Fans for stem strength

Anjinsan

Anjinsan

Well-Known Member
How about the Oxford Journals?

http://jxb.oxfordjournals.org/cgi/content/full/54/383/845

*crickets*

Many studies have shown that wind affects plant development, causing them to develop shorter and usually stronger stems. Many of these effects have been shown to be due to a response to mechanical flexing of the stem which is known as thigmomorphogenesis. However, it is not known how wind affects the hydraulic properties of stems, nor have the effects of air flow past leaves been examined in isolation from mechanical flexing. This study, therefore, used a factorial experiment to distinguish between the effects of stem flexing and air flow, and examined the morphology, hydraulics and mechanics of developing sunflowers Helianthus annuus. It was found that flexure and air flow had opposite effects on several aspects of development; air flow increased plant height and length-specific stem hydraulic conductivity, kh, and reduced stem rigidity and strength, while flexing did the reverse. There was also a clear trade-off between hydraulic and mechanical capability: as one increased the other decreased. A plant’s response to wind must, therefore, be a complex response to at least two different stimuli and this might help explain why it varies with species and environment.
 
StaySmokin206

StaySmokin206

Active Member
NirvAnamation said:
How strong should the fan be?

Should the plant be obviously pushed by the wind?
Barely be affected by the wind?
or no obvious movement at all?
Click to expand...
As you can see Nirv, everybody has their own opinions/theories to believe about what it does for your plant, yet most everyone will tell you to use a fan, just not during seedling imo.
 
JN811

JN811

Well-Known Member
thats fine but i really dont think YOU READ THIS :lol: cause it doesnt support your point...it supports mine.. read :lol:
However, it is not known how wind affects the hydraulic properties of stems, nor have the effects of air flow past leaves been examined in isolation from mechanical flexing.

Results:
No significant two-way interaction between wind and flexing was observed. Neither stem diameter nor leaf area was significantly affected by the treatments.
 
JN811

JN811

Well-Known Member
There was no clear visible difference in stem anatomy, but the relatively small changes in conductivity and mechanical properties that were observed would only require very moderate alterations. A small increase in the number of fibres or an increase in the thickness of their cell walls would be enough to strengthen the stem. Similarly, a small increase in the number of vessels or in vessel diameter would be enough to increase stem conductance, particularly as the conductivity of vessels increases with the fourth power of their diameter.
 
JN811

JN811

Well-Known Member
all i know is im gonna harvest 2lbs off 8 plants with no stem stregthening :) and my stems are completely healthy and Ive had 0 stem issues.. thus its unneeded
 
JN811

JN811

Well-Known Member
dude.. read the study.. seriously. dont just post shit that contradicts yourself.. Its like a procecuter presenting evidence that frees the defendant... LOL
 
JN811

JN811

Well-Known Member
lol LMFAO that study is completely irrelavent!!! omg copying and pasting articles doesnt make u smart... LOL wanna compare grows??
 
JN811

JN811

Well-Known Member
Anjinsan said:
I did read it. Wind effects stems. Y/N?
Click to expand...
There was no clear visible difference in stem anatomy, but the relatively small changes in conductivity and mechanical properties that were observed would only require very moderate alterations. A small increase in the number of fibres or an increase in the thickness of their cell walls would be enough to strengthen the stem. Similarly, a small increase in the number of vessels or in vessel diameter would be enough to increase stem conductance, particularly as the conductivity of vessels increases with the fourth power of their diameter
then tell me what this says


NOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
 
JN811

JN811

Well-Known Member
omg this is an ABSTRACT lol its is NOT the results of the study.. the study found LITTLE to NO correlation between stem strengthening from wind..
Anjinsan said:
How about the Oxford Journals?

http://jxb.oxfordjournals.org/cgi/content/full/54/383/845

*crickets*

Many studies have shown that wind affects plant development, causing them to develop shorter and usually stronger stems. Many of these effects have been shown to be due to a response to mechanical flexing of the stem which is known as thigmomorphogenesis. However, it is not known how wind affects the hydraulic properties of stems, nor have the effects of air flow past leaves been examined in isolation from mechanical flexing. This study, therefore, used a factorial experiment to distinguish between the effects of stem flexing and air flow, and examined the morphology, hydraulics and mechanics of developing sunflowers Helianthus annuus. It was found that flexure and air flow had opposite effects on several aspects of development; air flow increased plant height and length-specific stem hydraulic conductivity, kh, and reduced stem rigidity and strength, while flexing did the reverse. There was also a clear trade-off between hydraulic and mechanical capability: as one increased the other decreased. A plant’s response to wind must, therefore, be a complex response to at least two different stimuli and this might help explain why it varies with species and environment.
Click to expand...
 
Anjinsan

Anjinsan

Well-Known Member
You are wroooooooooooooooooooooooooooooooooooooooooooooong. But you know what? Now they can look for themselves.
 
Anjinsan

Anjinsan

Well-Known Member
JN811 said:
thats fine but i really dont think YOU READ THIS :lol: cause it doesnt support your point...it supports mine.. read :lol:
However, it is not known how wind affects the hydraulic properties of stems, nor have the effects of air flow past leaves been examined in isolation from mechanical flexing.

Results:
No significant two-way interaction between wind and flexing was observed. Neither stem diameter nor leaf area was significantly affected by the treatments.
Click to expand...
Do you know to what they are referring to with hydraulic? It is not stem strength as we were discussing.

Many studies have shown that wind affects plant development, causing them to develop shorter and usually stronger stems. Many of these effects have been shown to be due to a response to mechanical flexing of the stem which is known as thigmomorphogenesis. However, it is not known how wind affects the hydraulic properties of stems,

Two different things.
 
JN811

JN811

Well-Known Member
LMFAO i really dont think u understand how a study works.. Im in a research class and we just conducted research proposals... You are quoting information found in the ABSTRACT which is not the actual study, it is the selling point of the study, to get FUNDING!!!. If you read the RESULTS and DISCUSSION section you will see the found VERY LITTLE significance of wind effecting stem strength which is what we are debating over!!!!
 
JN811

JN811

Well-Known Member
all i gotta say, is without wind my stems are WAY bigger than yours, not knocking you, it looks good, but look at mine ;) go to the Fab 5
 
Anjinsan

Anjinsan

Well-Known Member
So thigmomorphogenesis does not exist? Wind has no effect on a plant's stem is your fact? Plants in a greenhouse are as strong stemmed as plants in the outdoors?
 
P

Promitius

Well-Known Member
JN811 said:
URBAN LEGEND.... wind does NOT strengthen stems...
Click to expand...
i disagree. and you shouldn't make claims like that without backing them up with some science.

while you did get a good yield from your plant they may have been due to other circumstances such as genetics and nutes...
 
Anjinsan

Anjinsan

Well-Known Member
Gee what a surprise you are using 400 hps...i got 2 ounces off of one plant using about 200 watts of cfl.

 
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