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Small progress update.
Chocolate Habs and the Fatalii's are still pretty desperate, but the rest are pretty healthy. I will start potting up the Bangalore whippets tails and the Big Bombs next week, pretty much all 16 are about ready.
Need to work on a couple of things though...
The temperature in the grow tent needs to stabilise a bit...
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... You can see the two distinct levels that indicate when the heating in the house is off or on, and then the heater in the grow tent provides the 'teeth' on the graph... I want to smooth out those teeth, so I think I'll try to insulate the grow tent a little, and perhaps change from a fan heater to something else. I was thinking about an electric oil filled radiator, but what I really need is the equivalent of underfloor heating fitted to (what will be) the two levels in there.
I've been looking into light levels as well, I'd majorly underestimated the difference a few inches can make to the lux falling on the plants leaves, and there's a fair chance that some of the poor health of the plants last year was because of this. I installed the lights so I could adjust the height of all the bulbs individually, but then didn't bother... This year I will!
I'm using a lux meter app for the phone. It's not calibrated so I can't trust the absolute level, but it will allow me to make sure I'm keeping things at constant levels, and can adjust if a particular type of plant seems to be suffering.
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55 lux is the brightness of the pub I'm currently sat in... The chilli's are under about 18,000 lux at the moment. A bright sunny day is about 100,000 lux, so I'm going to drop the bulbs closer to the plants to increase that gradually... Problem is, the closer the bulbs, the less even the distribution of the light is.. it's easy to get 30,000 lux directly under the bulb, but one plant over, and it's dropped to 10,000. I'll have to experiment.
I'm also going to be less stringent about using rain water this year... But I'll probably put a fishtank heater in the container I water from, so the soil temp doesn't drop as much as it probably was last year, when I water...
.. I'm aiming for consistent air temperature, and consistent soil temperature, consistent light levels, and then I'll worry about consistent humidity, which will likely be impossible... But should help prevent flower/fruit drop, which was higher than I'd have liked last year.