can some help me please !!!!!!

I am growing white widow they have only been flowering 21 day and im trying to identify whats really going on with like 4 of 12 plants ? they seem to be yellowing at the top but green at the bottom around the second or third node me fan leaves are getting brown spots ? my tent says at78*lights on 64 lights out <humidity is 45 to 60> can someone please give me some insight !!! oh my tent is 4x8x7 with two 600 watt aircooled hoods

Picture #2 looks like a Ca/Mg deficiency but honestly I'd wait until some real grow gurus get here. While you're waiting you might want to give them a little more information on what you are feeding etc....

Yellowing of the leaves can often be because of nitrogen deficiency, or because the plant isn't getting enough nutrients. Often in flowering leaves begin to get yellow because all of the energy is going to producing buds, not focusing on fan leaves. Pick them off, get a fish fertilizer with a NPK ratio of 5-1-1 with nitrogren being 5, it'll fix the energy deficiency causing the yellowing.

you have some heat issues light is too near and phosphorus deficiency! what's ur medium/nutes/pH ?

samster123 said:

Yellowing of the leaves can often be because of nitrogen deficiency, or because the plant isn't getting enough nutrients. Often in flowering leaves begin to get yellow because all of the energy is going to producing buds, not focusing on fan leaves. Pick them off, get a fish fertilizer with a NPK ratio of 5-1-1 with nitrogren being 5, it'll fix the energy deficiency causing the yellowing.

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this is not Nitrogen look at the hole plant not just the affected leaves!

curious2garden said:

Picture #2 looks like a Ca/Mg deficiency but honestly I'd wait until some real grow gurus get here. While you're waiting you might want to give them a little more information on what you are feeding etc....

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Plausible! i'll give it some Cal Mg supp. this will help!

my ph is 6.4 im using ff nutes i gave the widow cal/mag when i first putem in flower 5ml per gallon

rugrat said:

my ph is 6.4 im using ff nutes i gave the widow cal/mag when i first putem in flower 5ml per gallon

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give it some more Cal Mg and put the light higher. me i'll chop 'em not good leaves and watch symptoms.

GanjaHome said:

you have some heat issues light is too near and phosphorus deficiency! what's ur medium/nutes/pH ?

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im using ff nute ph is like 6.4 im growing in the ff ocean forest i have the lights 12" ................

10-1 its fungus of some kind nute def rarely random like yours. H202 spray/feed prob in roots if nothing visible.

herbbilly said:

10-1 its fungus of some kind nute def rarely random like yours. H202 spray/feed prob in roots if nothing visible.

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should i try flushing them cuz its 4 out of 12 ......h202 spray/feed ? whats that ? please explain.....im sorry im fairly new to this and i really want learn this i love growin not for profit but because i love smoking

looks like cal/mag to me

H202 will help a sick plant http://www.using-hydrogen-peroxide.com/gardening-with-hydrogen-peroxide.html. Look at fungus pics disregard powdery pics you'll find symptoms

This is 100% Cal/mag and heat stress. For sure. You can help immediately curb the cal/mag by making a foliar spray, just be careful being that you are in flower (you dont want mold) you should also be adding cal/mag to your regular feedings. You also need to lower your temps at canopy. Do you see how the edges of your leaves look like up turned alligator teeth? This is the plant attempting to reduce surface area of exposure to reduce excessive transpiration due to heat. In the future both of these issues can be slightly strong walled with the use of a silicate product such as protekt by Dynagro. Hope this helps some, goodluck.-S0uP