Odin*
Well-Known Member
@Dr. Who
Please clarify, "In over 40 years of growing...", cannabis?
You cherry picked a "buzz word" (biomass). Yes, "biomass" is used in the article, but it states that this information will be applicable amongst varying plants to generate "crops that grow faster, produce greater yields of food or generate more biomass per acre". So, yes, absolutely, manipulating the light cycle will accelerate flowering as well as increase flower production. In my experience, matured plants with a healthy root system that are subjected to 24hrs of darkness pre-12/12 will not only produce more resin, but flower material as well (larger buds).
An acceleration in the onset of flowering will result in shortened flowering time, that's a given. Apply it anywhere. All else being equal, a quicker start results in a quicker finish.
I don't need to explain the benefit of 24hrs of darkness, the research presented does that. I will say that anything longer (36, 48, 72, 96) appears to "stress" the plant, slowing onset. I suspect this is due to nutrient "exhaustion" at each bud site (exaggerated yellowing) and the plant in general.
In my experience, the difference is ~a week to 10-11 days. Purely anecdotal, but these results are (in general) amongst clones from the same mother, in the same room, introduced to bloom periodically, multiples introduced at each interval. Also illustrated varied terpene development and yield (24hrs dark being optimal). I've never counted trich's. Visual, the "nose", yield, and the smoke have been my points of reference. Pepsi Challenge amongst friends and family also.
You say "unlike"- Yes, I did, but I started that side note with "nb" (i.e.; "Nota Bene"). That highlights notable points and includes the information that follows. I did not include all of the information, "nb" highlighted an area of interest, reading that particular section would have "filled in the blanks". Anyhow, this is what I was referring to within that article;
"The situation in LDPs is, however, different. Generally they are less responsive to night break treatment (Thomas and Vince-Prue, 1997). In contrast to SDPs, longer night interruptions are needed, and the flowering response is often semi-quantitative in nature. Furthermore, in contrast to SDPs, most LDPs require far-red light at the end of the light period to interpret the light period as a long day (Thomas, 1998; Thomas and Vince-Prue, 1997). If instead far-red light is followed by red light in the second part of the day, promotion of flowering is poor or absent (Fig. 3). In SDPs the light quality given at different parts of the light period has little effect on flowering. These differences in responses to night or day are not perfectly correlated with SDPs or LDPs, and some SDPs also show a weak response to light quality during the day. For this reason, plants can be classified as either dark dominant or light dominant. SDPs are predominantly dark dominant, while LDPs are predominantly light dominant."
So, exposure to Far-Red and (deep) Red light (or any other color, for that matter) have little effect on flowering in Short Day/Long Night plants, such as cannabis.
Regardless, the information regarding Pfr and Pr (Far-Red and Red receptors), Far-Red Light and Red Light, has been misinterpreted. You are not going to get an extra 2 hours of "Lights On" by exposing the plant to Far-Red. You can, however, assist the onset of Flower by exposing the plant to Far-Red during your first "night" of transition. Far-Red exposure converts Pfr to Pr, low Pfr levels and high Pr levels trigger bloom. Once in bloom, as the article states, qualities of light make little difference (darkness converts Pfr to Pr, so 12/12 sustains low Pr). In other words, trying to get a plant to bloom that is already in bloom won't make it bloom "more".
As this change from Pfr to Pr in darkness is gradual and not immediate, the 24hr initial dark period will convert a greater amount of Pfr to Pr than 12 hours of dark will. Therefore, not only a hastened response due to inhibited ELF3, but a more potent response due to lower Pfr/higher Pr.
Perhaps "counting" was a waste of time. You can't count the qualitative increase in trichome production as you can quantify it. Terpene development, this is what I was referring to. 4-5 days in, when tiny flowers are present, the terpenes developed in that time give off a "finished" scent (when the plants are brushed against). This level of terpene development (in the strains tested) does not occur within 4-5 days of 18/6 to 12/12. With 24 hours of dark, it does.
Please clarify, "In over 40 years of growing...", cannabis?
