Hey rebel dawg, you might wanna check back a page for a minute, his system isn't set up exactly like how it appears..



here's one of the things you said in my thread about going to 12/12 early


That's what I was getting at here, 12/12 early =less bud =less size, if NScooknet went to 12/12 a little early, it might help keep the overall size down a little, (despite having to go for more days at 12/12.) Again, I wouldn't be bringing this up except for the fact that these are seedlings, not clones, and have that additional time requirement.

But I'm not necessarily advocating this, or saying that I would do it, I'm just throwing it out there as a possibility because it's something we talked about before, and it might help.

I don't know what his plant spacing actually is, but I think your suggestion of only using every other hole is probably a good idea. But I bet he's not going to be happy about taking any of his little plants out. Lol.

NScooknet, I probably shouldn't say this, but if I was there and I knew you in person, I'd bet you a thousand bucks that if you took each of those sprayer air lines and connected them to a 10 or 14" airstone, or whatever length airstone would cover the entire length along the bottom inside the 4" tubes, and then connected that to a decent air pump, like my hakko hk40, you wouldn't get root rot, even into the low 80s... :-)

And that pump and airstones would cost less intitally, and considerably less electrically to run than a chiller..

Edit: Yes, this would be an experiment, and I'm again not advocating that you do this. I'm just putting it out there.

If you have an old window ac unit, you can make a good chiller out of it, I have an old thread about how I did that here in the hydro section. Definitely not for everyone though.

So are we talking 100% that if my nute solution is not kept below 70 degrees that my roots will rot for sure and all my plants will die at the flowering stage, or are we talking a not ideal situation which may effect the health and yield of my plants??

All I can say with 100% certainty is the temperature requirement is significantly affected by aeration. I've never ran NFT or recirculating dwc, but I have ran aero (once the tubes have roots in them there's always a layer of water in there, so I think of it partially as NFT) and I currently run DWC, in tubs. I experimented with temp in aero, and found the best results at 62F. In DWC, right now my veg tubs are at about 82, without problems. My flowering DWC tubs are typically about 76F.

But this shit is complex! There are a ton of variables that affect it all, and a ton of experiments that could be/should be done, and maybe have been, but you're not going to be able to find them online without effort. For example, I never ran my aero sprayer pump continuously, and then experimented with temp on top of that. It might actually be the case that if you run the sprayers continuously, you don't need to chill it. I don't know. I also don't know the effects of the constantly moving solution in your tubes on the temp requirement either. I've seen grows on youtube (heath robinson vertical grow, for one) where they're circulating a solution of significant depth in the tube, or series of tubes, without airstones in the tubes, but they didn't say what the water temp was, or if they ran a chiller.

I ran aero units for many years (am doing dwc now though)and experimented all kinds of ways as I lived in Las Vegas and it was 125f outside on a typical August afternoon. In that environment I was only able to get my grow room down to 85f and ran my pumps 24/7 and had a chiller on the rez and was able to attain 66f in the rez and 69f in the tubes (I had 6"tubes though). The reason I share that is to say this, one must experiment and play with it to find perfection. Bottom line though is that once water gets above 72f it begins to hold less oxygen and thus needs more input of oxygen. I have run dwc units at 85f with high aeration and not had root rot, but have also had an aeroflo60 that I lost an entire crop to root rot and it was only at 73f.

So I guess the "quick answer" is that your not too sure what might happen...lol.

I know, there's no solid rules, and it depends alot on all those variables, but I just wanted to know if I was attempting something that was just going to end up with heartache and no yield for sure.

I'm actually starting to wonder if I should have planted in soil in pots.

I'm hoping the extra electricity spent in running the hydro will result in a better yield and it will be worth spending the extra money for as opposed to just growing them in pots.

They seem to be growing well so far, every day I see a difference in them.

I had hoped to have all identical size plants growing all at once, but for some reason the seeds I received from the seed bank are not even splitting when soaked, while others just took off like crazy, so I keep having to germinate more seeds which don't all sprout, and repeat the process until I have about 4 different stages of growth in my hydro setup over the past 2 weeks, geesh.

This 15 plant limit thing is kinda pissing me off, if I didn't have that limit, I would have planted 30 or more seeds and then culled out 15 of the best ones that actually sprouted.

Live and learn!

I have to agree with Harvey because I've seen him write over the years that he believes his DWC can run higher temps because he has lots of bubbles creating air and since 71 or so like Rebel mentioned is where the oxygen starts to get depleted due to water temp so.... I'm thinking you either try out something like Harvey mentioned in the tubes for increasing the air, a chiller which isn't cheap or plan to experiment and hopefully you don't lose a crop but best of luck and if you don't plan on adding more air I would certainly think you will find some brown root rot in your reservoir one day but keep us posted either way.

Thanks for that info.

I have another question while I have your attention, what causes a seedling to suddenly have a bit of leaf curl??

Is this a nutrient issue?

One would think if it was that all the plants would do the same, but only 2 out of 10 plants are doing it, and they are both different strains.

Is it anything to worry about??

See pics below:


Here is a curled one:



And here is one in the same hydro system that the rest look like:

Why is this thread all fucked up now? I can't read it!

Hmm....working now....weird....