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Moses249
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- 33
can you point me to the thread on vpd,im interested in reading it.i run my rooms at 30-35% with no problems but i keep my roots happy and my temps in check.
if your day time temps are 70F what are you doing for night time temps? staying the same or going down to 65?70% @ 70° F for the win. I diffuse a blend of rosemary, lemon, eucalyptus, clove, and cinnamon oils to kill all airborne pathogens. Never seen botryitis or any other mold since I've used the essential oils. PM does not depend on humidity to manifest, it prefers big temperature fluctuations.
Google "VPD" for some fun reading, or find the thread her on the farm.
I've had excellent consistent results since I became aware of vapor pressure deficit in my grows.
I run 70%+ humidity through most of flower- including to the end recently, and my plants look none the worse for it. I've always tried to keep my humidity up from veg through mid bloom; the higher I got it, the better my girls liked it, up to about 75%.
This is especially important for co2 supplementation, as low humidity actively interferes with the plants' ability to take up the gas. Raising temps into the low 80s helps by speeding up plant metabolism, but again one has to mind their RH closely, so that it stays up near 70%.
People are buying big humidifiers to counteract the effects of their huge AC units' tendency to dry the air out. What these guys are doing is very wasteful from a power usage standpoint; after all, they are paying to remove that humidity- and they'll pay to remove what they're adding!
Using a chiller and air/water heat exchangers greatly reduces the loss of moisture- this is just one of the many ways water chilling can save you money!
i run 78f & 30% rh lights on and 65f & 35%rh at night and im pretty sure my plants r getting plenty of co2.i think it comes down to what they get used to,what they were germed and vegged in as well.heres a pic just to show co2 intake lol
View attachment 306072
i run 78f & 30% rh lights on and 65f & 35%rh at night and im pretty sure my plants r getting plenty of co2.i think it comes down to what they get used to,what they were germed and vegged in as well.heres a pic just to show co2 intake lol
View attachment 306072
but im not putting any co2 on the table ;) during hot summer months i will shut off my intakes and switch to sealed with a/c but then running bottled co2 naturally brings rh up around 55-60% towards the end on the cycle.the bud in that pic is 46g and leaning on a 16 oz solo cup,im pretty sure i would have mold problems with that strain if i ran 70% for most of flower.i would say new growers should aim for 40-50% at all times with or without co2 even though the topic was not about co2. and more experienced growers could benefit from slightly higher numbers.the article from maximum yield is good,but are they talking about pot or lettuce?thats one reason i take anything from that mag with a grain of salt,but i do read it.If you're running your rh below 60%, I guarantee your girls are leaving co2 on the table.
have you had it?if so,what caused it?I'm with ttystick and altitude, I've always run higher RH in flowering because I saw better response. Haven't ever had powdery mildew be caused by high humidity.
have you had it?if so,what caused it?
nice ,you have 2 screen names ? are you sure it was temp swings.what makes the powdery mildew spores bloom and what do they feed on,temps or humidity?i ask because the ONLY time i ever saw it in my room was with rh over 65% never mattered what the temps were cause they have been all over since i first started growing indoors.one of my buddies runs @ 72f day and night and has several major pm outbreaks. i recommended a complete shutdown and bleached floors,walls,ceilings,clean all equip and start over from seed.well he got it agin as soon as he started flower ,as his rh climbed to 65-70% when the plants got big.so now i let him run my sulfer burner a few times and he runs a dehumidifiyer @45% and no more problems going on 6 months.Yes, I've had it. It showed up as a result of big swings in temp and humidity between day and night.
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