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You really need a co2 meter. The variables are just too significant. The size/stage of the plants during the grow and all the variables that affect plant metabolism, like temperature, also affect co2 usage. Room leakage is constant, but not between different grow rooms. It would be easier to hit...

Nice to see you guys think it is basically a sound idea. I didn't know Colorado State University was growing cannabis, that's interesting. But I think a lot of the people who are interested in growing may not be at that place in their life anymore. ie, not 22 years old anymore. Haha. So I think...

Greetings, anyone reading this. This is something I've had floating around in my head for a while, the idea of teaching at some kind of hydroponic school. I haven't found too many of them out there. I have found a few schools, but it seems like most of them are low tech, ie, "organic soil", etc...

What I'm wondering about here is cannabis laws changing the demographics of the society they apply to. I'm trying to figure out the effect Colorado's new laws are going to have as far as who's there, property values, etc. I think the property values will go up a little, as CO just became a more...

The irony of this is once you wish it would happen, it never will. I've only had people try to pick fights with me when I was in a good mood, never wanting to fight. When I'm in one of those moods where I'm hoping someone wants to start something, no one ever does. And the irony of that is I can...

You do realize that you yourself can learn how to wire rooms, houses, etc, right? Electrical theory is not that complex, as long as you're not diving into what electricity actually is, and how voltage correlates to the orbit of valence electrons, nerding out on that level. Haha. I am more...

I would just say you have to experiment. That's what I always say about questions of this nature. I have no idea about what kinddiesel is doing, with such a high ppm of co2. That is so far past anything I've done, it's like it's from another planet, with another type of plant. I achieved my...

I started and contributed to a long, very nerdish thread about uvb on another forum, that basically culminated in me saying I should start a company with a friend manufacturing UVB LED lighting, but we never did it. Lol. so I'll just stick to more conventional tips for this post. There are a...

I do not keep mother plants, so I always takes clones from flowering plants, done this for years. Along the way, I did a lot of experimentation as to the best way to do it, so I can tell you from experience, don't get your hopes up with clones taken in late flowering, especially at harvest. I...

I would never use rockwool, since I like to see the condition of the stalk and the root nubs start to form. DWC or "aero" sprayers, you don't even need gel or hormones. PH correcting RO water, no. PH is a function of what's dissolved in the water, ie, the tds. RO water has nothing in it. So...

Sometimes rookies think they can add co2 with a tank, regulator, and only some stupid formula, with any kind of legitimacy. You cannot do that. You need a controller, like this http://www.titancontrols.net/products/co2-devices/atlas-1.aspx Sometimes you will find that if you grow in a living...

It frustrates the living hell out of me when I come across threads talking about gram per watt, that number is absolutely meaningless. I've convinced people on other forums to calculate their efficiency with the true measure, grams per kilowatt hour, but I don't think I'm going to get anywhere...

Thanks for the replies. I also have another question I have been unable to answer so far. Is it legal to buy from a retail store and then turn around and sell that to someone else? Or is that illegal because they're not getting their "cut" of that transaction also? I know it's legal to give it...

I thought it was common knowledge by now that you can basically leave green CFLs on the entire lights off period with no adverse affect..

Sorry if I'm supposed to already know this, being part of the cannabis community, but I must have missed the memo on this one, because I have no idea! I've looked on the gov site, and the info is outdated/not specific to the new recreational laws. And all the other searches I've done so far have...

Well, how do you think they'd respond if instead of adding RO water only, every few days add water and a calculated amount of nutes? It is a little more work that way though. That's what I do. Solution level drops, then I add RO water, measure tds, then calculate what to add to attain my target...

I just want to make a couple comments here. In general, hydro growth rates are considerably higher than soil, provided you have the rest of the environment dialed in. Light, co2, RH, air movement, and temp. My other comment is to you guys talking about grams per watt. You could have 2 crops...

In my experience, the biggest thing that affects density, once everything is optimized, is temperature. Trichome production, it is light. Specifically, light that is not monochromatic, and has some uvb. Yield, it's co2 + light + temp + RH + air movement. You're trying to achieve the best...

I am confused here. So your tds went higher, and you observed an increase in size/frostiness greater than expected, so then you want to experiment by doing the exact opposite, 3-4 days or RO water only? p.s. What is your conversion factor to ppm from EC? I don't think my meter even reads over...

it occurred to me after I made this that it would probably also work, (or a similar variation of it would) for manicuring dry buds. Might need a little more coarse of a screen, but I will absolutely try that. I hate using scissors, it's such slow, tedious work.