VPD: Vapor pressure deficit (PRO level) ² – Buy Medical THC Online Quebec Canada

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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.

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<p><strong>The vapor pressure deficit (VPD)</strong> really refers to <strong>the difference in the amount of humidity that air has and the capacity of that air to retain moisture until saturation is reached,</strong> that is to say that the condensation of water takes place.</p>
<p>In this graph we can see how <strong>the relationship between the vapor pressure deficit is proportional to the increase in Tª</strong>, that is to say at a higher temperature, greater vapor pressure deficit and vice versa.</p>
<p><img class=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

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<p>During the growth phase the plants do not need much water and it is best to let them perspire at their optimal rate, so the plant will not divert photosynthetic energy, therefore in the<strong> Growing orange stripe matches perfectly with the ideal% RH and the usual growth parameters</strong>, Because in these stages have not yet developed the fruits is more difficult to develop fungi and mold, also at this stage you can apply phytosanitary treatments without affecting the flowers.</p>
<p><strong>During growth we want a low VPD</strong> that is, a high% RH that allows our plants to breathe optimally and grow well, since we know that <strong>high humidity influences the cellular expansion of the leaves</strong> as well as facilitating greater photosynthetic activity.</p>
<h3 style=VPD in Flowering (weeks 1 – 4)
55-65% RH / 23º- 24ºC / 10-13.5 VPD

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<p>During<strong> the first weeks of flowering</strong> VPD increases with respect to growth to slightly force perspiration, this is because in this phase we want the plant to absorb more nutrients, which increases the ability of the plant to transpire and absorb more. water and nutrients from the roots. Since the buds are forming but nevertheless the plant is still growing, we are interested in maintaining a moisture that favors cellular expansion but also favors a greater absorption of nutrients.</p>
<p>In this phase it would be good to have a <strong>very light perspiration</strong> since in this phase the plant absorbs more water and nutrients, but also <strong>we are interested in developing the greatest possible number of outbreaks</strong> and for this we will need a more balanced VPD that facilitates a greater photosynthetic activity.</p>
<h3 style=Flowering (weeks 5 – 10)
42-51% RH / 23º-24ºC / 13-15.5 VPD)

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<p><strong>Lower temperatures and dry environments will allow the substrate to dry more evenly</strong> so that you can have a greater consistency with the irrigations and dried, in addition <strong>low temperatures will preserve aromas better </strong>so in this section you will have to adjust the nutrition of the plant, increasing the amount and frequency of your irrigations or subscribers during this stage.</p>
<p>In this phase <strong>when uploading the VPD</strong>, you force the plant to <strong>absorb more water and nutrients</strong> from the roots what will help <strong>increase the amount of sugars</strong> present in the flowers or fruits but reducing the fresh weight, something very convenient for cannabis. And be very careful, a very high VPD during long periods of time can result in a deterioration of quality and a very low VPD is at risk of diseases.</p>
<p><strong>Another advantage</strong> very useful to use the VPD <strong>is that you can manage how much and when to open the stomata of the plant facilitating the absorption of CO2</strong> and promoting a greater photosynthetic activity and therefore a higher production, the VPD can help you obtain a better quality as well as a higher production ..</p>
<p><strong>During the nights the VPD is not so important</strong> there are usually no large fluctuations because<strong> there are no big changes in temperature</strong>, also <strong>plants at night are not performing photosynthesis</strong> and therefore we are not worried about closing the stomata due to a low VPD to retain moisture, you worry that you have high humidity and can contract fungal diseases.</p>
<p>These techniques can greatly improve your results both in quality and production, for this it is crucial to understand the effects of different levels of perspiration throughout the different phases of the plant. Experimenting is key, but you have to have everything else very well controlled along with this so that it supposes you an advance in your cultivation.</p>
<p>If you have left any doubt or comment, leave us a comment and we will reply as soon as possible.<br />Regards!</p>
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