Leaves turning yellow, Please help!!

[morrisgreenberg]

ok if thats what it is, most likely its that, very common, you can go full strength cal/mag 10mg/gal...this may not get your older leaves back to being dark green but this will hold off the yellowing until harvest, but with RO water you should use the cal supplement at all times even at half strength, this goes for your clones and baby plantlings aswell...so keep in mind when ever you want plain water add calmag even on top offs.i have been blessed with good tap water 40ppm and i have great success when adding calmag up to 250ppm for rooting new cuttings, with the supplements clones wont go yellow

 

[drewbear]

Gotta go with SmokeyMcPopkinZ>>>> my first thought was nute lock.

When not sure DO NOT raise your nutes. First time on the site and the fool said that is already on my ignore their advice list.
When your not sure what's up DO NOT RAISE YOUR NUTES

Pour warm water through the plant pots. Hot water disolves salt better, but plants will burn, so.... as warm as a plant can take it. Do it... NOW. Do it OFTEN (for 4-5 days.)
If nute lock is not your problem there is no hrm done by just water for 5 days

Usually the cause is this.... remember when they were still small and tiny and still basically clones?? Those first few days in the system when usually they are hand fed is enough to cause nute lock in the rooting medium. (rockwool?) Also your sprayers in those first few days could actually wet the medium you cloned in but the plant gets the nutes directly from the mist so the nutes in your medium just sit and build up.

Which is why you want to flush those little netted pots your plants are in. Yes it is 5:30 am est. you want to save those plants then go flush them.
How will you know if it worked? The plants will just start to grow again and no MORE yellow leaves. The ones already yellow? Will just drop quicker, same as other fan leaves

 

[RobMar]

ok if thats what it is, most likely its that, very common, you can go full strength cal/mag 10mg/gal...this may not get your older leaves back to being dark green but this will hold off the yellowing until harvest, but with RO water you should use the cal supplement at all times even at half strength, this goes for your clones and baby plantlings aswell...so keep in mind when ever you want plain water add calmag even on top offs.i have been blessed with good tap water 40ppm and i have great success when adding calmag up to 250ppm for rooting new cuttings, with the supplements clones wont go yellow

Unfortunately the water where I am is crap 700 ppms right out of the tap. Thanks for the help. I really appreciate it.