trainwreck

Since we all know that marijuana produces the resin as a mechinism to stop moisture loss, would it be possible to increase the resin levels by lowering humidity and raising heat to near burning levels with out over stessing the plant or burning it. This could be done with a simple space heater and this **** they sell at Home Depot called Dry-Z-Air which reduces moisture in the air? Any thoughts?

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jayv25

Hey whats up? This has prob been discussed here b4, and im almost positive it has been proven to be true (lower humidity raises resin)
there are Many theories on resin production and its purposes.
Some believe it acts as fly paper to attract pollen, some say its to hydrate the plants during droughts and low humidity. So if that is true, im sure a lower humidity would trick the plant into creating more.

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ogkush

Just wanted to show you a snip of an article I was reading about cannabis...

The relative humidity of the air influences the functioning of the stomata, among other things. Cannabis flourishes the best with an RH of 60-70%. At higher RH percentages, the stomata have problems getting rid of excess water. At a lower RH, the stoma keep releasing water until the plant dries out. At that moment, the stomata close. Then, the intake of CO2 stagnates, and plant growth is impaired. The relative air humidity is also influenced by the temperature in the growing space. Ventilation influences the relative humidity. Ventilating a space makes the RH fall. In some cases it's necessary to install a humidifier in the grow room. The best results can be achieved by using a discharge fan with a variable speed control. This way, you can easily regulate the quantity of air to be removed. When the plants are in the dark, the temperature is lower (the lamps don't give off any heat). So, you would expect the relative humidity to fall (less moisture can be absorbed by the air). But this is not the case; RH increases in the dark. The plants breathe out water in darkness. Therefore, sufficient ventilation must be provided. Too high a humidity level provides considerable risks for the health of the plants. Generally, pests and diseases have a better chance with a high humidity level. Too low an RH is also risky; the plants can easily dry out. Prevention is better than cure . . . Finally, it should be stated that young seedlings and clones generally perform better at a humidity level of 65-70%. Their root systems are not yet developed well enough to take in water fast enough. A higher humidity insures that the young plants will be protected from drying out.

Hope that helps!

trainwreck

Hmm well i guess the lowering of the humidty shouldnt be put into action until a little later in the plants life when it is more capable of handling the extra stress.

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iwishicould

Another while we are on the topic, If one were to say he/she had two fans one smaller one circulating air in the grow cab while the other exhausted the air via cool tube in the room during the light hours, what happens after lights off when the exhaust fan turns off and the rh begins to rise ? Could it rise to levels that harm the plants or does it bring yield and or resin down significantly? Any opinions/theories or suggestions?
IWIC

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dabuddha

my 2 cents
from what i've observed there are three major factors in resin production and they are in this order

1.overall health of plant
2.humidity
3.genetics

lowering the humidity during flowering definetly in my mind increases resin production dramatically and a good humidity for me late in flowering is 15-25% just realize the plants will be transpiring more and require more frequent watering and careful ferting. as far as function of the trichs goes, remember evolution favors advantages which have multiple functions so i suspect there may not be one answer.

lowering humidity hasn't been much of a problem for me cause of the lights, heat, and lots of moving air and i live in probably one of the most humid parts of North America, if for some reason it is a problem buy a dehumidifier, you can get one used for like 30-50 bucks, if money is an issue a short term fix would be those dry rite little buckets that absorb water but they don't last long and the cost adds up.

Iwishicould, I always leave a fan bringing fresh O2 and CO2 on over night but sure humidity could rise, but remember it will drop because the light/heat draws the water into the air in a "wet" room as it evaporates during the day. I wouldn't worry about it being dangerouse unless you live in a sauna RH can go as high as 70% consistently and higher for bursts (think about a rainy day 90%+ humidity). But it's certainly advantageous to have the low RH during flower so long as you control the transpiration and nuting of the plants. Low humidity equals Low chance of mold, and mold is a pain in the arse.

trainwreck

If your low on cash get dry-z-air, its like 5 bucks a bag and it lasts for a decent time. Thanks for your opinons everyone.

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Esthera

Look on google for vapour pressure deficit or go to this link:

http://www.autogrow.com/1_informatio.../info_vpd.html

this gives you more information about growth, humidity, leaf temperature and room temperature.

To raise THC level you should only lower the humidity in the last 1 or 2 weeks before harvast. If you do it to early you will reduce growth to much and growth is what you want.

Also some people turn of the lights 2 or 3 days before harvast which should also increase thc levels.

dabuddha

I have great results, .5g per watt, even with the low humidity which i maintain through flowering remember high humidity during flowering increases risk of mold and mold can not only decrease your yield it could be potentially dangerous. If you decide to keep the humidity high keep your eyes open for mold.

trainwreck

Lowering the humidity during the entire flowering time isnt going to decrease growth, growth would only be affected if you did this before your plant went into flowering.

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