plant issues pics and information given.

well to start my plants are arond 3 weeks old i have 3 big bangs in a room with 400w hps and fluro blue spec tube . i have extraction and intake running . my temps,s hover around 27-31 . i was feeding with nutes but once problem strated i done flush and have only feeded them on water since.

1st issue - my leaves on lower of plant have brown rusty looking patches on the leavesand turning yellow see in pics .

2nd issue - at the end of the cycle ie 18/6 the last 3-4 hours my leaves drop this may be linked with first issue .

i have had a look at the stick threads in plant problems page but cant decide whats up any advise welcome

plant showin is the worst affected.

I've had it before too, infact I have a slight case of it on one of my white widows. Keep in mind, some strains are sensative to changes in ph, which is what I think you're problem is, caused by your nutes. 3 weeks is too young to be giving them anything, the soil has all they need right now in their life cycle.

When you flush, make sure the water is somewhat warm, and you should wait about 15 min between dumps, during your flush. Gives it time to break up the stuff you're trying to flush.

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al give them another flush the mora once lights are on .

could it possible magnesium def as well ? i was going to try get epson salt see if that helps 2 .

cheers for reply

nah, its not that.

yea man looks like ph problem to me. make sure you check your ph like 4 hours after you mix your nutes in water. it can change after stuff in the nutes breaks down into the water and b TOTALY different then what u tested when u mixed it up.

jumboSWISHER said:

yea man looks like ph problem to me. make sure you check your ph like 4 hours after you mix your nutes in water. it can change after stuff in the nutes breaks down into the water and b TOTALY different then what u tested when u mixed it up.

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Good advice from Swisher.

if your under a 400w hps, you plant will need more room very quickly. the younger it is, the easier it is to do this.... your using soil with a drip system right? looks overnuted due to overwatering. if you transfer to say a 3 gal. pot, which is what i use for my girls under 400w, you wont even have to adjust drip