Help auto mazer leaf problems 2nd week in bloom.

[Budbuddy1988]

Hello everyone, I'm new to this site so some patients would be very much appreciated  i have done a few auto grows before but seem to run into the same problems 2nd week of bloom the first 4 weeks are perfect and couldn't look better but it seems every time starting from week 2 of bloom the leaves start looking bad. I'm not sure what it could be I'm thinking either cal mag? Or possibly damp leaves when lights off and possibly burning on lights on? I'll write a list of the grow.

5x5x5ft grow tent
200w 400w 600w sol digital variable ballast
Bulbs: 600w metal halide
600w hps dual spectrum
Air cooled reflecter.
720m2 rvk 6" rhino filter on variable speed control running half speed.
Small computer fan blowing air in from outside not sure how much possibly 120m2
Fans blowing lightly over plants.
Soil: plant magic / 25% perlite mix
Nutes: plant magic don't usually use many?
Ph: I always put water in at 6.5ph
Water ppm (tap water 250ppm always left to sit for 2 days.
Can start using RO if you think it's better?
Daytime temp around 24-25°c
Night temps 19.9°c
Can't seem to get temps up or is this ok? Always liked 26°c usually.
Humidity is always high first 4 weeks 80%
Humidity in bloom is around 60%

I don't feed anything for the first 4 weeks just usually
Pm root stimulant and bio silicon at around 5ml per litre.
Week 4-5 (first week of bloom when nuggets are 1p sized I add 0.5 of pm bloom but after this I always get the leaf problems so I just usually just water and every 2 or 3 feeds do 0.5ml of bloom as don't want to risk anymore damage. Just seems like the first second week of bloom things start going wrong. I really don't think it's nute as I know exactly what nute burn is as I've had this with previous grows. I water 6 plants around 10 litres once a week? I'm confident my temps are to low and the leaves could be getting wet on lights off then burning on lights on? Or possibly a slight nitrogen and or need some cal mag which I've just ordered.

I hope I've given enough information for people to help and I'll add pictures. Sorry it's my first time posting so hope it's ok.
Appreciate anyone's help. Many thanks

[Mz_121]

I'm no expert as I'm fairly new to the gardening myself but I had same prob as was told it was magnesium probs hopes this helps


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[greengiant]

I would say that you're lacking in nitrogen there bud.

It's a fairly advanced deficiency so I can't be sure.

I would try sticking with grow feed (extra nitrogen) in the first two weeks of flowering.

I've never done autos but with photos I always make sure my plants are well stocked up with nitrogen going into flower as the plants don't really process nitrogen as well during flower so having them ready stocked helps.

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[M_C]

I water 6 plants around 10 litres once a week

This is probably something to do with your problem.... but I'd need a little more info...

[greengiant]

Also if the leaves are dropping off easily after yellowing then it's another sign it's nitrogen.

Try some grow feed and see if it greens up.

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[M_C]

Also if the leaves are dropping off easily after yellowing then it's another sign it's nitrogen.

Try some grow feed and see if it greens up.

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I'll go for double or quits on that last 50p bet greengiant

I'd guess that, at the amount of water/feed he's using, he's getting very minimal run off & that the run off is left to reabsorb. Salt build up & lock out

[GanjasaurusREX]

Ohh Interesting ^^

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[TheDogsNutts]

Hello & Welcome to THCtalk.com Discussion forum m8, hope you enjoy yourself and find plenty of useful information on here……..

[Greengrass]

6 plants at 10 litres a week ,is that 10 litres each or between them?
Can i ask What size tubs are they in?
I'm only asking because I've just finished 3 auto mazar in 10 litre pots and they had 4 litres each every 3 days with plenty of run off that they sat in for 30 mins before going back on their stilts

But then again I'm probably doing it bloody wrong

[M_C]

I've just finished 3 auto mazar in 10 litre pots and they had 4 litres each every 3 days with plenty of run off that they sat in for 30 mins before going back on their stilts

But then again I'm probably doing it bloody wrong

Never let the plants sit in their own run off mate, even if it is just for a short time. That is where salt build up problems start