Which would produce more DO in a DWC?

[JSB99]

This is from my inside/outside plant. 8.3oz/235gr dry

I have the sativa Headband strain, which is a low yielder. I didn't know that when I got the clone. If I had spent some time on her, I might have been able to double the yield. I've got some GSC, Blue Dream, and Grape Ape beans coming, so next year my outside grows should be much more substantial. Also plan on getting SSH seeds, and I'll plant one of each, in 10-gallon Smart Pots, in my back yard next year.

I've got to get me a few cases of 64oz Ball Jars!

 

[JSB99]

Dropped the hood closer to the tops, and lost some of the footprint. So I added some supplemental lights in the corners.

 

[XipXipXoom]

Gaseous oxygen is of no use to roots?

That's correct. Same way it's of no use to fish. Plants and fish breathe aqueous oxygen. The O2 in dirt has to first be dissolved into the water in the dirt, from the air in the dirt. Thats why you have to let dirt dry out between waterings but DWC roots can stay wet all the time.

And why is it relevant?

You can't have a discussion about oxygen respiration without including carbon dioxide.

Root respiration usually accounts for approximately half of all soil respiration. However, these values can range from 10–90% depending on the dominate plant types in an ecosystem and conditions under which the plants are subjected.

In DWC 90%+ is coming from the roots. Taking CO2 away is just as important as delivering oxygen, but rarely discussed. A lot of nurses crank patients oxygen up without thinking about that. Just thinking that more is better.

 

[ttystikk]

You can't have a discussion about oxygen respiration without including carbon dioxide.

When discussing oxygen availability at the root zone, yes we can. There's no photosynthesis going on, so no carbon dioxide.

 

[vilify]

On the original topic. I just replaced 3 x 80 l/min Atila air pumps and 1 x EcoPlus Commerical 7, with a single blower for a spa/hot tub and I have more aeration. Split between 2 x 24 site 13 gallon RDWC systems. Interested to see the longevity as the blower cost <$100 and replaced about $600 in equipment.

Can't post pictures atm.

 

[XipXipXoom]

When discussing oxygen availability at the root zone, yes we can. There's no photosynthesis going on, so no carbon dioxide.

That's only true at night.

 

[ttystikk]

That's only true at night.

Perhaps, but you're missing the point. Unlike oxygen, there's no minimum required amount of CO2 in the substrate. The plants don't need it at the root zone to grow.

 

[JSB99]

On the original topic. I just replaced 3 x 80 l/min Atila air pumps and 1 x EcoPlus Commerical 7, with a single blower for a spa/hot tub and I have more aeration. Split between 2 x 24 site 13 gallon RDWC systems. Interested to see the longevity as the blower cost <$100 and replaced about $600 in equipment.

Can't post pictures atm.

Damn! That rocks!!! Is that blower loud?

 

[vilify]

Damn! That rocks!!! Is that blower loud?

It's a lot louder than the atila(considering they're near silent) for sure units but not terrible. A simple box around the blower would silence it pretty well.

 

[dstroy]

That's correct. Same way it's of no use to fish. Plants and fish breathe aqueous oxygen. The O2 in dirt has to first be dissolved into the water in the dirt, from the air in the dirt. Thats why you have to let dirt dry out between waterings but DWC roots can stay wet all the time..

I'm assuming you meant dissolved oxygen, not aqueous oxygen. They're two separate things.

Actually, plants do use gaseous oxygen. It is easier for them to absorb dissolved oxygen, but they use the GASEOUS oxygen found in the spaces between soil particles. Which is why soil respiration is an important part of the cycle, because it replenishes gases. But it's not the whole picture, and it actually supports the opposite of your position.

You have to let the dirt dry because the plants use the dissolved oxygen in the water fairly quickly, and if the soil remains saturated all of the available oxygen is depleted.

Doesn't matter if it's a gas or dissolved.

http://scienceline.ucsb.edu/getkey.php?key=730

So you can take your uninformed, misguided opinions elsewhere. Do some research before you try and act like you know what you're talking about.

You can't take anecdotal evidence, and then represent it as scientific fact. That's unethical.

Your ASSUMPTIONS are WRONG.

 

[mytwhyt]

Fish that can breath air,

• Climbing Perch. ...
• Walking Catfish. ...
• Mudskippers
• Snakehead

 

[JSB99]

That's only true at night.

Quick question, do you grow? I'm really curious about that. If so, what method do you use?

 

[mytwhyt]

Not on riu lately, on 420 mostly, Waterfarms, Lucas formula, Flora Nova Bloom only... 12 and 14 oz finished.. Sorry thought that question was for me...

