Knore

ofcourse there will be ALOT of differences because of the differences in light spectrum and main colors

you will get a basic guide of which is better but -

like what has already been stated:

i have and im sure you have... - grown 5-6 of the same strain and noticed that few if any, look the same and grow the same.
Ive often thought theyd mixed up the seed strains because some were so different - and all of this is to genetics

overall the expirement will give a basic guide

but if you can do it with clones by all means give it a go.

padmakara

Noting the differences exhibited in clones taken from the same mother, how can we hope to get a controlled experiment using them? Maybe if someone took the two sister branches (make sense?) from the plant?
All I know is that clones from the same mother can be spindly while others are bushy and just plain beautiful. Now, I've heard why on here as far as growth hormone distribution, but are there other major variables?
just thinkin about the future of controlled experiments.
thx

JoseHempSeed

ok, now that we all pretty much agree this isn't a :: pffffft :: rigorous, scientific :: cough, cough :: experiment, let's move on...

the plant are all settled in and looking pretty healthy this morning. i moved the lights down to about 12 inches, resulting in pretty even lighting of about 5.5k lu/ft² over both sides.

i measured them too, the mean height is 6.25 cm for each side. so it's pretty well-balanced, to start. all the plants have four leaves each (not counting cotyledons). they really do look remarkably identical.

and for the more technically inclined: over the entire population, µ=6.22 and ó=0.97, max=8 and min=5. they fit a normal distribution very nicely, i'm looking forward to some good results

JoseHempSeed

ok, the first week is over - and there doesn't seem to be any real difference (yet?)

here's the data, average for the groups:

_______Growth______Foliage
_______(cm/day)____(leaves/day)

MH______0.7_________0.5
Hortilux__0.8__________0.5

the 0.1 cm/day difference is not significant since my precision of measurement is only 0.5 cm.

i was surprised to see how closely the groups are growing...maybe this coming week will show some differences...

KarmasPayment

SOLUTION: Why not just grow 2 plants under each light. When doing a study the more tests and subjects you have the less there is a chance for error. Then you are just growing 4 plants and there is less room for error. Just a possibility, then you could try going from seeds.

Sounds like a good experiment, good luck.

KP

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SledgeHammer

Thankyou Jose! I have wanted to experiment with lighting, but because of the constraints of my grow and budget, it is not feasible. We cannot only mimic, but OPTIMIZE Mother Nature in every aspect of our grow except for the Sun. This is the true variable. Forget our personal grows, no modern farmer is without nutes and genectically engineered plants. Perfection of nutes rarely found in nature, CO2 enrichment, etc. We humans can do better than the conditions of nature, except for one thing - the Sun.

I am facinated by spectrum analyisis, intensity, etc., and how we can best mimic the Sun indoors.

Clones. Blah, blah, blah. Yes, identicle genes, but every clone is different. Clones from the same genes, if taken en masse, will show different means of growth. That is why I, and others, take more clones than we will flower and select the most compatible and healthiest ones. As far as one sibling being a foot taller, well, sure. But, if you take 8 siblings as Jose has done, there will be obvious, recognizable, common similarities, from growth rates to resistance or suceptibility to desease. Two words : Standard Deviation.

If Jose was using this research as a means to a Doctoral Thesis, I would demand much more stringent controls than have been suggested here so far. But he is not.

Jose, you seem to have knowledge of mathematical tools that take into account what you are doing, and Iam satisfied with your controls.

Please continue with the study. I eargerly await the results.

Peace.

JoseHempSeed

Gracias for the encouraging words, Sledgehammer.

I agree - the best we can do as indoor farmers is try and mimic the Sun. El Sol is by far the absolute best lighting source, and I prefer it hands down, anytime.

But it's pretty tough to try and figure out the exact qualities of sunlight that we want. Which is more important - the spectrum - or - the intensity? I strongly suspect the intensity is much more important than spectrum, maybe the experiment can shed some light (pun intended) on this.

And I only wish I had more room, more electricity, more lights! Could you imagine the experiment then? A population of hundreds! A statistically perfect analysis! But alas, a 400 W hps is only good for about four plants, so that sets the limit on the experiment's size...

Right on about the cloning. I have LOTS of questions regarding cloning, since there is such a tremendous variability between clones of the same plant. Just look at some of the weird clone photos that have been posted - they look more like mutants than clones!
I've certainly never had much success with identical clones. Not with hemp, chilies, or house plants. About the only thing they ever have in common is sex. They can grow at widely differing rates and many times even look entirely different.
It's interesting to note that only hemp cultivators call them 'clones'. Most other gardeners call them 'cuttings'...and I think I know why

And so the experiment continues...there's been a nice little growth spurt over the past couple of days...the little ones are looking healthy...

billybud

hi, neat science project, what kind of reflectors are those
thanx

JoseHempSeed

yeah! that's it! a science project!

anybody want to take this one to school?

anyway, they're the standard sylvania 'parking lot' reflectors for hid's. they are roughly cylindrical parabolics, they work pretty good.

JoseHempSeed

still no clear winner, although the mh lamp is showing a slight advantage in both growth rate and foliage development. the growth rate has picked up over the last week for both groups.

here's the data for this week, average for the groups:

_______Growth______Foliage________Nodes
_______(cm/day)____(leaves/day)___(average)

MH______1.0_________2.4__________11.5
Hortilux__0.7__________1.9_________10.5

i've also decided to count nodes from here on out instead of leaves. the leaves are growing so fast, and there are so many small ones, it's difficult to accurately count them. besides, there looks like a pretty good correlation between nodes and leaves. counting nodes is a whole lot easier and a whole lot more accurate.