I just know that excess N in flower gives you more foliage and less flower clusters. Potency and yield are affected negatively. People do very well growing in coir with straight Maxibloom (5-14-15) from start to finish.

Cannabis is not a heavy N crop in my mind. I've played around alot in DWC with different formulas and did very well growing with straight Dyna Gro Bloom (3-12-6) from start to finish without any signs of low N in either veg or flower.

I think in terms of the containers being individual reservoirs. I know DWC plants do exceptionally well with 1.0-1.2 EC max in flower and many need less than that. I try to replicate these values and keep them as constant as possible. That's why I feed slightly lower than targeted EC and pH in the medium.

There's a lot of interactions growing Cannabis. In early flower right after transplant there's no bacteria or no inoculations present in the medium to fixate the minerals, this takes a couple of weeks to happen. When I see EC adding up on the runoff I'm backing off on the input strength to try to reach and keep ~1.2 EC constant in the medium.

I think in terms of: Hydro! hydro! hydro! Lol!

Hope that makes any sense!

Cheers!
It does but want to have more of a think. I have this idea (and never really done DWC save a few hydroline things) but 1.2 EC in DWC is more like 1.6 or more in coco. You’re making foie gras in DWC 😅

Not anything I’ve read or anything, it just feels like that’s what’s going on.

I will re read when less mashup though!
 
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First runoff reading:

425ppm / 0.85 EC in, 575ppm / 1.15 EC out.

pH 6.1 in, pH 6.3 out.

That's slightly lower. They seem happy at 1.15-1.2 EC out.

Cheers!
 
It does but want to have more of a think. I have this idea (and never really done DWC save a few hydroline things) but 1.2 EC in DWC is more like 1.6 or more in coco. You’re making foie gras in DWC 😅

Not anything I’ve read or anything, it just feels like that’s what’s going on.

I will re read when less mashup though!
I posted it in earlier post but my old friend and mentor ran a Skunk cross for years at 0.65 EC in coir. Still to this day the best I've ever smoked.

All schedules and dosages you'll find are better suited for peat compared to coir. You need to have in the back of your mind that all nutrient manufacturers wants you to overfeed for profit and when you come back with deficiencies they want you to mask the lockouts with even more minerals and additives instead of sorting the main problem, overfeeding and pH being out of range.

You'll get away with more dry backs in Pro-mix and can feed slightly higher input because you're able to feed less often.

Coir asks for lower feed and more frequent. With your approach I think it's better to go with something like Rockwool that doesn't need feeding as often and no added Ca/Mg on top of the feed.
 
Third runoff reading:

425ppm / 0.85 EC in, 575ppm / 1.15 EC out.

pH 6.1 in, pH 6.3 out.

Identical from first runoff reading. Stable.

Cheers! :blunt:
 
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First runoff reading:

425ppm / 0.85 EC in, 480ppm / 0.96 EC out.

- I'm curious to see where they settle today on the runoff? First reading is always slightly lower since it's 6 hours since last feeding I stead of 3h. Still well within range at first reading and some are even showing signs of excess.

pH 6.2 in, pH 6.35 out.

I need to transplant more clones today and I assemble and install the second net.

Cheers!
 
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Day 25 from flip! First runoff reading:

425ppm / 0.85 EC in, 480ppm / 0.95 EC out.

pH 6.6 in, pH 6.8 out.

I've been away and haven't pH adjusted since filling up the new reservoir. Plants dont mind. It's way better to be closer to pH 7.0 compared to pH 5.5 in coir.

Cheers!
 
I've transplanted all cutting except #1, I will let her root but probably not keep her for the future. If the pheno is to hard to work with in this case rooting it has to go.

I'm most surprised by #4 (I believe?) that I called off early on. She's a very low feeder and early producer. Could be nice to run perpetually with very low EC.

I'll hola at @NickHardy when I receive my EC calibration solution. I'm eager to see how offset the EC pen is, I bet ~0.4 EC low.

I've been re-assembling and threading the second net and I'll install that soon. Now vape break!

Cheers!
 
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Second support net installed. Took some pictures from the other edge that's not accessible with the sides closed.

I've been lazy and busy setting up the net, maybe I'll take third runoff reading. They will grow through the net in the upcoming weeks. I can lower it if I need to.

Cheers!
 
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Calibrated the EC pen. Less than 0.1 EC offset in over ten years, that's pretty remarkable! Creds to HM! My newer Combo HM pen is way more off.

Not too off @NickHardy!

Cheers!
 
I thought ai’d mentioned today but got distracted clearly! I def said here or in my contest grow - EC I’m not so worried about calibration? As long as you keep the two metal diodes clean its just a resistance meter, right?
Yes they should keep calibrations for years, mine did for well over 10 years.

The new Combo meter I bought is however way off from the factory(it's the one I used when growing in Thailand). Almost 0.3 EC off, the older one (COM-80) is still pretty on point.

I'll calibrate all my new EC meters from now on since I can't trust "Calibrated from factory". Then calibrate EC yearly, pH weekly.
 
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Testing out the system camera. White balance is off.

First runoff reading:

451.5ppm / 0.93 EC in, 452ppm / 0.94 EC out.

pH 6.2 in, pH 6.2 out.

It's a little bit too humid in the tent so I lowered RH to ~65%.

I've been adjusting run time on the watering/feedings down to 15 seconds. I started at 25 seconds. Lower feed time with less runoff will give them more nutrients in the medium and less runoff to vacuum out.

Cheers!
 
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Day 29 since flip. First runoff reading:

0.9 EC in, 0.97 EC out.
- EC upward curve. Still showing signs of excess

pH 6.2 in, pH 6.2 out.
- Stable

I keep trying to dial in the system. The lowered feed time will raise EC in the pots. I still see some excess N and K so I'm lowering input further to 0.75 EC. These are picky low feeding ladies and I'm following their demands!

It's cold locally so I maxed out the LED at 635 watts at the wall. I also raised it all the way up in the top.

Cheers!
 
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Some of them have early frost on the bigger regular leaves. It's gonna be a lot of good material for hash making.

Now I'm waiting to see buds forming for real to better see the different structures and smell the different aromas. Some are more fruity and other more diesel/skunk early on.

Cheers!
 
Third runoff reading:

375ppm / 0.75 EC in, 500ppm / 1.0 EC out.

pH 6.4 in, pH 6.4 out.

- I'm curious to see where they land tomorrow but if this curve continues I have to lower input even further.

The system runs more efficient since I did the changes and I believe this is the feed time(15 sec) that's good for 1 gallon pots.

I need to remind myself to check feed volume at the end of flower for future reference.

Cheers!
 
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