This week in my grow room has been full of developments. First, I added additional lights because I couldn't get the relative humidity (RH) under control. I ordered a dehumidifier, but it will take a few weeks to arrive, so I had to find a temporary solution. I also emptied the reservoir and refilled it with fresh water and nutrients. I secured the net to ensure it stays in place under tension. In two days, I plan to switch the light schedule to 12/12, hoping the plants will stretch a bit during the switch to avoid having overly large buds that aren't evenly spread.
Seventeen hours later, I decided to keep the lights on a 16/8 schedule for a few more days. The plants are starting to show signs of something happening, so I want to see how they develop. I will keep you updated on the progress. Then, I received a message from my supplier that the dehumidifier would arrive today. Great news—time to spice things up!
On June 2nd, the dehumidifier arrived, and I managed to get my Vapor Pressure Deficit (VPD) to 1.17! This is fantastic news, and I'm very curious how this will affect water usage. The dehumidifier seems pretty powerful, with water literally dripping out of the hose, so I'm no longer worried about high humidity levels. It's a shame it doesn't have a range setting, but I couldn't expect more for the price. I'm considering ordering the Dimlux Auxbox to set a working range and separate day/night settings. Thankfully, the dehumidifier has an auto-restart function after a power loss.
On June 3rd, the night is over, and while my values are now more stable, I haven't noticed any significant differences in water absorption. What I do notice is that the pots seem much drier. The difference in leaf temperature compared to the room temperature has increased slightly, now about a 2˚C difference, indicating that evaporation has increased somewhat. Despite the dehumidifier cooling the air, the room temperature has risen. This is explainable since dry air heats up faster than humid air. The CO2 heater is also running significantly longer. So, although there are no immediately visible differences, there are indeed some changes.
Today is the last short night of 8 hours, and tomorrow will be the first night of 12 hours. I am contemplating doing a 10-hour night first and will decide later tonight. After closely reviewing the video footage, I noticed some divergent colors on the leaves. My pH is currently 6.4, which I had adjusted to compensate for the low pH last week—a foolish decision in coco, I know. I plan to make videos of each individual plant for my records to investigate further. The light is too intense to inspect them up close, so the videos will help me get a better look.