Plants dying in new Growroom

It's All Natural

It's All Natural

Member
I have just started a :leaf:new growroom:leaf: in a cupboard i had spare. I have sealed it with culk and industrial tape and painted the whole cupboard white. I have also put down three layers on thick plastic tarpolen and sealed round it.i have a 400w hps (highpressuresodium) light fitted in the cupboard with just an average 2 speed obscaling fan sitting on the floor witch is on 24 hours a day. The Area of the cupboard is = 5 ft long , 7.5ft high , 2ft wide . the light is currently sitting about 5ft from the ground . with my babbies sittin directly underneath it. this is not my first grow op and done 3 previous to this one with sucsess but this is the first time i have used this room and i am running into problems.i can get my babbies to sprout no problem they grow to about 3 - 5 inch's tall with a fair amount of growth then slowly start to die the tips of the leaves showing first signs by turning yellow then this slowly consumes the whole plant the thing thats getting me is its not happening to all of the plants just 2 out of 3. The bigger plants always seem to pull throw it the only thing i can think is there is not enough ventaltion in the cupboard .I have the lights on a 18 / 6 cycle and it does tend to get pretty hot in there do u think id be better to get rid of my current fan and get an extractor fan fitted to the cupboard to help veltalation beacause im confident of my soil mixture and regularly check the ph of my water.

Thanks for your time ppl:weed:
Any responses will be taken with great appreceation!

"What We Need is Love to Help Weed Grow"
 
Woomeister

Woomeister

Well-Known Member
i think that heat is def. an issue and all the oscillating fan will do is act like an hair dryer. Do you know what temps you are running at? Humidity is also a factor that may be contributing to your wee ones demise.
 
abberation

abberation

Active Member
Soundz like heat mate. You sealed that cupboard up pretty well, so you gotta let new air in and extract heated air out.
 
abberation

abberation

Active Member
Woomeister said:
i think that heat is def. an issue and all the oscillating fan will do is act like an hair dryer. Do you know what temps you are running at? Humidity is also a factor that may be contributing to your wee ones demise.
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Also having a fan on in an sealed environment will cause higher are pressure which will induce more heat. CO2 will help, but it wont solve your problem.

:weed:
 
It's All Natural

It's All Natural

Member
Thanks for all the info ppl my lights are currently off just now i will check the temp tonight after my lights have been for a while and get bk to you woomeister
 
Brick Top

Brick Top

New Member
The first questions I would ask are:
　
The first would be does the soil you used have slow release fertilizers in it? If so there is your problem or at least one of your problems. What might be a part two to that question is have you fed them and if so at what age did you feed them and what did you feed them in what quantity and percentage of solution mixture? Depending on those things there might also be your problem or at least part of your problem.

　
The second would be what is your average temperature in your grow area and what is the hottest gets, and also in addition you said the light is 5-ft off the floor, but how high is it off the tops of the plants? Your temperature might be to high for one or several reasons so that could be your problem or one of your problems.

The third question I would ask is while it is good to keep a fan on younger plants, and even later if you can do it properly, it does increase water evaporation through the soil and water transpiration through the plants so are your plants receiving enough water or might they be drying out due to the increased need for water that you are not giving them but that they need due to the constant wind caused evaporation and transpiration?
　
The one comment I would make, and it would not cause your problem but it would make for a better light setup, would be to scrap your HPS bulb for the vegetative growth period and replace it with a Metal Halide conversion bulb, or a regular Metal Halide bulb if your ballast is a switchable ballast. Metal Halide gives plants the proper light spectrum for vegetative growth and a High Pressure Sodium give the proper light spectrum for the flowering period. But that is only a comment/suggestion to improve your setup and not a reason for what you are experiencing.
 
It's All Natural

It's All Natural

Member
abberation said:
Also having a fan on in an sealed environment will cause higher are pressure which will induce more heat. CO2 will help, but it wont solve your problem.

:weed:
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so am i better to remove the fan and just have the lights on for the time being until i get some ventaltion sorted or even have the fan on a cycle ????
 
abberation

abberation

Active Member
It's All Natural said:
so am i better to remove the fan and just have the lights on for the time being until i get some ventaltion sorted or even have the fan on a cycle ????
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I would say leave the fan there. It's doing you more good than harm at the moment. But you need to sort out ventilation asap. Maby just start by letting air out somewhere.