You cherry picked a "buzz word" (biomass). Yes, "biomass" is used in the article, but it states that this information will be applicable amongst varying plants to generate "crops that grow faster, produce greater yields of food or generate more biomass per acre". So, yes, absolutely, manipulating the light cycle will accelerate flowering as well as increase flower production. In my experience, matured plants with a healthy root system that are subjected to 24hrs of darkness pre-12/12 will not only produce more resin, but flower material as well (larger buds).
An acceleration in the onset of flowering will result in shortened flowering time, that's a given. Apply it anywhere. All else being equal, a quicker start results in a quicker finish.
I don't need to explain the benefit of 24hrs of darkness, the research presented does that. I will say that anything longer (36, 48, 72, 96) appears to "stress" the plant, slowing onset. I suspect this is due to nutrient "exhaustion" at each bud site (exaggerated yellowing) and the plant in general.
In my experience, the difference is ~a week to 10-11 days. Purely anecdotal, but these results are (in general) amongst clones from the same mother, in the same room, introduced to bloom periodically, multiples introduced at each interval. Also illustrated varied terpene development and yield (24hrs dark being optimal). I've never counted trich's. Visual, the "nose", yield, and the smoke have been my points of reference. Pepsi Challenge amongst friends and family also.
You say "unlike"- Yes, I did, but I started that side note with "nb" (i.e.; "Nota Bene"). That highlights notable points and includes the information that follows. I did not include all of the information, "nb" highlighted an area of interest, reading that particular section would have "filled in the blanks". Anyhow, this is what I was referring to within that article;
"The situation in LDPs is, however, different. Generally they are less responsive to night break treatment (Thomas and Vince-Prue, 1997). In contrast to SDPs, longer night interruptions are needed, and the flowering response is often semi-quantitative in nature. Furthermore, in contrast to SDPs, most LDPs require far-red light at the end of the light period to interpret the light period as a long day (Thomas, 1998; Thomas and Vince-Prue, 1997). If instead far-red light is followed by red light in the second part of the day, promotion of flowering is poor or absent (Fig. 3). In SDPs the light quality given at different parts of the light period has little effect on flowering. These differences in responses to night or day are not perfectly correlated with SDPs or LDPs, and some SDPs also show a weak response to light quality during the day. For this reason, plants can be classified as either dark dominant or light dominant. SDPs are predominantly dark dominant, while LDPs are predominantly light dominant."
So, exposure to Far-Red and (deep) Red light (or any other color, for that matter) have little effect on flowering in Short Day/Long Night plants, such as cannabis.
Regardless, the information regarding Pfr and Pr (Far-Red and Red receptors), Far-Red Light and Red Light, has been misinterpreted. You are not going to get an extra 2 hours of "Lights On" by exposing the plant to Far-Red. You can, however, assist the onset of Flower by exposing the plant to Far-Red during your first "night" of transition. Far-Red exposure converts Pfr to Pr, low Pfr levels and high Pr levels trigger bloom. Once in bloom, as the article states, qualities of light make little difference (darkness converts Pfr to Pr, so 12/12 sustains low Pr). In other words, trying to get a plant to bloom that is already in bloom won't make it bloom "more".
As this change from Pfr to Pr in darkness is gradual and not immediate, the 24hr initial dark period will convert a greater amount of Pfr to Pr than 12 hours of dark will. Therefore, not only a hastened response due to inhibited ELF3, but a more potent response due to lower Pfr/higher Pr.
![IMG_20160819_1029557_rewind[1].jpg](/data/attachments/2861/2861601-476b2c836379581a5269d57651d4a0c0.jpg)
![IMG_20160820_1307204_rewind[1].jpg](/data/attachments/2861/2861610-4939b202079a64225c6cdb75fc38dfc3.jpg)
![IMG_20160820_1307278_rewind[1].jpg](/data/attachments/2861/2861611-642f0cbf444cdf891e8eeedb04b4f068.jpg)
(Now that I have some manditory vac time - I decided to spend it on old loves - Cars and speedways!
has anyone tried this???
