Sick plant need help

[Original smokey]

I have a fem cheese plan just started the 4th week of flowing. Useing foxfarm nutrients r/o water in a 5 gallon dwc. tips of my leaves are turning crispy brown and fading yellow. I check the ph daily. I have to adjust the ph daily it drops from 6.0 to 5.0 at the least daily.

 

[stinkyattic]

Adding your mineral supplement (typically calmag) will help stabilize the ph. Why are you using RO, is your tap water very soft? And do you have a way to confirm you're at the right total ppm when all is said and done?
Also, how often to you do a full reservoir change, and do you have adequate oxygenation to the root zone?

 

[The Hemp Goddess]

Brown tips can mean nute burn. What ppm are you running? What Fox Farm products are you using (they have lots of different products)?

 

[Original smokey]

I am running r/o water because im on a well. I do use calmag. My p.h is at 6.0 after my nutrients. I change my res every 10 days to 14 days. I flushed my plants for 3 days and still getting brown tips and Yellowing.

 

[Original smokey]

I am useing fox farm dirty dozen. At half strenth

 

[stinkyattic]

I am useing fox farm dirty dozen. At half strenth

Without knowing your total ppm in the solution after everything is in there, you're kinda running blind.
Also with that burnt tip/pale leaf combo, I'm thinking your plants are using up fertilizer components unevenly and for the size of that plant vs the size of the res, you should consider weekly res changes.
But definitely get a TDS meter! It will help troubleshoot

 

[Original smokey]

I apoligize my ppm is at 360

 

[stinkyattic]

Oh that is lowwww.

 

[Original smokey]

I know but i had it higher and it seemed to burn it. I have flushed it and still same thing

 

[Original smokey]

Ok thank you

 

[longtimegrower]

I know you probally done but try reading this. . https://www.mandalaseeds.com/Guides/Fertilizing-Smart-Guide

 

[Theeyebt]

i have the identic problem like you wellow leavs ... i think is phosphorus deficincy today i will flush againg the ph6.4 whater unthil calmag that i order will come in the new wather i will add just hesi phosphorus

 

[St_Nick]

Try setting your ph at around 6.5 and let it sit and stabalize before you add the calmag. I am happy when I start seeing just the tips curling near the end of flower. Means the plants are getting a tad more then they can handle and its time to start the flush.