Today I set up the Master extension. I haven't set up the trellis or even the frame yet, but the plants should be able to hold until then. I'll have to set it up soon because the plants will get too tall for the Gavita to be effective. Right now, the Gavita is sitting about 3 feet above the canopy, and that distance is expected to shorten quite a bit in the coming weeks.
VEG
Base
~10 gal
With the Master extension, I have room to plant more trees. Unfortunately, I don't have many more trees to work with at the moment. The old Phantom clone tray hasn't rooted enough to plant into the net cups, and I don't have any other alternatives. The net cups themselves aren't progressing as well as I'd hoped, although this is probably due to the lack of water over the past few days. I placed them under MH now that MH was transferred to HPS. I cloned Abusive and GG to back up the clones that might not make it with the newer tray. I also opened the humidity dome about halfway to allow the clones to breathe. It's been said that gradually opening the dome increases the likelihood of survival, but I'll have to wait and see how it'll affect these clones.
With cloning came trimming, and the last trimming session I should have with this HPS rotation. I have about two weeks to Veg these for bloom, and one more week if I decide to stretch it. It's a slightly risky move since these plants are way shorter than what I'm used to working with, but that should work to my benefit since every rotation has been too tall to begin with. Today these plants average at about one foot tall. I expect that under a max power HPS, they should be about double that size by the time I transplant them. If I top them in about seven days, they should grow only slightly taller, if at all. That leaves me with plants that are about half the size, but with 25 plants rather than 16, I shouldn't have too much of a problem, and it may even work to my benefit to have shorter plants.
MIDDLE
Yesterday I sprayed a heavy dose of fungicide to combat the spider mites and mildew, and it seemed to keep all the pests at bay. The Bubba seems to have ripened fully, although the buds are about half the size as some of the biggest buds I cut down from the Master. Interestingly, the dehumidifier and air conditioner aren't pulling as much moisture as with previous rotations. This could be because both are working simultaneously; if I leave the dehumidifier turned off, it takes about two days for the air conditioner to collect about 3-4 gallons of water, whereas if both are working, it might take up to a week for both the waste bucket and dehumidifier tank to fill up. I don't have a thermostat to check the humidity in the room, but it shouldn't be more than 40%. This could be a big reason why mildew hasn't spread as much.
The plants themselves are looking healthy on top of the canopy, except for a few buds that are being burned by their proximity to the light. Nothing I can do at this point, since some of the lights are at their max height. I need to make a note of where I'm putting the taller strains, since the ceiling is slanted after all. Underneath the canopy are a bunch of dead leaves which I'll have to remove soon, but for now this room looks on track to hit an average yield of possibly 3 lbs.
MASTER
Base nutrients
Terpinator
With the Master extension completed, both rotations are exactly two weeks apart. Temperature has risen slightly because of the added light, but not as much as two HPS lights. I set up the dehumidifier to run continuously and hooked up a water hose to drain the excess water into the Master bathroom toilet. I also put another fan in the back corner of the room oscillating around the "Gavita" section of the room, and I can feel the air moving around from the opposite corner. This will change once the trellis frame is added and the plants grow taller, but if temperatures don't rise too much it shouldn't be too much of a problem.
I'm a little concerned about the light distribution of the Gavita. The light doesn't appear to be reaching the edges of the canopy as much as I'd hoped, and I feel that this could hurt yields. It doesn't help much that the height is pretty uneven. There's about a two foot difference between the tallest and shortest trees, and the bottom part of the taller trees won't be getting much light. The reflection of the light on the wall actually shows a slight cascade. It'll be interesting to compare the results of these 12 trees against the 16 that I have under 4000 watts of HPS lights. For a fair comparison, I'll have to subtract a third of the yield from the Gavita when it finishes, because there would be only 8 trees under normal circumstances. If the Gavita produces a yield similar to two HPS lights, I'll strongly consider replacing all the lights with Gavitas and use only half the number of lights I use now.
Fungicide has been working so far in terms of keeping the mildew at bay. Combined with humidity control, I feel that I can take care of the mildew problem for the most part as long as I try not to grow too much Bubba. I still don't know why Bubba seems to have the highest concentration of mildew compared to all the other strains, but I don't care. Bubba sells well, but not as well as Phantom, Abusive, Sour, or GSC. If I keep spraying the fungicide with a more aggressive dose and keep humidity low enough in the bloom rooms, I can at least keep the mildew from spreading to other strains. Just to be sure, I'll also be harvesting with hydrogen peroxide to wash off any mildew I couldn't eradicate, as well as any excess fungicide and spider mite webs.
For now, I won't clone any more Bubba and try to introduce more Phantom and Abusive in the rotations. GSC sells well, but doesn't nearly yield enough to justify its place in the rotation, especially considering that I have to sell GSC at the same price as everything else. I'm also dealing with the last remnants of all the experimental strains I decided to work with from months ago, like GG and White Fire, both of which turned out to be mediocre strains at best. I have to be more careful when selecting new strains to work with.