Here we go again Yellow Leaves (Mg? or what?)

synmaster · #1 11-20-2007, 11:50 PM

So i have been really lucky and this is my firtst problem to date with a grow. I thought i had a green thumb all this time!

so now i have an obvious problem. Plants were doing fine for a week then all of the sudden started to turn lime green from the tops. Now they look like this.

I had my PPM at 1000 and ph around 5.7-6.0

using Veg A+B from Advanced
Hygrozyme
Superthrive
Cal Mag
VoodoJuice

currently i have the 20gal res with just calmag, hygrozyme and superthrive, Ph 6.0 and ppm at 400, hoping to relieve the plants of their stress.

should i just run ph'd water alone? Is it my environment?

please help as this is starting to effect my moms as well.

thanks

DMG3528 · #2 11-21-2007, 11:07 AM

You are not the only one with this prob.
I am researching cures for this prob myself.
I hope everything goes well for you.
I am getting the yellow budsites, the leaf boarder cupping.
I figured it was a cold weather soil problem but you are using hydro.
WTF

kittysecrets4u · #3 11-21-2007, 11:28 AM

Back off the concentration of the nutrient solution just a touch, and the problem should disappear. Note that if the plants never get any worse then the plants are probably just fine. The high level of nutrients accumulates in the leaves and causes them to dry out and burn up. You must flush with clear, clean water immediately to allow the roots to recover, and prevent further damage. The find the cause of the high nutrient levels.

Also bring your ph down to about 5.5. Too high or too low a pH can lock up nutrients in the form of un-disolvable salts and compounds, some of which are actually toxic to your babies.

Be careful and not over-water your babies... don't supplement the plants diet by adding more fertilizers, throwing off the pH even more and locking up even more nutrients. This type of problem is seen more often in soil mixes, where inconsistent mixing of the medium's components leads to "hot" spots.

Remember during flowering calcium and phosphors are very important. Flush at least once a month!

Hope that helps...

Good Luck

synmaster · #4 11-21-2007, 12:42 PM

I am currently running a rinse, the change came when i started to add the additives. Everything was fine before at low 800 ppm with just A/B, hygrozyme and superthrive.

I am thinking i have to have some form of ph lockout, Zinc possibly?

Nothing seems to be getting worse at this point. Buts hard to tell. I am just not sure if i should just go back to the fert and superthrive mix for now, until they look better. Or just rinse with ph water for a few days

DMG3528 · #5 11-21-2007, 02:23 PM

Hey SYN,
Have you moved your lights recently?

synmaster · #6 11-22-2007, 12:29 AM

yes i moved the plants into a hydro hut and they under a t5 array now.

Before they were under two 40w FL tubes and 110w FL