Tom,
Over the years, I have seen good pigmentation and good the rest of the secondary plant compounds result from two external stimulus.
First, let us make the obvious assumption, you are a good grower.
Good nutrition, good growth medium, good environment.
Second, you look to have interesting genetics.
I am going to over simplify this, because I don’t know what you know or don’t know… It is not a reflection on your knowledge, but a way for me to simplify the explanation. If you want more details about the pathways for all secondary compounds. I will give you source references. But, that is a week day item for me.
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So let’s look closely at things that effect pigmentation and secondary plant compounds.
First, Pigmentation is definitely genetic. But, to get optimal pigmentation temperature and light is the key in short day plants.
Secondary plant compounds is a fancy way to say what natural defense is the plant. Mostly they are control mechanism for pests. This is definitely true in cannabis. There is one species of plants that produces THC but no CBC.
So on pigmentation, is easily manipulated. You have see this already. But, when high levels of light in terms of total intensity. A plant will compensate in two really cool ways. First the chloroplasts in the cells will reorganize from parallel to the light source to perpendicular. You can see this with a good microscope and a microtome to make thin slices. Or you can find good pictures. The second method plants employ is adding there oun sunscreen, the are the primary pigments.
The down side of too much light is total capacity sugar production goes down during the vegetative stage. This is the opposite of what we want for a shortest production cycle. I suspect the excessive amount of UV light is part to blame for this effect. LED can produce more UV light than is really needed. But, UV light management well is good control method for some of the common leaf fungus. But, you probably can do the same thing by spiking the UV for just 5 minutes every hour. Or once or twice a day in the vegetative cycle for 20 minutes.
Cool temperature during the flower development cycle, with bright light will develop the most common pigmentation to there maximum genetic potential. This is definitely true in cannabis. We can see this from the hemp production notes from the WW2 period. 1944 we produced more hemp than any time in US history. I don’t remember the total tonnage, but it was vary impressive. It was greater than corn that year.
Now secondary plant compounds. This is a tricky subject. Cannabis produces THC and CBC’s at a base line level. But, When a stressor is added the secondary plant compounds go through the roof. Each grower with higher than expected levels has some stressor, in there growth cycle, by accident rather than explicit design. Some are using low soil pH causing to much uptake of some elements over others. Other growers it is because of an infestation of insect. Other growers are using sulfur. Some growers are using light.
The growers using light, in my opinion are on moving along the best path.
We know in cannabis there is a direct correlation between total dry weight and secondary plant compounds. The more dry weight the more secondary plant compounds.
I think adding UV light during the flowering cycle, above the saturation point will produce the greatest levels of secondary plant compounds. This is causing small injuries to the leaves.
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Conclusion of my observations. We want the most growth during the vegetative cycle. CO2 is most like Avenue for increase of total dry weight. Assuming we have optimal nutrition and growth conditions. This is why I am so interested in Adding CO2 to water and applying it during the growth phase to the foliage. CO2 will move through the the leaf cuticles. More CO2 is generally the greatest limiting factor, in the creb cycle. That is why C4 plants are so much better at dry weight than C3 plants.
Light manipulation is also key. We waist a lot of energy on lights. We know that picking the spectrum to the absorption pigments of a plant reduces total costs. Look at the indoor veggie people. They figured this out first. Only give the plant what it wants.
From the voices in head
Ethan.
@FarmerK, you might like this.