as 'soil'. If it is a soiless medium, then am I correct in assuming that I should be keeping the ph between 5.5 and 6.0?? Or is that the current ph level, correct?? I'm thinking that my problem is that the ph is too high, and therefore that is causing my potassium and Iron problems due to it being locked out. According the readings, potassium will get locked out on "soiless" mediums when the ph is over 6.0.

So what I am asking is, first, is Promix deemed at "soiless soil"??

And if so, then am I correct in assuming that my problems are due to my ph being too high??

If I am assuming correctly, then I should flush thoroughly the affected plants, correct?? And then after flushing, I should use some ph down in my water to bring it down to between 5.5 and 6.0. Correct??

Please, I've done lots of reading and I hope that I have figured this out. Please help.

Thank you
faceto27 Reviewed by faceto27 on . Need help with nutrient lockout Hope somebody can clear this up for me. I am almost 100% that I have nutrient lockout and that it is being caused by a ph problem. Sorry I don't have any pics to show, but from what I've seen and read, I am sure it is a nutrient lockout. I have 8 plants. 3 of them have burnt tips and edges and turning yellow. 2 of them show an Iron deficiency, and the other 3 look very healthy. The medium I am using is Promix. I water with regular tap water, the ph on the tap water is 7.2 to 7.3. This Rating: 5