brown spots on leafs

[shogun]

hi everyone here is a cpl off pics of my plants they are starting to get brown spots on leafs..
the plants are 2 weeks old the ec 1.2 ph 5.5-6.0..res temp 67f..room temp..74f-76f..humidty 20%-35%
under 400 watt hps does this look like Magnesium deficiencey..if it is how do i fix it with epson salts..thanx alza

 

[shogun]

11 views and no one knows!!!

11 views and no one knows!!!

come on guys someone should no whats up with this plant...shogun..

 

[Guest]

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[Dr. G]

they look hungry to me

 

[Guest]

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[MynameStitch]

Looks like ph or phosphorus issues; the reason why not many helped you is because we need more information about your grow.

How big are these plants; to me 1.2 is to high for those plants; not to mention how often are you checking your ph and PPMs?

Also are you clabrating your meters regulerly?
Are you using RO water? Tap water? Do you have a water softner?

What nutrients are you using and what setup? Water farms?
Calicum can look like that to after the red spots go away and leaves over dead tissue.

 

[shogun]

more info sorry

more info sorry

hey guys sorry i didnt put enough info..here it is the system in ebb & flood table converted to drip system with 9- 6.5ltr pots with clay pebbles i check ph & ec everyday i dont have ph meter i use ghe test kit..i am using tap water plants are about 3 weeks old & they are about 6ins high..shogun

 

[Guest]

looks as a pretty bad phosphorus def. If it is the spots will get bigger till the plant dies.DOA

 

[shogun]

phosphorus def

phosphorus def

hi octodiem is there somthing i can do to fix it???shogun

 

[Guest]

are your roots ok ? looks similar to when i experienced the dreaded root rot on my nft table .

 

[DD4Y]

The actual cause of the brown spots are cell collapse due to the plant drawing nutrients from the leaves. You need to determine why that is happening. It implies root malfunction to me. This could be from ph issues (calibrate your meter), nutrient burn or fungal issues (aka root rot).

Adjust your ph, AFTER adding the nutrient (I know, it seems obvious but I have had customers make that mistake)

Are you doing anything to get oxygen into your nutrient solution? Suggestions would be to use an aquarium air pump with an airstone, or to add hydrogen peroxide to your nute mix.

I agree that an EC of 1.2 is high for plants that young.. There is a good possibility that your problems stem from shocking them with too strong a nutrient solution. For vegging young plants, 0.8 to 1.0 is better, even start with 0.6. What nutes are you using?

 

[shogun]

hey

hey

hi everyone here are some answers to your questions..yes i adjust ph after
adding nutrient..yes..i do have aquarium air pump with an airstone, but i was told tto remomve it as it affects ph!!! roots are starting to come out bottom of pots and look nice & white..i have just put plants threw a flush today with
nutrient set at 250ppm..when i make up nutrient after flush i will make it at
ec 0.8..later dudes & thanx for the help shogun...

 

[DD4Y]

.yes..i do have aquarium air pump with an airstone, but i was told to remove it as it affects ph!!! ..

The roots need oxygen added by the bubbler. As well, bubbling water stabilizes the ph. This is because water is made up of two Hydrogen ions and one Oxygen (sometimes called H2O). If you leave water alone, it naturally starts to drift into two sets of ions: an 'H ion' and an 'OH ion'. ("Ion" just means "charged particle".) The H ion splits off the water molecule it was hooked up with and floats around until it finds an OH ion which will have an opposite magnetic charge. Opposites attract, and so the H ion has found a new mate. pH stands for "potential Hydrogen". It is a measure of free Hydrogen ions in a solution. The airstream in the water creates both circulation and introduces more fine Oxygen molecules for the H ions to get it on with. Thus, pumping air through the nutrient solution does not CHANGE the pH--it only stabilizes it.

 

[shogun]

air stone

air stone

hi DD4Y i have just added air stone thanx for the help..shogun..

 

[jumbo_grimes]

Air stone affecting PH

Air stone affecting PH

The only time an air stone affects PH is if you are using your pump inside a CO2 enriched room in which case the extra CO2 does become carbonic acid in the nute water and can lower PH.
The big thing to remember about air stone pumps is to keep them away from the reservoir because they can pick up the ethylene gas that is sparged off the reservoir by the air stone bubbles and pump it back in to the nute solution.
Best bet is to place your pump outside the room and pipe the air in. That also helps to keep the reservoir cool by blowing colder fresh air through rather than grow room temp air.