4 plants two yellowed fast two did't

[chitownhigh]

I am on my second grow and I have no idea why two of my four plants yellowed early... starting from the bottom up. I am using cfl 150 and cfl 200W bulds with a few 100 w cfl to suppliment light on lower limbs. I am using Fox Farm/Ocean forest 50/50 mix. using nutes big grow...big bloom.. and tiger bloom. All plants have been fed the same so it is not nute burn or deficiency as i can tell. the first two plants were started in 1-1/2 gallon (pics below)the second two were in a 3 gallon square pot and an airpot (pics below) one of the 1 1/2 gallons germinated in root riot grew huge but yellowed soon into flowering... it had nice buds but very pale ones and they smell musty and grassy now that they are dry. the second grow were both germinated in root riot, the one in the 3 gallon pot is beautiful green, while the airpot is yellowing from bottom up...

Any help I can get with this would be great!

 

[Muddy]

The yellowing and up curl of the leaves seems to indicate a P deficiency. My guess would be a pH lockout causing the deficiency. Do you know what the pH is?

 

[JM]

yup... thats what I'd say too...

 

[chitownhigh]

reads around 7.2 lower the PH? ill try it didnt think that was it because both plants read the same PH the one that yellowed and the green one

 

[Muddy]

That's the problem. Get it down to between 6.3 - 6.5. Above 7.2 P is locked out. Are those plants two different strains?

 

[chitownhigh]

no both chronic ryder... used ph down on it last night will lower slowly again in next watering

 

[chitownhigh]

Update: have slowly lowerd PH down to about 6.5 over the last week... there is little or no change in yellowing i am not sure if yellowing will disapear or new growth wont yellow. It doesnt seem to be PH ...plus my other plant has ph of around 7.5 and it looks green and healthy. this happened on my last grow too...one plant yellowed at start of flowering and had pale green buds...the smoke is good but it never got huge like the non yellowing plant.... i am stumped!

 

[Trifid]

Your plants are damn good you're clearly no novice Chitown..

Please continue to update us.. I will be following along for sure. + rep

 

[chitownhigh]

update: i had thought it was mag deficiency so i added epson salts to the last 2 waterings and nothing has helped?