[MDS]

It's worth reading the whole book, @Budgie

The little 'wind speed' graph on that same page is interesting and suggests that any internal circulation (oscillating fans) should ideally produce an air speed of 0.2 m/s to 0.5 m/s for optimum growth.

 

Just out of interest did it happen to mention what plants they were using to get these results?

 

I see the tests were conducted in the good ol US of A, so I'm assuming they weren't being tested on cannabis
 

[Budgie]

Tomatoes and two other species@ MDS erm legumes and clover praps. I only scanned through earlier

[MDS]

Tomatoes and two other species@ MDS erm legumes and clover praps. I only scanned through earlier

 

Cheers @Budgie , not quite what we were all hoping for then really But kind of what I was expecting

 

Still it might well be useful for growing the above How much would translate over to canna is totally unknown & only guesses could be made at this point in time.
 

[Anonymiss]

Just out of interest did it happen to mention what plants they were using to get these results?
 
I see the tests were conducted in the good ol US of A, so I'm assuming they weren't being tested on cannabis

 

Cheers @Budgie , not quite what we were all hoping for then really But kind of what I was expecting
 
Still it might well be useful for growing the above How much would translate over to canna is totally unknown & only guesses could be made at this point in time.

Do you think that cannabis behaves especially differently and has unique requirements, in comparison with other plants?

I don't

I'm pretty sure that the basics of plant growth are fairly universal between species and that what works in one will generally work with others.

Sure, there will be variations within the boundary conditions and exceptions to the rules, but when it comes to stuff like photosynthesis, radiation, carbon dioxide, air movement, etc. it's all pretty much the same.

[MDS]

 

Do you think that cannabis behaves especially differently and has special requirements compared to other plants?

I don't

I'm pretty sure that the basics of plant growth are fairly universal between species and that what works in one will generally work with others.

Sure, there will be variations within the boundary conditions and exceptions to the rules, but when it comes to stuff like photosynthesis, radiation, carbon dioxide, air movement, etc. it's all pretty much the same.

 

Yes actually I do Missy, I mean as a for instance I think there might just be one other plant other than cannabis that actually expresses separate male & female individuals I'd say that's damn near a unique trait if only (possibly) one other does it 

 

I'm pleased you said generally, because all the grow shops seem to stock PK13/14 which was developed for fruiting plants, not cannabis   If you want canna specific nutes you need to look to Advanced Nutrients (Canada) & their equivalent is PK09/18 (hammerhead).

 

I think you may well be forgetting where most of this stuff originated, in fairly mountainous areas near the equator (Ruderalis excepted), where it gets loads of light but the air is cooler It also would have to be used to more UV radiation than just about any plant grown agriculturally on a nice flat field.

 

So yes I think the stuff is different, however if you'd like to continue thinking it's all very nearly the same I'm afraid we'll just have to agree to differ

 

 

[Anonymiss]

And rather than add to the above, @ MDS , I reckon that within the context of this discussion (air replenishment/movement within sealed growth chambers), the discussions and observations made in the Handbook regarding how conditions differ above compared to beneath a canopy, temperature gradients, etc. are true of most anywhere, let alone being specific to a particular plant species.

Read it, then comment on what it contains

[Anonymiss]

Yes actually I do Missy, I mean as a for instance I think there might just be one other plant other than cannabis that actually expresses separate male & female individuals I'd say that's damn near a unique trait if only (possibly) one other does it 
 
I'm pleased you said generally, because all the grow shops seem to stock PK13/14 which was developed for fruiting plants, not cannabis   If you want canna specific nutes you need to look to Advanced Nutrients (Canada) & their equivalent is PK09/18 (hammerhead).
 
I think you may well be forgetting where most of this stuff originated, in fairly mountainous areas near the equator (Ruderalis excepted), where it gets loads of light but the air is cooler It also would have to be used to more UV radiation than just about any plant grown agriculturally on a nice flat field.
 
So yes I think the stuff is different, however if you'd like to continue thinking it's all very nearly the same I'm afraid we'll just have to agree to differ

 
Yes, there are variations, but just how different is it to all the other plants that grow in those conditions?

Not very, I'd say.

Does it carry out some special form of photosynthesis which no other plant performs?

Does it have unique carbon dioxide requirements?

How about light intensity and spectrum?

Do you think its cells behave differently when bent or handled, compared to other plants?

It's basic O-Level biology I'm talking about, not specifics and details like micro-nutrients or feeding regimes, or how long the dark period should be.

[MDS]

And rather than add to the above, @ MDS , I reckon that within the context of this discussion (air replenishment/movement within in sealed growth chambers), the discussions and observations made in the Handbook regarding how conditions differ above compared to beneath a canopy, temperature gradients, etc. are true of most anywhere, let alone being specific to a particular plant species.

Read it, then comment on what it contains

 

I see I have instructions

 

Very well, I downloaded the lot earlier so given time I'll have a read

 

I just hope nobody else comments until they have also read it as otherwise it wouldn't be fair, now would it
 

[CocoMonkey]

I dunno if it would make any difference if the airflow and the temperature is stable. I tell you what tho budgie it does give me an idea when winter sets in, extract from the bottom and use that heat to help keep the temps up, I think it would work well with a fan speed controller

Edited by CocoMonkey, 08 August 2016 - 07:56 PM.

[Anonymiss]

I see I have instructions
 
Very well, I downloaded the lot earlier so given time I'll have a read
 
I just hope nobody else comments until they have also read it as otherwise it wouldn't be fair, now would it

 
I'm just not sure that commenting on something which one hasn't read is fair

Don't forget that the only relevant part here is page 7 of chapter 6
 

I'm pleased you said generally, because all the grow shops seem to stock PK13/14 which was developed for fruiting plants, not cannabis If you want canna specific nutes you need to look to Advanced Nutrients (Canada) & their equivalent is PK09/18 (hammerhead).

But you have shown that your own mix of Miracle Grow with added calcium/trace elements is absolutely fine and produces good results, yet they were developed for garden plants and are almost certainly not aimed at cannabis.

Me, I use Phostrogen or Chempak and I have no complaints about them (even in a hydro medium such as coco), nor do I worry that they might not work with cannabis because they were designed for potatoes, tomaotoes, and lawns (etc.)