Zkittles Auto (Fastbuds) + Quantum Board

WEEK 4 Day 22 - Gave the plants a foliar spray of 4g/L of magnesium sulphate solution. Dropped light cycle from 21 hours light back to 20 hours light Day 23 - Increased light intensity from 240 watts to 300 watts. Day 24 - The plants continue to grow very well. The leaves are huge, the largest ones are already about as big as my hand. To be quite frank, I've never seen anything grow this fast in my entire life (not that I've really watched many plants grow LOL). I'm totally stoked with this grow so far. Day 25 - Noticed the plants drooping a few hours into the day cycle. Checked and the pots were dry so I fed the plants with a 100% strength nutrient solution. Solution Details - PPM: 1150 - PH: 6.2 - Temp: 22c - Volume Given Per Plant: 3300ml - Volume Run-off Per Plant: 1000ml - Run-off PPM: 1050 - Pot weights before watering: 4.0-4.2KG - Pot weights after watering: 6.0-6.2KG Day 26 - I think I've left it too late to LST the plants. I'm not really sure having never done it. I was planning to do it this week but they grew so fast I think I might have missed my window for training. I am tempted to top them as they seem to be developing a really great structure and the lower laterals are coming up fast. Was sick today and ended up not getting the photos done for today. Day 27 - Considering doing some LST or topping them. Put it off yet again. I get the feeling I'm going to end up not doing any LST or topping on this grow. I'm such a chicken LOL but the plants are doing so spectacularly well I'm afraid to do anything wrong and fuck it up. The growth over the last 3 days has been amazing they've really started to grow up and out. Suddenly they have laterals shooting up. The plants are between 15 and 30 cm tall. Day 28 - The pots already feel light. I just weighed them and they're around 4.3-4.6KG so its definitely feeding day today. This puts them on a 3 day feeding cycle already. I decided to tuck the big sugar leaves under. This has exposed the laterals underneath and will hopefully cause them to start strengthening up. I might pluck some of the big leaves off soon I think. I'll update the diary later today with photos and details of the feeding. Fed the plants with a 100% strength nutrient solution. Solution Details - PPM: 1110 - PH: 6.4 - Temp: 22c - Volume Given Per Plant: 3300ml - Volume Run-off Per Plant: 1000ml - Run-off PPM: 1100 - Pot weights before watering: 4.1-4.2KG - Pot weights after watering: 6.4-6.5KG I plucked the second and third sets of large sugar leaves (from the top of the plant) to let light through to the laterals and encourage them to grow out. I also removed the bottom (spindly) set of laterals from each plant. I've been having issues with my ventilation. I have two tents venting into a Y joiner and then into the roof space and never having had any experience with ducting or air flow dynamics, I had no idea that when the pressure coming from both tents wasn't balanced that the stronger pressure side was creating back pressure against the weaker side. I currently have my Gorilla Glue tent using a carbon filter, and my Zkittles tent using no carbon filter, so the Zkittles tent has much more air flow venting from it. This was creating a backflow force against the Gorilla Glue vent and pretty much stopping the air-flow out of the Gorilla tent. To resolve this, I mounted backdraft dampners on each duct between the ducting and the Y joiner. I also mounted an inline booster fan on the top of the Y joiner. I tested it by shutting off one of the fans, and the backdraft dampner kicked in and shut the vent to the tent with the switched off fan. I restarted the fan and the backdraft dampener opened up again allowing it to vent to the Y joiner. It looks like the booster fan is now pulling the air-flow from both tents through, and hopefully eliminating any back-pressure forces from imbalanced venting force. I'll do a test later on today once the lights come back on (I did all this while the lights were off) to confirm both tents are venting fully. I will test this by blowing smoke toward the carbon filter.. if it gets rapidly sucked into the carbon filter then I know it is drawing in air properly. I'll do this test with various fan speed settings in one tent, and confirm that the air-flow remains the same in the unchanged tent, and vice-versa. I have to say, it never occured to me that joining two tent vent ducts into one via a Y joiner would have any issues - but I guess looking at it with hindsight that it makes sense that if one was exhausting air with more force than the other, that it would repress the weaker flow. In hindsight, the more elegant solution probably would have been to have both 100mm ducts from the tents go into a Y joiner with two 100mm holes for the tent ducting, and then a 150mm duct to take the combined airflow into the roof space. Hopefully the booster fan mitigates the issues I've been having. I will update with the results later today. The leaf tuck, then pluck has really seen a change in the plants. The laterals are all coming up and looking for all the world like I've LSTéd them. I'm so stoked.. they are looking really well setup for their next stage of growth and all I'm going to do from here out is selectively tie the limbs out to keep them equally spread so they don't overlay one another, and that should be it for the training. This week has been stellar and I'm incredibly excited for the rest of the grow.