Problem with my girls, HELP !

[voxberry]

Hello people ...
I have a problem with almost all my plants .
The leafs are turning yellow with the center green .
It's starting from the bottom and goes up slowly ... sorry for my "great" english.

I will try to let the pictures talk for me :

 

[voxberry]

some more pics

some more pics

and some more pics with this problem

 

[voxberry]

details

details

How long has this problem been going on? 10 days
What STRAIN are you growing? Church
What was the establishing technique? (seed or clone?) CLONES
What is the age of your plants? 28 days
How long have they been in the soil mixture they are in now? 3 weeks
How Tall are the plants? 16 inches
What PHASE (seedling, vegetative or flower) are the plants in? veg
What Technique are you using? (SOG, SCROG etc) none
What size pots are you using? (Include how many subjects to pot) 8 L + 12 L Pots
What substrate/medium are you using? What brand of soil mixture are you using?(percentage of perlite, vermiculite...etc?) Rich soil mixture.
What Nutrient's are you using? Vegetative nut. NPK 6 2 3
How much of each nutrient are you using with how much water? *Knowing the brand is very helpful* just a little until today
How often are you feeding? Tap water . once every 2 days
If flowering, when did you switch over to using Bloom nutrients?
What order are you mixing your nutrients? (example: veg nutes 1st, bloom 2nd ect) N/A
What is the TDS/EC/PPM of your nutrients used? N/A
What is the pH of the "RUN-OFF"? around 6.1
What method of pH test was administered? Using Strips? pH pen? PH PEN
How often are you watering? Every 2 days
When was your last feeding and how often are you feeding? twice, every 6 days
What size bulb are you using? 400w MH + 200 W white floro's
What is the distance to the canopy? 12 inches
What is your RH Factor? (Relative Humidity) N/A
What is the canopy temperature? 28 - 33 C
What is the Day/Night Temp? (Include fluctuation range) 30-32 C during lights ON - 26-28 during lights OFF (I turn off the MH for 8 hours)
What is the current Air Flow? (cfm etc.) donno
Tell us about your ventilation, intake exhaust and when its running and not running ? A fan runs all the time, there is another vent for the carbon filter running also . working on the air coming in ...
Is the fan blowing directly at plants? yes . big fan .
Is the grow substrate constantly wet or moist? No
Is your water HARD or SOFT? Maybe a little hard
What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water? Tap water that I let sit out
Are you using water from a water softener? NO
Has plant been recently pruned, cloned or pinched? NO
Have any pest chemicals been used? If so what and when? Nope
Are plant's infected with pest's? No

 

[Yes4Prop215]

looks like classic nitrogen deficiency, boost up your fert levels see how they respond.

 

[voxberry]

hmm....

hmm....

you think is nitrogen def. ? doesn't it go all yellow at the same time when there is a nitrogen def. ?....hmmm

 

[Kushy]

Looks like a Nit deficency to me to. Throw in a little more nutes and see how they respond. You say it starts from the bottom and goes up is why I believe its a N def. GOod luck.

 

[HeadyPete]

It's not a N def, it's a magnesium def.

Do your nutes provide Magnesium? Many don't. What brand do you use?

How long does your tap water sit? Chlorine in the water can lock out mag. Use an aquarium pump and airstone to bubble overnight. When you adjust ph of your nutes, do it slowly and give it time to stabilize. I will start mixing and adding ph down and check it in 20 mins. Add more PH down, check in 20 mins....the ph will continue to rise until you add just enough ph down to overcome the buffering effect of the minerals (cal and mag) in your tap water. This measure of buffer is known as Total Alkalinity. Eventually the ph will stay at the proper ph (but will rise again slowly over time) and you can water your plants. If you don't wait you will getr a false reading and that ph will be much higher than you think, damaging the plants.

Anyway, I think that you just aren't giving enough mag in the regular diet.

Add 1/4 tsp epsom salts (available at any drug store - contains magnesium and sulfur) per 4 L next watering and wait and see if they improve over the next few days.

Good luck!

 

[voxberry]

yup ... that is what i was thinking , just was not sure about the epsom salts and using it to correct this def. ... thanks a lot ... i hope i don;t post anymore bad news )

peace !

 

[Yes4Prop215]

nitrogen doesnt cause yellow it causes light green, but yea magnesium also does something a little similar. magnesium causes light green but also has a little bit of brown spots too.
instead of epsom salts use Cal/Mag.

also try to switch to RO water if you can.

 

[voxberry]

...

...

thank you for clearing up that for me ...

I allready treated them with epsom salts ... and I hope things will be better soon .

thanks for the answers !

peace !

 

[HeadyPete]

If you want to keep it organic, use un-sulfured blackstrap molasses at 5mL/4L - same as calmag and provides all the same nutrients and more. Up the dosage during flowering for a great carbo boost.

I usually suggest epsom first because either people have it or can get it easily.

Let us know how it goes.

 

[voxberry]

looking good...

looking good...

well, epsom salts worked great I think ... the def. didn't go any further up the plants, so it looks good .

And yes... you can find epsom salts at any farmacy, very easy to find .

peace !