Please Help- First Time Grow- Yellowing- All advise gratefully recieved

This is my first ever grow and so advice from any more experienced growers would definately be appreciated.

Basicly my problem is the sudden yellowing of leaves on the plants (I understand that this is completely normal in the lower leaves) that has developed over the last week or two. I didnt think much of it when the lower fan leaves started going pale green and then yellow as i knew this was normal but as time has gone by it has slowly progressed to the higher fan leaves with some of them now completely pale yellow and some of them falling off. Not only that but it has now started to spread to the bud sites (turning pale green) and i am beginning to worry about it. I was wondering if anyone had any ideas as to why this occuring. Please see the technical stuff below for a better idea of where i am going wrong.

-Big Bud XXL 5 weeks into flowering
-I am using/used 400w MH for growth and then 400w HPS for flowering (the usual 18/6 veg and 12/12 flowering)
-Nutrients: Plagron Growth, Plagron Bloom and Plagron Green Sensations (Not all at once obviously)
-Soil: Fertilised Subtrate Lightmix
-Temperature: Within optimal range (most of the time)
-Ventilation: Fresh air blowing in from the window with the side panels on the tent removed (top of tent door unzipped also). I am fullly aware this is nowhere near the best but i have to work with minimal space and maximum discretion.
-Water: Bottles left open for a minimum of 3 days and then shaken before watering. I use the rule of thumb method i.e. i put my finger in the soil about an inch to decide when to water.
-Other: I occasionally use dry ice to get some extra carbon in there but i also understand that to get the best results from this it has to be consistantly kept to a certain ppm (cant remember exact ppm)

I have attatched a few pictures to give you a better idea of the problem (sorry about the picture quality, I took them on my phone as fishing through my house at 4am to find a digital camera isnt very discreet given my situation)

im not a pro but it looks a bit like mag deficiency. try some calmag or epsom salts

Looks pretty dank to me matey. U sometimes find that as ur nutrients cut out nitrogen the bottom leaves start to yellow n die off. If his was in say wk 2 ad panic but in wk 5 u should b fine. If in doubt or worried add a bit of nitrogen bk into ur feed

Thanks for the input mrt1980 its appreciated but scotia1982 are you saying that this is nothing to worry about?

i wouldnt worry too much about it. ive had the yellow leaves from about week 5 to 6 and still had good budd out of it. if you treat it the leaves wont get any better they just shouldnt get much worse

so do you not know what the cause is likely to be?

Thats my psychosis at 5 weeks n a dy or thereabouts. Notice the same yellowing??

Like a said if this happens before this stage say week 3-4 or earlier a would increase Calcium, Magnesium & Nitrogen. A dont think its Cal-Mag deficiency because it seems worse at the bottom of your plant that would say to me nitrogen and its only at is most important in the vegetative stage and the 1st few wks into flower when the plant is stretchin and preparing to flower....

Dont worry bro your doin fine

thanks for the reassurance fellas and as i said all input is greatly recieved

Not a problem matey us UK'rs gotta stick together lol

haha most definately geez

scotia1982 said:

Not a problem matey us UK'rs gotta stick together lol

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you know it lol specially with Cameron breathing down our necks out to get the small timers lol

But yeah to the OP looks like a touch of Nitrogen def, I generally keep feeding nitrogen throughout flower at about 1/8-1/4 strength along with my bloom nutes just to keep my plants solar panels happy XD

A was under the impression the legislation had changed at end of february. Goin a bit easier on the small timers, up to 8's a comm serv order, up to 5 click dried n a comm serv order. Am sure someone posted that on here.

Dont plan on gettin caught anyway only grow for my own personal, everyone else can get stuffed lol

Oh by the way, sorry to keep badgering ya but i was wondering if ud care to hazard a guess at what sort of weight i could be looking at this rate

Hard to tell mate, how manys in there, how long u veg for?

3 in there, had 4 but the arjan haze must have been a bad seed so i lobbed it. Had it in veg for around... 6 weeks maybe

scotia1982 said:

A was under the impression the legislation had changed at end of february. Goin a bit easier on the small timers, up to 8's a comm serv order, up to 5 click dried n a comm serv order. Am sure someone posted that on here.

Dont plan on gettin caught anyway only grow for my own personal, everyone else can get stuffed lol

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kinda yeah lol the legislation just makes it harder for them to build a 'cost effective' case against a small time grower and you'll still get a record and a fine and if your unlucky community service, just unlikely to go to prison, you still can though lol. It's more down to circumstance and depending on how professional your setup is.

But the conservatives are so anti pot it's ridiculous being conservative and all... The Lib Dem's released a paper last year that went as far as saying cannabis should be legalized and are planning on at the least decriminalizing it (if Clegg can get out from under Cameron's thumb), coffee shops should be allowed as it would bring £.... amount of money to the economy etc. And the Conservatives shunned it and buried it... as usual. Now I vote Lib Dems lol everyone else is utter BS might as well try for a change.

And to the OP, Keep up the good work, keep em happy and you could get anything from 2-20oz lol hard to say or even guess!

cheers mate but as u mentioned before it could be a slight nitrogen deficiency? whats the best way to boost nitrogen without caneing them with all the other nutrients in the food? i heard piss was a good idea

B a decent yield m8 mayb 10+ oz. You'l c a big difference over the nxt coupla wks. The pistils will recede in as the calyxes swell,its pretty impressive to watch. A dnt think you'l b disappointed anyway

with the weight think really low cos then you shouldnt be dissapointed.
i heared they are going a bit softer on the small time growers too. a mate of mine that used to deal is looking at going down tho, hes got his sentancing next week i think. they had him with just over an oz in his house and he thought he got away with it but they checked his texts going back 18 months.

cookiemonster92 said:

cheers mate but as u mentioned before it could be a slight nitrogen deficiency? whats the best way to boost nitrogen without caneing them with all the other nutrients in the food? i heard piss was a good idea

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Just add some veg nutes at 1/8 - 1/4 strength should sort it out... Diluted piss can work just make sure it's absolutely fresh if you let it sit it get's a lot more amonia than nitrogen as it degrades. I use it on my garden plants just do 1 regular length piss in a gallon watering can and fill it to the top with water lol seems to be a good dilution rate

mrt1980 said:

with the weight think really low cos then you shouldnt be dissapointed.
i heared they are going a bit softer on the small time growers too. a mate of mine that used to deal is looking at going down tho, hes got his sentancing next week i think. they had him with just over an oz in his house and he thought he got away with it but they checked his texts going back 18 months.

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Yeah if you get caught they are going to check your history to see if you've been supplying and if you have... well your fucked.