If you are an advanced grower, you have probably heard about the vapor pressure deficit or VPD. This cultivation technique it is a very risky tactic for the health of your crop. If you are a new grower and you do not have humidity and temperature well controlled you must first control these parameters well in order to apply the correct VPD levels. Normally we would only advise to try to cultivate using VPD parameters to advanced growers, already optimized rooms or growers who have implemented CO2 systems.
Even being a high risk, this technique can provide great advantages to the growers of very advanced level who are looking for new ways to increase quality and yields of their crops just by improving the conditions in which the plants are.
With the optimized cultivation room, with the precise controllers and the correct equipment in terms of extraction, ventilation and climate is when we can put on the VPD and increase the quality and production of our space.
What is the vapor pressure deficit or VPD?
The vapor pressure deficit VPD is a concept based on a more accurate measurement of humidity than the already known relative humidity (RH%) that our hygrometers measure, this new concept is based on the transpiration of the plant and not in the amount of moisture present in the air as does the RH or relative humidity. The VPD refers to the capacity of the air to retain moisture as it changes its temperature and humidity but does not reach the point where it condenses.
The relative humidity (RH%) is a good measure to know the amount of water that is in the environment, something very useful to prevent fungal diseases, but nevertheless It is much more relevant for the crop to know the capacity of the plant to perspire or to retain water and how their plant physiology changes as these VPD parameters go. This will give us a better understanding of the processes that occur in our crop allowing us the possibility of enhancing quality and fruit production as we play with these parameters.
All of us who cultivate know that Relative humidity or RH% is a crucial issue to be successful, for this reason many growers change from the concept of environmental humidity to concepts more typical of modern agriculture such as the VPD, since the use of VPD strategies gives us a more accurate idea of the physiology of the plant in terms of humidity.
Using the steam pressure deficit techniques you can get better results, using VPDs you can try to find the perfect balance in each moment of the plant for favor a better photosynthesis in her.
But how to apply VPD values to the crop?
It is necessary to analyze the table carefully to see that VPD favors us in each stage according to the process through which the plant passes. A viable strategy would be this that is explained here and in which we distinguish 3 different phases.
VPD in Growth
65-75% RH / 25º-26ºC / 8-11 VPD
VPD in Flowering (weeks 1 – 4)
55-65% RH / 23º- 24ºC / 10-13.5 VPD
Flowering (weeks 5 – 10)
42-51% RH / 23º-24ºC / 13-15.5 VPD)
Here’s what you need to know before seeing your local medical dispensary:You will require a physician’s recommendation, medical cannabis certificate, and/or whatever appropriate documentation is required by your state. Ordinarily, you must be 18 or older to be eligible for a medical authorization, but exceptions may be made in some states for minors with especially debilitating problems. You will often enroll with a medicinal dispensary. This is to maintain your medical cannabis recommendation or certification on file for regulatory and legal purposes. There will be a waiting space. This is to control the circulation of product and patients, but a simple dividing wall also gives patients solitude and direct one-on-one contact with a budtender to candidly discuss medical problems. This procedure can help budtenders and patients monitor effective medicine as well as have a living record of manufacturers and goods for future reference and follow up. Medicinal dispensaries usually allow you to smell and analyze the buds prior to buy. This might vary from state-to-state.
Yes, municipal approval is required before the AGLC will subject a retail cannabis license. Applicants must get in contact with their intended municipality to learn requirements concerning municipal retail cannabis laws, zoning requirements, land-use limitations, and place requirements regarding how near a retail shop can be into a provincial medical care facility, school, or parcel of land designated as a college reserve.
Keep non-medical cannabis legal Adults who are 19 years or older are in a position to:Possess up to 30 g of authorized dried cannabis or the equivalent on their person. Share up to 30 g of legal cannabis with other adults in Canada. Purchase cannabis products from a Yukon Liquor Corporation licensed retailer. Grow up to four crops per household. It is illegal to provide non-medical cannabis to anyone under the age of 19 and also for anybody under the age of 19 to possess any amount of non-medical cannabis in Yukon.It is illegal and dangerous to drive while under the influence of cannabis or other intoxicants.