this is incorrect... the pollen will fertilize the bracht pretty much as soon as there are pistols, which will appear before males release pollen... The difference is the males make pollen then die, the females take that pollen and would develop seeds in the few weeks after males release pollen. We elongate the females flowering time by not fertilizing them with pollen.
Post the dumbest advice you have ever heard here!
- Thread starter Mr Bomb
- Start date
Spanishfly
Well-Known Member
I have spent many years LECTURING differential and integral calculus courses, up to MSc level. I am talking here about the laws of reflection and how they apply to randomly positioned reflective surfaces, which has nothing whatever to do with more advanced mathematics. Maybe you could give an authoritative reference to support your comment, but I wager not.
And I can assure you that no way is a bit of Al foil going to be able to bring infra red radiation to a focus. Which is what is needed to create a hotspot. If you were to take the parabolic mirror from my Maksutov-Cassegrain telescope and very carefully position it between a heat source and a plant you might JUST be able to bring heat rays to a focus and cause a hot spot. But a piece of randomly crunched up (or not) Al foil - no way.
So go on using Al foil if you want, guys - this IS an Old Wives Tale. You will NOT get hot spots
Spanishfly
Well-Known Member
You could say WHO REALLY CARES about any single point raised in this thread. Such a negative attitude.
WHO REALLY CARES about any single thread raised in RIU if you want to be totally nihilistic???
SmokesLikeBob
Well-Known Member
Do you think a parabola, focused enough to create a "hotspot", can occur on aluminum foil solely by coincidence???
SmokesLikeBob
Well-Known Member
Either way...over-feeding is still very bad...
senioreldano
Member
ive heard about people drinking there bongwater!!
how fucked up do you have to be then. ive smoked on and off for about 14 years and ive still never had that idiot thought!
how fucked up do you have to be then. ive smoked on and off for about 14 years and ive still never had that idiot thought!
on al foil: I think what is being missed is the arc size... consider the miniscule arc of a mh/hps to the size of say a 23/42 watt cfl... while I concede the possibility of a small arc being focused enough (especially the rounded corneres of totes or soemthing(although if you put a mh/hps in a tote you are a braver person than I ) ) by foil or any reflective surface I'm thinking focusing the very non-pointlike/diffuse light/infra red source of a CFL is much less likely
Whats not being mentioned is that foil conducts electricity very nicely, and as such if you're not grounded well, could cause more than a hot spot, that in itself is a good idea not to use it.
Whats not being mentioned is that foil conducts electricity very nicely, and as such if you're not grounded well, could cause more than a hot spot, that in itself is a good idea not to use it.
sharon1
Active Member
This post right here, should have ended this thread, lol.Take any series of calculus courses and you will actually learn why you are wrong. It's all based on parabolic curves, and their ability to concentrate light energy. This is actually the foundation of the invention of the telescope.... The chances of creating this condition accidentally are small, but that's not to say it's an 'old wives tale'. It's a mathematical fact, and the foundation for many applications you use every day (for instance if you are using a reflector on your light, chances are it is a parabolic design who's shape is based on the math behind focus points of parabolas)
Great post. ( I tried to give you +R for it, but the damn screen pops up behind the post below it. Can't seem to move it and I can't click on anything)
freddiemoney
Well-Known Member
Actually, a PPM isn't even a real measurement. EC is what you are measuring. Different meter manufacturers decide what a "PPM" should be using their products.
eg. 1.0 EC=500 ppm or 1.0 EC=700 ppm. Quite the difference in the same reading...I guess the wooden ship joke wasn't as witty as you had hoped it would be...
T0key
Active Member
Serapis
Well-Known Member
The worst advice I have seen yet:
The poster had a roll of 6" insulated duct and wanted to know if it was ok to use it because the sheathing was black. Lo and behold, a reply post from some noob with less than 4 weeks in RIU posted he should paint the sheathing on the duct white for better light reflectivity. Now I don't know about a lot of physics and stuff, but seems to me the light ducting is at hood height and is suspended around them parts to keep from blocking light. I doubt any light that bounces off of walls or floor would hit that duct at a precise McGyver angle to direct it back to plants, let alone the light has dissipated by that point.
I felt the need to fully explain my reasoning for calling out his poor advice before some poor noob replies back that white paint on duct is a great idea that will double your harvest. ;p
The poster had a roll of 6" insulated duct and wanted to know if it was ok to use it because the sheathing was black. Lo and behold, a reply post from some noob with less than 4 weeks in RIU posted he should paint the sheathing on the duct white for better light reflectivity. Now I don't know about a lot of physics and stuff, but seems to me the light ducting is at hood height and is suspended around them parts to keep from blocking light. I doubt any light that bounces off of walls or floor would hit that duct at a precise McGyver angle to direct it back to plants, let alone the light has dissipated by that point.
I felt the need to fully explain my reasoning for calling out his poor advice before some poor noob replies back that white paint on duct is a great idea that will double your harvest. ;p
I'm by no means a math professor (I'm in CS, just dabble in math), so I would easily defer to your experience. Not going to attempt a proof, but there's a proof of at least a part of this in var-pur-rig calculus with diff equations, 9th edition, page 511. Not precisely geared toward this because they are proving the optical property of the focal point, but this can be morphed toward what I was talking about...
anyway, I agree with you, the odds seem very remote (something I stated several times), but that's different than saying it's impossible.
In a way you are kinda making my point. The odds are remote, but they exist, and given enough trials, it certainly can happen (I honestly have no idea of even the ballpark chances that you could create this, since there is no way I'm going to try to work the math on exactly what it would take given an energy source and proper shapes). I also pointed out that given the likelihood of creating such a situation, worrying about it is silly. Kinda like worrying about a meteorite hitting our earth and ending our lives, quite possible, but rather unlikely during any one persons lifetime.