Flowering 56 days, trim leaves turning white? pics included

[the_shadow]

I recently lost 2 plants to root rot, and I'm hoping this one isn't infected. (Using h202, hydroguard, and ice bottles now). This plant is budding pretty good, but I was hoping to go another 30 days. Does it look end of life? Why would only the cola trim leaves turn white?

What STRAIN are you growing? Unknown
What was the establishing technique? (Were the seed or clone?) clones
What is the age of your plants? 92 days (56 of flower)
What Technique are you using? DWC
What substrate/medium are you using? Hydroton
What is the Nutrient temperature? 65F
What Nutrient's are you using? GH 3 part series
What is the TDS/EC/PPM you are using? 950
What is the pH of the "Tank"? 5.8-6.2
Are you sure your calibration is correct on your equiptment? yes
When was your last watering? yesterday
When was your last feeding change? 3 weeks
What size bulb are you using? 400W HPS
What is the distance to the canopy? 18 inches
What is your RH Factor? 0
What is the Day/Night Temp? day is 50-80, night is 30-60
What is the current Air Flow? open door, open window with box fan
Is the fan blowing directly at plants? one recirculating fan is
Is your water HARD or SOFT? hard
Has plant been recently pruned, cloned off of or pinched? no
Have any pest chemicals been used? h202 for root rot
Are plant's infected with pest's? no

side view

one of the top colas

another view

 

[Kabong]

if its only happening on the top id suggest you look into the lights 18 inch distance from the top of that roller coaster of a canopy, could be one of those deficiency's i cant remember that is clearly illustrated in stitchs sticky, a pretty good guide at the top of the Infirmary's thread list, in the sticky section.

 

[stihgnobevoli]

heat sttress/light burn move the plants or the lights farther apart.

 

[VenturaHwy]

Is it just some buds or all of them? Closest to the light buds?
Burnt tips are always the roots to me - if you are giving them oxygen through air stones maybe it is not enough. . . more O2

Day/Night Temp? day is 50-80, night is 30-60 - sounds like Alaska, make it more like Hawaii, 77 to 83 and 72 to 77.

 

[the_shadow]

stihgnobevoli - I adjusted the lights this morning. They are now 22 inches from the top cola. The weird thing is, I have one cola about 6 inches above the main canopy, which exhibits the weird coloration. I have another cola about 6 inches above, that looks completely healthy???

VenturaHyw - It's just some buds. some higher, some lower. Very sporadic. The burnt tips occured about 2 months ago. I adjusted ppms to 1050, noticed the burnt tips, and flushed. have kept them at 950 since then. The new coloration starts from multiple places (interior of leaf, side of a leaf finger, etc.. not really from the tips though)

Day/Night temps are crazy... I live at 5000' elevation in the rockys, and I have to let it cool at night otherwise the day temps will skyrocket. Since yesterday I've been using multiple frozen water bottles, and the nute/water solution has been 60-62F. Hopefully that will make it harder for root rot to set in.

I'll try to get more 02 in there... unfortunately with them being scrogged, I have no way to get to the interior of the bucket. Maybe just hang some airstones down the sides?

Thanks for the help all, any other suggestions I'm all ears!

 

[the_shadow]

well, the weird coloration is no longer spreading... however, bud growth isn't that great either.

Suggestions are appreciated!

 

[durtymyk]

22inches makes your 400watt insufficient...

22inches makes your 400watt insufficient...

chk the chart on the post a couple above mine....that wud make the growth of you buds to not be where it cud or shud be...