Hey D9, whats the backstop fencing called (opening size?), and if you got at a big-box store, mind saying which? Thanks.
stagehand
it is the cheapest grade 2"x4" mesh from lowes. i bought the 36" high 50' roll.
i think i saw 48" there too.
Hey D9, whats the backstop fencing called (opening size?), and if you got at a big-box store, mind saying which? Thanks.
stagehand
hey bud buster! welcome to icmag!
not intelligence so much as a very sophisticated evolutionary survival strategy.
this is an actual molecular level switch that functions in real time like a light switch on the wall. controlling morphological adaptations to changing light conditions through gene expression.
when viewed in this context defoliating no longer can be described as "stunting".
instead it should be described as better resource management.
if, under any given set of conditions, the plant has a limited amount of resources available for growth, for mass building, would you rather have the plant busy building stem or bud sites.
paying attention to the leaf area index all the time so you don't induce serious stalls.
These stem from the fact that a doughnut is really just a pie with a hole in the middle. Fewer, larger plants have to be physically worked to accomplish a circle of the right size, which, with a 1k bulb, is 30-32”. a circle with a radius of 15-16” from the center of the arc tube. You are stuck with this as this is what produces the maximum rate of photosynthesis at 1500 umols of photon bombardment.
The circumference of this 32” circle is 100.53”. so with 2 plants you have 50” of “face” each. 3 plants 33”, four plants get you 25”, and so on.
Also, at 16” from the center of the arc tube, the sweet spot of a 1k bulb is only 16” high. 8” arc tube plus about 4” either way up and down.
But, if you center the bulb in the middle of plant mass you can illuminate approx. 36” of vertical canopy adequately enough.
This is great, fantastic stuff, thank you for posting it. Just to be clear, the ideal canopy in a vertical grow with one 1k bulb centered in the middle of two plants is 36" from top to bottom and 32" from side to side?
Zeke99
The way I interpreted him was that the circle is 100" around. If you try to fill that circle with two plants they would have to be 50" wide by 36" high....which would be pretty awesome.
Is that what you were asking or did you mean the 32" to refer to the width of your donut and not the circumference?
I remember a few pages back people were discussing timers, and the cap art-dne had some bad reports for reliability. The sentinel drt-1 timer appears to have been discontinued. Are there any reliable off the shelf units other than this and the cap art-dne that can handle the timing for ppk pulse feeding?
Just a reminder guys, to rate this thread. I just added the first 5 star rating
I grew up with feet and inches and had to convert in high school. So I'm fine with both.Ya'll use metric though.
This is great, fantastic stuff, thank you for posting it. Just to be clear, would the ideal flat and vertical canopy with one 1k bulb centered in the middle of two plants be 36" from top to bottom and 32" from side to side?
sorry for the delay. i've been doing routine medical tests this week. done now.
there is no such thing as an ideal flat and vertical canopy with a 1k hps bulb because the bulb can only be at exactly 1500 umols on a few square inches. if the dead center is correct the edges must be incorrect and vice versa. the light at any given intensity describes a convex pattern. so you have a parabola meeting a flat plane.
but about a sq yard at 36" or a square meter at 39" can be covered adequately with the bulb centered in the mass.
the problem here is that if you get so focused on the 1500 umol number that you start cutting back on foliage you are going to cut back on overall yield too.
even though the bulb can't produce the top rate of photosynthesis on a plant part it still is capable of producing significant weight.
the sweet spot is only about 16" high but unlimited horizontally up to the 32" circle circumference of around 100 inches.
although the max rate occurs at 1500 umol you don't get photo inhibition until around 2000 umols. so if, and that's a big IF, you can work the closest part of the plant at 2000 umols without burning, you get more from the rest of the plant.
2000 umols is roughly equivalent to 10,000 fc.
They're out of stock. what I'm told is that hydrofarm, sentinel's distributor, is transitioning to a new line or company called autopilot. they don't have a replacement digital recycling timer, but instead an analog one, which appears similar to the cap art-dne or the apollo 12. :/
sorry for the delay. i've been doing routine medical tests this week. done now.
there is no such thing as an ideal flat and vertical canopy with a 1k hps bulb because the bulb can only be at exactly 1500 umols on a few square inches. if the dead center is correct the edges must be incorrect and vice versa. the light at any given intensity describes a convex pattern. so you have a parabola meeting a flat plane.
but about a sq yard at 36" or a square meter at 39" can be covered adequately with the bulb centered in the mass.
the problem here is that if you get so focused on the 1500 umol number that you start cutting back on foliage you are going to cut back on overall yield too.
even though the bulb can't produce the top rate of photosynthesis on a plant part it still is capable of producing significant weight.
the sweet spot is only about 16" high but unlimited horizontally up to the 32" circle circumference of around 100 inches.
although the max rate occurs at 1500 umol you don't get photo inhibition until around 2000 umols. so if, and that's a big IF, you can work the closest part of the plant at 2000 umols without burning, you get more from the rest of the plant.
2000 umols is roughly equivalent to 10,000 fc.
I have not defoliated much before, but after reading these materials and your comments, I get it and have incorporated it into the current garden.
Would you care to offer a starting point for distance between two cannabis plants to avoid detecting each other? 36"? I'm will be switching to a rectangular bloom formation and might be able to pull off 36".
I built 6 new PPK's today, linked the buckets with tire valves and black rubber fuel line. I did make a change though I put the float valve in one of the buckets that I will grow a plant in, hooked up to a 18 gallon reservoir. And by the way a HPS will power a solar panel to run a DC boat sump pump for my pulse. I'm running a mix this time, Northern Lights x Big Bud, AKxSk#1 and Blue Widow.