http://www.plantroot.org/PDFarchive/2011/5_17.pdf
Credit to the plantroot.org site and the authors of this wonderful document.
This link is a pdf of a scientific analysis of root growth rates in relation to photo period.
It's highly worth a read.
A brief summary of the findings are this:
At the time lights go off(night time), a dramatic sudden drop happens in Root growth rates. The plant then gradually increases its root growth rate right up until morning (lights on) when a large spike in root growth rate happens. So if you imagine it on a graph, its starts off at the bottom at lights out and climbs upwards towars morning with a big morning peak.
Then about 1-2 hours after lights on, it has a gradual decrease in root growth rate all day long until shortly before lights out(evening time) when it starts to climb but then does its sudden night time drop again.
So all in all, the growth rate for Roots looks an upside down V. with the peak being shortly after morning. the lowest points being evening time in the 24hour cycle.
Really wasnt expecting that. I definitely would of thought it was the inverse.
Anyways, the report then goes on to show the root growth rate of the plant if switched to a 24 hour lights on period... wow within 48 hours, the lowest root growth rate is already higher than the peak growth rate when on a On/Off light cycle.
The plant still follows the same drop and climb rate cycle as it did before, but the dips get less and less, and the climbing always is higher. So eventually its a far higher growth rate on a 24 hour light on cycle.
The graph doesnt go on for more than about 112 hours after that, but it looks like the dips begin to become less and less and so do the climbs. I imagine it would even out in a fair bit.
After that report, i'm going to try my veg at 24 hours and see if i notice a huge difference after the first 96 hours.
Tt
Credit to the plantroot.org site and the authors of this wonderful document.
This link is a pdf of a scientific analysis of root growth rates in relation to photo period.
It's highly worth a read.
A brief summary of the findings are this:
At the time lights go off(night time), a dramatic sudden drop happens in Root growth rates. The plant then gradually increases its root growth rate right up until morning (lights on) when a large spike in root growth rate happens. So if you imagine it on a graph, its starts off at the bottom at lights out and climbs upwards towars morning with a big morning peak.
Then about 1-2 hours after lights on, it has a gradual decrease in root growth rate all day long until shortly before lights out(evening time) when it starts to climb but then does its sudden night time drop again.
So all in all, the growth rate for Roots looks an upside down V. with the peak being shortly after morning. the lowest points being evening time in the 24hour cycle.
Really wasnt expecting that. I definitely would of thought it was the inverse.
Anyways, the report then goes on to show the root growth rate of the plant if switched to a 24 hour lights on period... wow within 48 hours, the lowest root growth rate is already higher than the peak growth rate when on a On/Off light cycle.
The plant still follows the same drop and climb rate cycle as it did before, but the dips get less and less, and the climbing always is higher. So eventually its a far higher growth rate on a 24 hour light on cycle.
The graph doesnt go on for more than about 112 hours after that, but it looks like the dips begin to become less and less and so do the climbs. I imagine it would even out in a fair bit.
After that report, i'm going to try my veg at 24 hours and see if i notice a huge difference after the first 96 hours.
Tt