will LOW humidity hurt a plant?
Quote:
Originally Posted by Sjapp
you should try and get more exhaust. if you have a greater exhaust than intake it creates a low pressure vacuum effect in the room or box which causes cooling. its how all cooling systems work, be it your fridge or your ac
Thanks for all the feedback Rusty. You are a pal, bro.
Regarding intake vs exhaust, I have heard, and I quote "nature abhors a vacuum." Now, if I can only remember the source and the respective credibility. I know theres a name the APA (psych association) has for that.... but as a stoner, I cannot recall that either :D:D
I have also read that intake fans should be faster than exhausts so that air has time to circulate the cab before leaving.
Not shore which is correct here, but I really appreciate the comments nonetheless.
Maybe Stinky will drop by here. :rastasmoke::hippy:
will LOW humidity hurt a plant?
Quote:
Originally Posted by melodious fellow
Thanks for all the feedback Rusty. You are a pal, bro.
No problem, bro. Just payin' it forward.:thumbsup:
Quote:
Originally Posted by melodious fellow
Regarding intake vs exhaust, I have heard, and I quote "nature abhors a vacuum." Now, if I can only remember the source and the respective credibility. I know theres a name the APA (psych association) has for that.... but as a stoner, I cannot recall that either
Was it "Witches ride brooms, because nature abhors a vaccuum", or "Everything sucks, Nothing else matters"...?:jointsmile:
Quote:
Originally Posted by melodious fellow
I have also read that intake fans should be faster than exhausts so that air has time to circulate the cab before leaving.
Personally, due to my heat concerns, I'd trather have two exhaust fans at the top of my closet or shed, and an intake port (not fan) down low. The suction caused by the exhaust fans will bring in enough fresh air to keep the ladies happy.
During the winter, I use one exhaust fan, and one circulation fan, but during summer I also use the a/c. so I guess technically it's an unintended intake fan.
For me it's better to exhaust the hot air before it gets all mixed around the closet.
Am I right? Shit...I don't know, but it kinda makes sence to me, lol.
Quote:
Originally Posted by melodious fellow
Maybe Stinky will drop by here. :rastasmoke::hippy:
Likely she will be.:thumbsup:
will LOW humidity hurt a plant?
Unless your intake and exhaust fan are perfectly matched, just run an exhaust. Two mismatched fans will actually inhibit air flow and waste electricity.
Your exhaust fan should PULL rather than push air. The duct for the exhaust fan should be high in the room, preferably attached to an air-cooled hood unless you run lights on a separate exhaust loop. A passive intake should be LOW in the room.
High temps + low humidity + intense light are dangerous to a plant.
Light:
The plant transpires and photosynthesizes rapidly in intense light conditions, quickly using up water to form simple sugar by photosynthesis (sugar is a hydrocarbon; water contains a pair of H+ ions. The plant gets the carbon most efficiently from CO2 in the atmosphere).
Temperature:
The plant also cools itself by allowing moisture to evaporate off leaf surfaces.
Humidity:
The plant regulates its water loss and intakes atmospheric gases through the stomata, which are small openings concentrated on the undersides of the leaves. When the plant is trying to conserve water, and closes the stomata, it cannot breathe, and its metabolic systems start to shut down.
What this all means is that when you are running BRIGHT and WARM, you must also add MOISTURE to keep the stomata open, and at temperatures above about 85 degrees, CO2 to ensure that CO2 is not the limiting factor in the plant's metabolism.
When your conditions are COLD, and the plant is transpiring slowly, avoid overwatering, as moisture use/loss slows, and if you want to keep your plants fairly healthy even in low temps, you may want to decrease light intensity as well, because even though they may be able to photosynthesize under bright light, the chemical reactions that take place within the plant happen much more slowly. Below 65 degrees or so the plants become nearly dormant, and may be held in that state only under correct conditions.
It's all connected. Hope that sorta helps.
will LOW humidity hurt a plant?
Well, not to cause any rift, I'd defer to Stinky's knowledge.
Do I recommend this to those with better finances, that can afford the equipment to coddle their ladies? No...but I am saying you can still make it work with a bit of extra effort. I do stand by my post.
I've been forced to do what I do by necessity, and have found that, thru trial and error, low ambient humidity and infrequent misting during flower keeps my ladies from heat damage and mold. When misting or foliar feeding, the water drops act like little magnifying glasses, burning the leaf tissue. (which is why I only mist the lower sections of the plants)
The below pix is link I posted from 2005 on another site, when I lived in Vegas. 100 to 110 degrees daily in the garage (where the flower room was, late spring temps) no a/c, and misting only once or twice a week, if that. 3 gallon pots, in soil, and I believe it was 37 grams average for the topped (shorter, 2 cola's) and 43 grams average for the un-topped. (single cola) Pix are in the link below. I can't really say what the yeild is on my spring/fall grows, as I don't have a scale any more. I truly see that it takes a bit longer to finish, but yeild seems approx. the same.
