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I think you have read different papers from myself:-)

Hey @FatManatee I'd say this is the best controlled trial I have seen on any forum yet re defoliation verse control. What you should do is a summary of the trial re substrate type, genetics, nutrient regime, light wattage/type, flowering period from start to finish, level of defoliation and...

Nice work man

ratio [ˈreɪʃɪəʊ] NOUN the quantitative relation between two amounts showing the number of times one value contains or is contained within the other. Same in chemistry my man.. I think what is happening here is people don't quite understand what a ratio is... We've also gone over that it would...

No what I am saying there is to try to keep humidity lower in flower due to the risk of fungal pathogens. The main thing with CO2 is the plant will use it if the stomata are open. That creates quite a wide range re RH.

No, where did I say that?? As long as the stomata are open the plant absorbs CO2

No that is only correct in the US. The standard in Europe is 1 EC = 640 ppm and in other countries (e.g. Australia) 700 ppm. I do consults with US growers BTW and recently I had a client say X ppm. I then said well the standard in the US is 500 ppm but could you check the conversion factor on...

Lol yup... mls per gallon is about as daft as it gets... And ppm is all wrong also. All ppm meters measure EC and then run a conversion program to convert to ppm. And there is no universal standard so is 1 EC 500 ppm or is it 640 ppm etc?

"You are talking dosage. I am talking pounds per acre, which is what NPK represents." Nope NPK represents NPK (Nitrogen, Phosphorous, Potassium). And nope, no hydroponic grower talks in pounds per acre so I expect you are applying completely the wrong units of measurement for this forum. Only...

Yes I do remember him. Didn't always agree with his information but 1150, 1200 ppm. Either way is just fine.

Yep with CO2 you want your controller to have full control so you can set any ppm. Also you want it with a sniffer so it automatically regasses to your desired CO2 ppm optimum that you set. If you are in a fully enclosed environment those figures sound okay although really in stretch and in the...

Yeah I haver always found most genetics max out at 1150 ppm. After that there doesn't seem any benefits in giving them more CO2.

Yes sorry in a sealed room where you can't exhaust air you need to keep CO2 injection happening although I think you'd find 400 - 500 ppm would suffice. A lot of CO2 rooms are also vented using baffles on fans to create seals so that gives the grower the option to vent also or run an entirely...

Its been answered - read over the posts. Ratios versus percentages and while you could round down a ratio this would downgrade the actual concentration which is measured by percentage. Thus it would be unwise for a manufacturer to round down because it would make a fertiliser look less...

Yes also on the point of this thread I would absolutely recommend that you didn't elevate CO2 in the last two weeks. Its simply a waste of quite costly gas. I.e. the rate of photosynthesis/cell division in the last two weeks is about nil so giving the plants more CO2 which is assimilated in...

Yes its not desirable to promote high rates of growth when the plant stretches because the aim is to reduce stretch and not to encourage it.

Hey mate I don't see it as arguing or it certainly shouldn't be - it's in the interests of education to pick up on information which could lead growers to less than ideal practices. Plant science/physiology is extremely complex and often people pick up on one thing without understanding there...

Ah I see you've sort of oversimplified or not quite understood. Rubisco also processes oxygen in photorespiration - at higher temperatures photorespiration (which is wasted energy in photosynthesis) increases while the processing of CO2 by rubisco decreases. And yes I know all about the dark...

Is there an issue with the scroll? If so I will need to look at that. Cheers for the heads up

Temperature is absolutely critical in the light dependent reactions because temperature affects the ability of rubisco to catalyse CO2. In fact the most important factor in this process is by far temperature.