ETHOS Clones (Diary #8)

I think the cause of the leaf cupping is a CaMg lockout due to low pH. It's really only happening on plants 5.7 or lower. All plants with a low pH will be watered with a slightly higher pH for the week to keep the range for CaMg uptake. They're all growing and look relatively good, still some minor clawing on a few leaves, which I hope goes away once the pH improves. The last cut (Cherry G-S-Y) will be transplanted tomorrow morning. Currently soaking in Sensizym at pH 5.8. I still have to buffer it and all that too. I'll be topping up some of the bags so it has to be close to what's in the bags now. Environment: --------------------- Humidity: 55-65% (Average 60.8%) Temperature: 21-25c (Average 24c) VPD: 0.81-1.1 DLI: 18 Feeding notes: Jul 18 - Premixed nutes went up 10 PPM to 383 over 24 hours KC1 In: 383 PPM/6.2 pH Out: 372 PPM/5.8 pH (20c) (-11 PPM) ✅➡️ KC2 In: 383 PPM/6.2 pH Out: 373 PPM/5.7 pH (20c) (-10 PPM)✅➡️ MC In: 370 PPM/6.0 pH Out: 356 PPM/6.0 pH (20c) (-14 PPM) ✅➡️ ELB In: 383 PPM/6.2 ph Out: 380 PPM/5.7 pH (20c) (-3 PPM)✅⬇️ ELB2 In: 370 PPM/6.0 pH Out: 357 PPM/6.0 pH (20c) (-13 PPM) ✅➡️ CG In: 370 PPM/6.0 pH Out: 310 PPM/5.9 pH (21c) (-60 PPM)✅➡️ GS In: 383 PPM/6.2 pH Out: 390 PPM/5.7 pH (20 c) (+7 PPM) ❌⬇️ • pH still low on KC2 • Watch substrate temps (not below 20c) • Mixed nutes for tomorrow (370 PPM) I'm mixing the strongest solution and adjusting the highest pH first. Then diluting for the next set and lowering the pH accordingly. Definitely more work than I'm used to. If I can't get the PPM to be consistently lower than inflow, I may have to go to 2 events per day. Currently only watering 4 hours before lights OFF. July 19 Not watering today to let the coco dry out. The leaf cupping could also be overwatering so I'm just trying to eliminate one cause at a time. Transplanted the last cut out of the solo cup and into a 3 gallon bag. Put them under the MH lamp with the rest. Jul 20 Next watering will be tonight and it will be a good dose of CaMg with a pH of 6.3. New plants are fine under MH lamps and I've lowered them accordingly. Leaf cupping is almost certainly a CaMg deficiency due to low pH locking it out. Overwatered the lot of them trying to adjust so I'm letting them dry out some more today and will water tonight if the bags aren't too heavy. Mixed 17 gallons this morning which would work out to about 2 gallons a plant. Hopefully that's enough of a flush to boost the pH. Jul 21 (Low pH plants) Event 1: AM (2L) KC1 In: 385 PPM/6.3 pH Out: 500 PPM/6.6 pH (21c) KC2 In: 385 PPM/6.3 pH Out: 496 PPM/6.3 pH (21c) ELB In: 383 PPM/6.3 pH Out: 504 PPM/5.9 pH (21c) GS In: 383 PPM/6.3 pH Out: 508 PPM/6.7 pH (21c) Runoff of 250-400ml, I took measurements off that. There's insane pH spiking going on with 2 plants. Will check again Event 2: AM (1L) KC1 In: 373 PPM/5.9 pH Out: 410 PPM/5.8 pH (20c) (-PPM) KC2 In: 373 PPM/5.9 pH Out: 415 PPM/6.0 pH (21c) (-PPM) ELB In: 375 PPM/5.9 ph Out: 418 PPM/6.0 pH (21c) (-PPM) GS In: 375 PPM/5.9 pH Out: 428 PPM/6.0 pH (21c) (-PPM) Runoff was almost the entire litre so I need to stop watering. KC1 pH makes zero sense. 5.8 to 6.6 with a 6.3 ph IN, then 6.6 to 5.8 with a 5.9 IN. No idea wtf is going on there. All plants pH at 5.8-6.0 now. Might've been completely wrong diagnosing this leaf cupping...it's probably overwatering. Starting to get some drooping too. I'm just gonna chill this weekend and not touch them, just try to keep the humidity down when lights are off. May have to let these almost totally dry out to fix this. Jul 21 Fans turned down to low (or off) during lights on. Running a dehumidifier set at 55% in the lung closet during lights off. This keeps the humidity between 55-60% now. I'm going to try to get the night temps to 23-24c and daytime to 27-28c. Jul 22 (2-3L) * 3 gallon containers MC In: 370 PPM/5.8 pH Out: 485 PPM/5.9 pH (21c) ELB2 In: 370 PPM/5.8 pH Out: 424 PPM/5.9 pH (21c) CG In: 370 PPM/5.8 pH Out: 588 PPM/6.3 pH (21c) Bags were light so I gave them I good drink this morning. The Cherry G-S-Y runoff looked like hangover piss and the PPM out was way higher than the others.