Browning between leafs veins and slight yellowing, pics included

[AndreNicky]

This morning when i checked on my plants i noticed this odd browning that seems to be effecting about half my plants, looks like a calcium deficency but don't really see how thats possible(maybe calcium lockout or overfed?).

I'm currently feeding all plants with 3ml micro/4.5ml bloom/ 2ml Cal-mag plus mixd with about 1 gallon of 25% tap/75% RO, the plants are in uncut botinacare cocogro coco-coir.

Can't be a ph problem because i use 2 different test kits(aquarium and GH kit) and they both tell me the ph is just about 5.9.

Here's a few pictures of the plant most effected, the major yellowing is from my HPS i'll try to snap some pictures later when lights go out.

The main spots effected are middle/top of plants(not very top) but some plants have rust spots on there bottom leaves aswell.

The hps glow really makes it hard to see the yellowing so i'll get another picture in acouple hours when lights are off

 

[Weedhound]

Are those leaves really as yellow as they look in the photos or is that your lighting?

 

[Weedhound]

Christ i'm off the game today. You said in your post it was the lights. Can you fill out Stitch's troubleshooting form?

 

[AndreNicky]

How long has this problem been going on? about a day
Are you growing in a PVC grow tent? Homebox
What STRAIN are you growing?Biko and mazar-i-sharif
What was the establishing technique? Seed/clone
What is the age of your plants? about 4 weeks
How long have they been in there mixture they are in now? about 3 weeks
How tall are the plants? Ranging from about 3-7in
What PHASE are the plants in? Seedling/veg
What color are your roots? White? Brown? Are your roots slimy? White, no
What Nutrient's are you using? GH Bloom/micro
How much of each nutrient are you using with how much water?2.5MLmicro/4.5MLbloom/2MLcalmag-plus
How often are you feeding? Every otherday
How often are you giving nutrients? Everytime i feed
What order are you mixing your nutrients? Micro then bloom
What is the TDS/EC/PPM you are using? dunno
What is the pH of the "Tank"? 5.8-6.0
Are you sure your calibration is correct on your equiptment? Yes
When was your last watering? yesterday
What is your water temps? 65ish
When was your last feeding change? yesterday
How often do you clean your system: example: Flush out water replace with clean water and nutrients? Never
What size bulb are you using? 400w hps
What is the distance to the canopy? about 12 in
What is your RH Factor(Relative Humidity)? 30-45%
What is the canopy temperature? 70-80, My digital thermometer tells me around 80 usually and the old school glass tube one tells me 70-75 usually. think the digi ones broke
What is the Day/Night Temp? 70-78day/55-65night
What is the current Air Flow? (cfm etc.) 171cfm
Tell us about your ventilation, intake exhaust and when its running and not running ? Vent fan runs whenever lights on(20/4 atm)
Is the fan blowing directly at plants? Yes
Is your water HARD or SOFT? dunno
What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water? 25% tap/75% RO
Are you using water from a water softener?No
Has plant been recently pruned, cloned off of or pinched? Yes
Have any pest chemicals been used? If so, What and When? No
Are plant's infected with pest's? No

Here ya go

 

[Weedhound]

They look light bleached to me but thats just a guess. It would be my very FIRST guess though with all the lighter looking leaves are on the top.....closest to the light.

Some other thoughts: Make sure your ph meter is calibrated, pull your lights back somewhat and flush and renew your nutes. These are all part of NORMAL maintenance of hydro and should be done once a week to no MORE than every 10 days.

Also, 65 water temp is getting a bit low. A good cheap aquarium heater will fix that issue for you......70 being a good number to aim for.

But I really think it's light bleaching just from the pictures themselves.

 

[AndreNicky]

I thought the same thing weedhound, thats why i recently put the light alittle higher (whent from about 8" to 12"). The yellowing isn't really concerning me too much tho, more worried about the browning . Probally gonna give them a good flushing tonight and then a normal feeding tommorow, hopefully that clears things up

 

[Weedhound]

Well if they are light bleached and starting to brown that's the next step as the plant dies off. It may be different stages of the same issue as well......but I don't know that; just guessing.

A good flush and fresh nutes seems like a good next step. Good luck.

PS....check your roots.........carefully. Unhappy roots =unhappy plant.

 

[AndreNicky]

spaced out and forgot to post these pics earlier (too much ATF ),

The browning has gotten slighty worse since then but it doesn't look like its spreading, hopefully a good flush helps

 

[Jim Dunlop]

The leaves are turning purple because of your room temps...

You said it was in the 50's at night, well... there ya go!

 

[AndreNicky]

My leaves arn't turning purple and the room only gets down to 50 when its really cold outside, been pretty good as far as weather go's latley.

 

[stihgnobevoli]

low ph causing lockout.

 

[AndreNicky]

No way it can be low PH, is there a reason why u think that stihg? I did give them a feeding of 5.0ish water about a week ago by accident but since then i've fed with a more normal PH\

Edit: wanted to add the reason it can't be a ph problem is because half my plants seem to be unsffected by this issue and there all fed from the same jug

 

[stihgnobevoli]

What is the pH of the "Tank"? 5.8-6.0

this isnt a hydro grow correct? why is your ph so low? is it supposed to be this low when you use coco? i dont know you tell me. i was under the impression that when you grow in soil or soiless medium your ph should be at least 6.5

 

[AndreNicky]

Coco is considered hydroponic, i guess if u mix it with additives it might be more like a soil mix but pure coco is meant to be treated like a hydro grow. So 5.8-6.0 should be just about perfect as far as ph go's