I dont know what your setup looks like, so i cant give you any ideas. If you can post pics I'll have a look.
 
Brick Top

Brick Top

New Member
It's All Natural said:
Some very wise words there brick top will take head thanks for your input m8 trying to resolve this problem is my top priorty just now
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Of course your main priority is to solve your current problem but have you answered the questions I asked in previous messages and I missed them?

If not you may want to so people will have more information to go on. As it is it appears to be a heat issue but it could be something else and it could be a combination of two or more things.
　
Not to sound all preachy but the more information you can give, and the more detailed it is, even if it includes things you may not believe to be a factor the more you increase your chances of receiving the most complete and most accurate possible advice.
　
Again not to sound preachy but you said; "beacause im confident of my soil mixture and regularly check the ph of my water." Well many people have been and are confident of things that do at times turn out to be a problem.

Also while pH meters are great things they do tend to get our of calibration now and then and need to be reset so at times someone can believe their pH is in a good range when they are actually above or below a good range. Mentioning if and when your pH meter has been last calibrated and how you did it might make a difference and if nothing else the more detailed information that can be supplied the greater the number of possible causes for problems can be eliminated.
　
As "Captain Spock" said in "The Undiscovered Country," "An ancestor of mine maintained that when you eliminate the impossible, whatever remains, however improbable, must be the truth."
　
That is totally applicable to the growing of herb and to discovering what the root cause or causes to a problem or problems are.
 
It's All Natural

It's All Natural

Member
I have just went out and bought 2 separate axial extractor fans one for pulling the heat out of the grow room and one for bringing fresh air in. As for my soil I am just using a sowing compost for germination and a perlite mix when repotting and i am using a liquid based ph testing kit i bought for £16.99 and i am only feeding the plants water for the first 3 weeks (only feed when the soil dries out) still to buy some nutes for veggie and flowering. As i said iv been using this method for the past year now experimenting with different products such as (canna,coco etc) with good results it’s just when I moved my grow into this room I encountered problems . so iv sorted out some proper ventilation the sparks coming during the week and should have some fresh air flowing by tues night and hopefully this corrects my problem. As for pics ill try and get some uploaded Asap . if you can imagine the cupboard is built into the wall so there is walk in access there a fair amount of space so I will fit the 2 fans at the top of the cupboard as close to the ceiling as possible if this helps any till i get some pics organised any other comments are welcome .

:leaf:All the comments and suggestions have been great ! all the different ways to improve my grow are noted.:leaf:

:weed:All The Best . ItsAllNatural !:weed:

-"What We Need is Love 2 Help Weed Grow"
 
2

2stroke

Well-Known Member
It's All Natural said:
I have just went out and bought 2 separate axial extractor fans one for pulling the heat out of the grow room and one for bringing fresh air in. As for my soil I am just using a sowing compost for germination and a perlite mix when repotting and i am using a liquid based ph testing kit i bought for £16.99 and i am only feeding the plants water for the first 3 weeks (only feed when the soil dries out) still to buy some nutes for veggie and flowering. As i said iv been using this method for the past year now experimenting with different products such as (canna,coco etc) with good results it’s just when I moved my grow into this room I encountered problems . so iv sorted out some proper ventilation the sparks coming during the week and should have some fresh air flowing by tues night and hopefully this corrects my problem. As for pics ill try and get some uploaded Asap . if you can imagine the cupboard is built into the wall so there is walk in access there a fair amount of space so I will fit the 2 fans at the top of the cupboard as close to the ceiling as possible if this helps any till i get some pics organised any other comments are welcome .

:leaf:All the comments and suggestions have been great ! all the different ways to improve my grow are noted.:leaf:

:weed:All The Best . ItsAllNatural !:weed:

-"What We Need is Love 2 Help Weed Grow"
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Are you sure its not a off - gassing problem from the fresh paint? Try lining with panda film if if you wanna make sure. There tons of problems with grow tents and the plastic's used but there also an article on on of the makers sites about plants and exposure to off gassing from paints to platics and there effects.
 
svchop889

svchop889

Well-Known Member
even if it off gassing ventilation will defiantly help. i would put the intake fan near the bottom though not at the top you want air to circulate through the whole area not just the top
 
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