Keep in mind, too...this is a 80% indica x 20% sativa mix. (ReeferMan's R&D #1 med. strain) Big, wide leaves. My Potent Purple and Swazi strains (both sativas) grow even better under warmer conditions. Don't know if it's the narrower leaf structure, the genetics, or both, but they handle the heat very well.
Anyway, below is the picture and the original grow report link.
(my username there was ThunderLungs)
Reeferman R&D Strain #1 - Reefer World
will LOW humidity hurt a plant?
Those look wicked good.
How much did you find you were watering them?
It stands to reason that strains whose heritage lies in more arid climes would handle heat better.
will LOW humidity hurt a plant?
Thanks Stinky. Hope you don't think I was attacking your knowledge base, as this wasn't my intent. I truly have learned shitloads of valuable info from you.
In the summer, I water in the mornings, and can go thru 3/4 or so of a gallon daily in the 5 gallon pots. 1/2 gallon or so in the 3's. By the next morning, pots feel almost empty, and soil is sufficiently dry. Tiz one of the reasons I dont water to the point of run-off. Am afraid of flushing nutes unnecessarily. Also...I give half strength nutes, twice weekly instead of just once, to make up for volume of water being used. Flushes every few weeks.
Wow...I just read my RM post again. I sure was inexperienced with terminology, back then.
Anyway, I, thru a mid-winter series of catastrophies, will likely be growing the Pokerface and a Swazi or two come summer time. Will start a log, (including temps, lol) when they're ready for flower.:D
I did a cursory search yesterday, trying to find out the elevations of Swaziland, Africa. (the assumed geographical source for the Swazi Skunk) Elevation maps say it's from approx. 50 meters, up to 1500 meters. So not sure if my theory about the skinnier leaved strains coming from hot, arid climates is valid.
will LOW humidity hurt a plant?
Quote:
Originally Posted by Rusty Trichome
Thanks Stinky. Hope you don't think I was attacking your knowledge base, as this wasn't my intent.
Aw knock it off. I'm not worrying... :jointsmile:
Quote:
Originally Posted by Rusty Trichome
In the summer, I water in the mornings, and can go thru 3/4 or so of a gallon daily in the 5 gallon pots. 1/2 gallon or so in the 3's. By the next morning, pots feel almost empty, and soil is sufficiently dry. .... Also...I give half strength nutes, twice weekly instead of just once, to make up for volume of water being used.
This is why you are so successful in low %RH. Your watering/feeding schedule is exactly what you should be doing to make up for the dry conditions. The plants are actually raising the humidity themselves with a lot of that water you are giving them, like leafy green humidifiers.
will LOW humidity hurt a plant?
Aww, Stinky...:computerlove1:
will LOW humidity hurt a plant?
Quote:
Originally Posted by Rusty Trichome
when I lived in Vegas. 100 to 110 degrees daily in the garage
no a/c, and misting only once or twice a week, if that.
3 gallon pots, in soil, and I believe it was 37 grams average for the topped (shorter, 2 cola's) and 43 grams average for the un-topped. (single cola)
this is a 80% indica x 20% sativa mix.
So not sure if my theory about the skinnier leaved strains coming from hot, arid climates is valid.
That is pretty amazing dude, 110F! My plants stopped growing around 85-90 and my humidity is rather higher I think. At least the outdoor humidity sure is! I wasn't misting though... will try that
How long did they take start to finish? I didn't see anything about them temps in your log..lol
Regarding your theory, it may have some significance. In hot, dry climates, plants adapt to have a much higher volume to surface area ratio
In climates with less sun and plenty of moisture, plants do best with very broad leaves, thin leaves, with a much greater surface area than volume
peace
O dude, and by the way.... from your thread, that grow was damn dialed in dawg!
No wonder they decided life was peachy despite the heat.
I was actually quite surprised you used two HPSs wth the garage already being 110F though.
peace
will LOW humidity hurt a plant?
Quote:
Originally Posted by melodious fellow
How long did they take start to finish?
I had to put them into flower a bit early, as we were preparing to move. 28 days veg, plus germination. Flowered to the point in the pix for 40 days.
Quote:
Originally Posted by melodious fellow
I was actually quite surprised you used two HPSs wth the garage already being 110F though. peace
85 - 90 degrees outside would cause 100-110f in the closed garage. Would get up to 130-140 in there, during the summer.
During the summer months, I stagger the lights. Kinda like a light mover. Lamp 'A' on for 6 hours, just before it turns off, lamp 'B' comes on for 6 hours. (floro's on for steady 12 hours) Aggressive fans, low humidity, and raising the lights when need arisis.
Still works for me where I am now, but now I have an air conditioned shed.:thumbsup:
In regards to being dialed-in, I had a bunch of online help, and a local grower to get advise from. altho he was a hydro man, was still able to insist I get the knowledge, equipment and supplies I needed, and avoid the gimmicky bs.