 

[Billy Liar]

A bit of food for thought on the bubble size discussion.

http://horttech.ashspublications.org/content/19/1/212.full

Peace
BL

 

[Anon Emaus]

Bud porn from my inside/outside girl. If I had known I was going to put her outside from the start, I would have done some things differently, that would have increased yield. But, I still got a pretty decent amount.

View attachment 4024741 View attachment 4024742 View attachment 4024744 View attachment 4024746

Beautiful buds man. Just curious, whats with the water jugs hanging on the lines?

 

[JSB99]

Beautiful buds man. Just curious, whats with the water jugs hanging on the lines?

Thx!

The jugs were to add tension to the lines so I could hang branches all the way across. That was just a temp setup though. Being an outside plant, I didn't want to hang them in my grow room, where I built a drying rack for indoor plants. She was bug-free, but you just never know what's lying dormant

This is the drying rack in my grow room. I'll probably add a pipe to the front to pull the first few lines tight.

 

[JSB99]

Got my 2ft, 4-lamp t5 today, for my mum's. I've got GSC, Blue Dream, and Grape Ape beans coming, but I can't plant anything until I get back from x-mas vaca. The universal guide on bonsai mums says to grow them from clones. I would've thought that mum's grown from seeds would be recommended over clones. Is there any difference? I know clones have offset shoots compared to them being even when grown from seed. Not sure if that makes any difference.



My bubble Cloner on the bottom. The wood rods keep the sides from bowing out when filled with water. I could've used a more durable tote, but for the space, this one fits really well. It'll work for now.


I had "winterized" the room by exhausting the hood air into the room, now that its cool, but I had a hard time regulating the heat build-up in the room. So I went back to my original setup.


Buds are coming along nicely! The buds under the CFLs have bulked up quite a bit! I've got the hood about 14" from the tops. Any closer and I lose too much coverage. I'd like to get a 1k and run it at 750, along with with a Blockbuster hood, to get the coverage I want without having to hang CFLs. Ultimately I plan on building a COB array that'll cover everything, but that's a little pricey, so I might do the 1k thing until I can afford it.

 

[JSB99]

Vaped a couple bags of new batch last night. I vape throughout the day, so I could only get a hint of the quality. Definitely gave me bump up! This morning, after my coffee, I vaped a bag. I got a strong, energetic stone! It's been curing for a week, so it's good enough to smoke, but it hasn't hit it's peak flavor yet. As a first time grower in a long time, and being a strain I've never grown before, I was a little worried about it not turning out great, at a time where I just can't afford to buy any more. Thankfully, this is really taking the aches and soreness away, and is a strong high without a hint of couch lock! Without bias, I'd say mine is as strong, if not stronger, than what I get from the pharm! They're a large-scale, licensed grower with a lot of big fields, so they probably grow more for bulk, and less for strains that may be more potent, but not big yielders. Headband is a low yielder, but I can tell it'll take less to get me where I need to be.




Wonder how my inside plants are going to compare. The buds are getting pretty plump, and I've got more than a month to go. It'll be a comparison between sun-grown in coco, and light-grown in an RDWC. I've got the TDS around 1k, and just barely burning the tips. So, as Scottie would say, "I'm giving her as she's got, Captain, but the crystals can't take much more!"

 

[XipXipXoom]

Perhaps, but you're missing the point. Unlike oxygen, there's no minimum required amount of CO2 in the substrate. The plants don't need it at the root zone to grow.

No minumum, but a maximum. If the substrate has high levels of co2, the roots will have a harder time expiring co2. This is why you don't run co2 at night. With no psii taking place, plants take in o2 through their stomata at night, and expire co2. Running co2 at night makes it harder for them to respire.

In the same way, high soil/dwc co2 levels make it harder for roots to respire. If your only running waterfalls in a co2 supp room, you could be raising your waters dissolved co2. An air pump pumping in air from a low Co2 room can help in that case. Not in raising oxygen, but in lowering co2, which will still allow roots to respire easier as well as reduce ph swings.

 

[ttystikk]

No minumum, but a maximum. If the substrate has high levels of co2, the roots will have a harder time expiring co2. This is why you don't run co2 at night. With no psii taking place, plants take in o2 through their stomata at night, and expire co2. Running co2 at night makes it harder for them to respire.

In the same way, high soil/dwc co2 levels make it harder for roots to respire. If your only running waterfalls in a co2 supp room, you could be raising your waters dissolved co2. An air pump pumping in air from a low Co2 room can help in that case. Not in raising oxygen, but in lowering co2, which will still allow roots to respire easier as well as reduce ph swings.

Except that the evidence- observed plant growth- doesn't bear this out.