Army of Dankness - Bruce's Budtastical Battlepalooza

R1 Day 22 / M1 Day 6
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R1 - RBF/Duke got 75% Veg to run-off, plan to do 100% Veg next feed. RBF still pulling ahead in leaf area / water usage. But, otherwise thriving.

Time to start tracking / logging heights more (plant & lights) before stretch starts.

M1 - Sawney's are off and running. Using 3-gal pots for these guys. They're on a '50% pre-charge / plant in place / then RO only' diet for now (+10 ppm orphan souls for deadite).

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Project Update
FYI - I'll start using 'R' to refer to my 'main grow' rounds and 'M' to refer to my second 'mini-battle' grows.

E.g., BBB-R1-D22 and BBB-M1-D6, etc.

You've been warned.
 
R1-D27 / M1-D13
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Duke vs. RBF
RBF is still bushier / thirstier, but Duke is getting taller / quicker.

I was expecting stretch to not start until now-ish (~Day 30), but they already put on a good bit of height last week.

Feed is 100% now, and lights are 20/4.

Deadite vs. Lecter
Feed - 25-33% (ramping up)
Lights - 100% @ 18/6

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Have you ever thought about writing a book? I would love to have this is book form and you are funny to read.
 
Have you ever thought about writing a book? I would love to have this is book form and you are funny to read.
Lol. Damn. Thank you - that compliment hits me kinda deep.

I've always wanted to re-write this:

"Zen and the Art of Bruce Campbell" has a nice ring to it. In today's market, I think it'd have to be a cross-platform combo of written articles, powerpoint lecture videos, and podcasts. And spreadsheets, of course. Maybe some Venn diagrams, too, if I'm feelin' saucy....
 
Ok, so not completely sure what's going on with my daily water usage numbers.

I'm thinking it may be fan / evaporation-related. I switched to my usual tower-oscillating fan, but have been rotating the plants (left vs. right) in the tents and haven't been really controlling fan placement or use itself. Past week or so, it's been about 3-ft from plants (outside the open tent) and blowing towards the plants (on low setting). Today, I moved it to 2-ft and turned it around so it's just pulling suction from the general tent area. We'll see if / how much water consumption goes down as a result.

(For comparison, when I used to grow in a closed tent, I would shove the tower fan into a corner and blow into the corner, not directly at the pots. Having it farther away probably doesn't offset blowing towards the pots, evaporation-wise.)

Alternatively, these are based on manually recorded weights at each watering (pre-watering weight minus previous post-watering weight) - so it could just be a data thing. And, I've always wondered how water usage varied between each watering - e.g., I would suspect initial water usage right after a watering would be higher and slow as water is consumed, etc. So, I added a scale in-place under each plant so I can start logging weights in between waterings. More souls data for the cannanomicon spreadsheets.

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Hygrometer Calibration

Been soaking a pair of wifi hygrometers I have for about 2 days so far. Looks like the humidity in the bag has finally stabilized based on deviation from a logarithmic trend line. I'll let them soak for another day or two to make sure they're stable before final adjustment.

Then, I'll probably either check against RH packs and/or re-run with some air movement to compare.


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Hygrometer Calibration (Final)

Below are 4.3 days of data in a salt box. The hygrometer was calibrated at ~4500 minutes, and all the data below includes the applied adjustment factor (i.e., the vendor app adjusts all data retroactively). The hygrometer was left in the box another day following calibration. Over that time, measured RH continued to increase by about 0.5%.

When you do a salt-box calibration like this, there are two main factors that you are fighting against. First, the time delay for the ambient bulk humidity to equilibrate to the salt solution's RH. Second, the time delay inherent in all commercially available adsorption-based sensors like these. This is in addition to other typical instrument errors like non-linearity, hysteresis, noise, and overall bias.

I was hoping that comparing to a trendline would at least indicate when the box hit the salt's equilibrium point, but it looks like each jump in the Error plot below was just due to temperature fluctuations. However, comparing the change in that change (DError/Dt) over the course of the run does at least give you an idea of the random error for the sensor. Without knowing the specs of the exact chip itself that the hygrometer is using, I compared the change in short/mid/long period trailing averages (below) and said 'good enough' at 4500 mins.

The second item - inherent time delay for adsorption-based humidity sensors - is because the sensor substrate itself has a similar logarithmic boundary layer behavior. For the chips themselves, this is typically reported as 'response time' - i.e., time for sensor to reach 90% of actual value - and is usually on the order of a few seconds to a few minutes for most process-control sensors. This hygrometer is intended more for residential smart HVAC-type applications, so a much longer response time (~1 day based on the run below) - but some of that could be due to the first factor (time for ambient RH to equalize to salt equilibrium RH). Plus, it's a bit old and has been abused a bit - both of which would be expected to increase response time (e.g., as the substrate gets contaminated over time, etc).

That last 10% goes exponentially slower - so this one should probably take about 11 days total to reach 99% (1 day for first 90%, 10 more days for second 9%, 100 more days for third 0.9%, etc).

Point being that - at least for this sensor - the response time error compared to the timeframe over which you are trying to measure a change would likely be much larger than the other sources of instrument error. But, next item would be checking this against an actual process-control chip with a known response time, etc.

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I blew a COB:

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This was probably after ~15,000 - 20,000 hrs of usage . Reasonable for most industrial components, but far from the 50,000 - 100,000 hrs that many LED manufacturers claim. Granted, I've probably been running it a bit on the hot side.

But, in true China fashion, the manufacturer (Phlizon) offers a 3-yr warranty. I purchased this 3 yrs and 2 weeks ago... :rofl: :rofl:

I guess not bad for a $150 light, though. I'm sure it would've cost just as much to ship it back under warranty anyways.
 
R1-D35 / M1-D21
Duke vs. RBF

Duke is already at +36" (soil to tip). I guess basketball tryouts are next.

I feel like in the past, when I've had some seedlings struggle like the Duke, they've gone on to be on the taller/faster/stretchier side. But, overall, probably just sativa vs indica differences between the two. Regardless, Duke is gonna need some supports or training soon.

The noise/ripple in the daily water graph is just sampling issues (i.e., calculating 24-hr daily usage from a 2-hr period vs. a 2-day period, including / not including lights off, etc). The total / averaged water use looks like maybe the air flow had some impact on evaporation. That's something that's probably better to look into during flower instead of stretch, though.

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Deadite vs. Lecter

These two seem to be doing great for just being shoved in a closet. Should be starting stretch later this week.

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So, there's this from CannaMed 2022:

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Then, there's this for $1600+:

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Then, there's this made from a $25 igloo cooler and a spare 12VDC PC fan:

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The spikes are me opening the box to check progress. That first hump up to 1.0 kPa is because I originally didn't have a separate water source. And, this is at room temperature and not chilled. And, it's only a 1/4 the size. And, I still have to wait for harvest to try it out on actual product. Plus, racks and other final tweaks.

But, ~4 days at optimal VPD with 1/4-scale water removal and no active control? Seems promising. Next trial will scale up the water removal amount.

If only my chinaexpress wine fridge would get here, but it's looking like I may have to cancel and re-order from another seller.
 
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