plants yellowing in 2nd week of flower!!!

18x10x10, lights vented with intake/exhaust, fresh air intake 24hr. carbon filter exhaust 24 hr. temp 75 inside...80 outside...RH 44%...Co2 15 min every 3 hrs...fans off...feeding 1300 ppms 4x on 6, 10, 6, 10 min schd. ph at 5.8 RO water. airstones in the tank, water temp 67.7...what can cause them to yellow out all over the plant? need help...thank you!!!
p.s. 6' rockwool with hydroton...see pics..

You need Cal-Mag.
CAL-MAG Plus. A Nitrogen, calcium magnesium and iron supplement.

im using sensi-cal- connoseuir, roots excelurator, liqued karma, sugar daddy, pirahna, and sensizym? added a little nootri boost

im using sensi-cal- connoseuir, roots excelurator, liqued karma, sugar daddy, pirahna, and sensizym? added a little nootri boost

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You're confusing the problem by using too many "rocket fuels". You only need a good 2 or 3 part hydro nutrient to grow perfectly healthy plants. Try simplifying your grow next time. As for right now, you could change out your res with fresh nutes and no additives and give that a try. You won't see any improvement in the damaged leaves, but it should stop the problem from progressing.

highpsi said:

You're confusing the problem by using too many "rocket fuels". You only need a good 2 or 3 part hydro nutrient to grow perfectly healthy plants. Try simplifying your grow next time. As for right now, you could change out your res with fresh nutes and no additives and give that a try. You won't see any improvement in the damaged leaves, but it should stop the problem from progressing.

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Great advice. I also use Cal-Mag very good results.

Your not getting the most out of your Co2. Way to long before it comes on an. Here's a start for you
http://www.thegrowstore.com/infopages/co2.asp?parentid=12


Peace

wont the switch from sensi-cal to cal-mag be a problem for the plants?

really appreciate the advice guyz....but i really want to know what was the main cause...they were vegging pretty nice? i cant pinpoint on when and what caused them to go bad...

plants are getting too tall!!! whats the best remedy