3 week old BBC under a 400w MH about 1.5 feet away.


Why are they pointing upwards, and the lower leaves yellowing?


1 of them got burnt, but recovered. Thats why it looks like a crisp.

The leaves pointing upward is a good sign, don't worry about that.

The lower leaves are yellowing because they're hungry. Time to repot into some fresh compost mate ASAP, they are starving.

There are also a few necrotic spots on those leaves... could just be from the nitrogen def (yellow leaves), but it could also be LSF/mould - what extraction and air movement do you have going on in there?

What are you growing these in btw?

Leaves pointing upwards is usually a good sign but I don't like the look of that.

What compost are you using and how much are you watering?

They was in B&Q seedling soil last week. I was advised on here to repot them into the same pot with the main soil id be using.... B&Q Multi with John Innes (again advised here)


There are in a 60x60cm DR which is my veg tent. Passive intake, but no mechanical extraction, although I can easily open it up and let the air in during light hours.

The are 23 days old, nex is 1.5 ltr, then 6.5 ltr pots.....they will be moved to a 100x100cm DR where I will attampt a SCROG (and probably fcuk it up)

Are the roots showing out of the bottom of the pot yet? Has the yellowing got any worse since you re-potted them?


You need extraction if you're using a 400w hps mate!! Especially in such a small space! They need to be able to breathe.

What is your min/max temp and RH level?

I didnt have a thermometre in there. Ive just stuck one it and left it, its reading 97f.....now I know thats a problem....... around 70s?

Min im not sure ill check tonight.

I can see the odd root at the bottom of the pots, but they aint a massive ball yet.

RH....pretty new mate so could you explaine that one please.

Thanks for the help.

New growings looks ok,those lover leafs with hunger spots will die out anyway .I had leafs pointing so much upwards when i forgot to water them for a day and then gave them a huge run off watering they went madly upwards even more then your s/sadly i didnt picture that/it was on SB mothers wile they were still young

I have fixed open the 2 passive intakes as they kept falling down.

Put the 6" fan in front of the lower hole in the tent you feed the wires through so its sucking from outside and blowing the tips of the plants. Temp right now is mid 80s.

Left tent door 2/3 open to extract heat.




Would it hurt to get stick them in the 1.5 ltr pots? They are 23 days old.


Also, I did give them a dose of PM Essence a few days ago as I done my hydro grow.

bump

you only want to pot em on as they fully root thru their current pots


tbh your facing a losing battle mate unless you sort some proper intake/extaction

When you say fully root, you mean the bottom looking more roots that soil?

Using the fan as an intake seems to have cooled it a little + leaving te door open. Tems is 80f now. That be ok?


Could the fact im not using my brass rose to water be a factor? Im just using the can as the rose is too big for those small pots.

What SD said,if roots are like this or more pot them up http://www.uk420.com/boards/index.php?act=...t&id=349485

RH stands for Relative Humidity. You need a combined temp/humidity sensor in there, like this.


This isn't going to cut it man, you need to extract the stale and hot air out so that it can be replaced with fresh air. You need something like this, ideally with a carbon filter, like this (to filter out the smells ).

I got all that in the main flower tent. This veg tent is only small and I didnt really wanna spend no more on it.


Why cant someone make an extractor that flips from in to out every 15 min.



I suppose I could get a budget extractor for 30 quid. Not to keen in spending 60+

Can't you just fit a y piece between the extraction fan in you're other tent and instead of connecting a cf just run some ducting

Something like this

[spam removed]

Different room. Great idea though.


As a temp measure till I can get another fan, ive got the small veg tent door wide open with the fan blowing air in. Enough air exchange I reckon. Windows open too.

Won't that attract all the nasty bugs mate?

Im flushing my hydro grow in my flower tent 2mo so ill have to risk it. Ill pick a fan up for the next load.



Ive just moved away from hydro as ive had a nightmare with my homemade NFT. Then I saw what you can do with SCROG & an NFT pro kit.

You're just pushing it using 400w with no extraction, they're going to suffer as a result. If you insist on having no extraction, use a 2x55w fluro or something like that.

M8 i really dont understand people like you you want great bud & people are telling you what you need to do but no....... you dont want to land out cash for the grow kit.....if you want quality buddage my friend, you get out what you put in, its all for your own benefit at the end of the day

If this is only a veg tent i'd be tempted to use enviros, plenty good enough for early veg and lots less heat, if you've got an intake fan on your main room you could also use that for your extraction from your veg room and the heat produced in the veg room keeps the temps up in the flower room at lights out.

I dropped the CFL and smashed it. I had the MH there so just used that, so was not prepared for the heat in the small space.

Im just about to buy a TT125 for the small tent. Am I best using this as an intake or out till I get another?

if youve not got anything yet then use it as extraction fella

I have a vent hole at the top of the tent where heat is currenty escaping. Extract from top of tent or at plant level?

So how is that research going anyway?

always best to extract from the top m8

what research is that m8?

Mr Randalizer seems to be stalking me. He dont like people to post questions on a forum, he prefers them to use the old time consuming method of finding out theirself. Then using the forum for....????

Is research not asking people, to educate yourself?



Although I must add ive mastered the search on here in the last few days, so found less need to post Q's. (searching thread title brings much better results)

Ok so fan on route, your all right, ill regret it at the end and one ive got it, ill benefit for years to come.



Got another question for you.....

Moisture Traps (substitute for dehumidifier)

What is you opinion on these? We use one in the showe room and it does do a job in there, so surely in a 1x1 tent it will be ok?


...saying all that ive just saw a rechargable one for use in caravans...are they ok?

any good?

Extraction in. The top of the tent is cooler, but not the lower part. The shade seems to keep the heat underneath as its onli a 60x60cm tent.

I know you extract from the top, but can I extract from the bottom as ive got 2 holes at the top that I can use to let the heat out.

Pics added...they look fucked...1 month. In B&Q Multi with JI

Sorry Healthystealthy, I meant to direct that at our friend here. Seems he wants to ask loads of questions, rather than reading up on the excellent info here. It struck me as funny that he isn't even bothering to listen to advice that he asks for.



Anyway....

Heat rises (this is why a hot air balloon works). That is why we extract from the top as it is hotter there than down below. Also, if you leave your vents at the bottom of the tent open, ambient air (hopefully it is cooler) will be drawn in as hot air escapes.

The other aspect of air is that it will stratify. That is the air will form temperature layers and not mix. Opening the lower vents will help this problem but the best fix is to have an oscillating fan as well as opening the lower vents (and having an extraction fan). This mixes the air up which helps prevent all sorts of problems. If you can visualize how air flows, it will help. Try wikipedia to research some of these areas.

If heat is still a problem, you will need to bring in cool air (from somewhere) using a fan and ducting.

One last thing. When people are trying to help you (as I was by advising you to do some research on your own) don't be snide and flip. It really makes people not want to help you.

Good Luck!

The temp is 85f at the moment. Need for better intake?


Winter is coming here, and its getting colder each day.