AutoFlower VPD Chart Issues

A humidifier not dehum sry

There's many different ways. An AC intake from prima kilma will be your best bet. I just bought 1 and they are fairly cheap. 150e for temp controlled AC unit that only uses 110watts. Setting up a negative pressure environment as opposed to blowing air into your tent should also drop temps. But for now, you are more or less if in range of VPD. And as nobodysbuds said VPD is very advanced stuff and you could research it all day and still only have a slight grasp of it. As VPD applies differently to every set up and the environment around it, its why research is so out there. Focus on the basics. Your temp is fine. Ye a lil hot for this young, but not out of the range of being a disaster. Again if you control the environment in your grow room as opposed to your tent you'll have much better success. Cause if you are drawing in air through an intake but using a dehumidifier in your tent you are sucking the environment from your grow room into your tent. Try sort out the environment in your grow room and set up a negative pressure environment and the tent will draw in the environment from your grow room into your tent. Also you really don't need a humidifier in your tent a wet towel with your grow room door closed will bring your grow room RH up and in turn will bring the tents RH up. Trying to fix an environment in a tent is only good if its a sealed tent. As the intake/exhaust brings in the rooms environment. Good luck bro.

Hi, Luftbefeuchter ais in der Blüte. Da mögen sie es eher trocken. Problem erledigt.

AC unit... other things that may help: better configuration for exhaust/intake more efficient lights will produce less heat. these things may be options for a few degrees but nothing major. VPD is solid science... i don't dont the validity... i am curious how much research has been done to map out what is optimal and how a different species impacts those suggestions etc etc... until i read some white papers, hard to take the word of forums and websites that peddle all sorts of urban myths along with good science... or some bastardizations of science etc. so, using hottest of your range -- 28c / 65 RH = 1.32 kPa. This is fine for flower, maybe a tad high for vege, supposedly.. lets say running dehum brings you to 30c / 55% RH, which is a safer RH range to avoid microbials. That is a 1.91 Kpa... probably less than optimal for vege phase, and a little out of range for flower. I had a VPD of 2.5 and it didn't kill anything... i did have to reduce feed significantly, though. the second run was still high, but much better and the results improved. So, i'd guess you'd have some slowdown of some sort with vege'ing plants... though does that translate for autoflowers too? cause they don't change light schedule, so i hesitate to think this is a parallel for them. You can mitigate a high VPD with a slightly lower concentration in your nutrient mix... sure the plant is still working a bit harder than normal taking in water, but you can ensure it still takes in same grams per day of N/P/K/et al. This won't solve all problems, but will avoid the plant building up nutes beyond what it can metabolize in 1 day due to increased daily drinking caused by elevated VPD. obviously, a plant is growing so it needs a bit more each day, but if you have been giving a gallon a day, then after environment immediately changes it needs 1.25 gallons per day... then you know it's probably a good idea to reduce concentration to match new rate of drinking cause no overnight growth will cause a 25% increase. this is just one more relativistic factor that impacts everything else, or just about everything else. this is why we can feed "exactly the same" and get different results. (just one reason and not limited to this 1)

why autos? i find them strangely irritating tbh. they are very unreliable in the sense that you’ll never know what youre gonna end up with as oppose to clones. either case you can defoliate some leaves up top to let the light get to the lower parts. you can also lst but 2 weeks into flowering the benefits will be very limited. are u using a humdifier or a dehum? because an humidifier shouldnt pump heat into your space.

I can’t defoliate into flower on an auto grow so I’m also having the issue of not enough light penetration to the lower plants, just seems like you have zero freedom of control when it comes to auto grows and I just can’t find enough relevant information online to help me out