Durban Poison SCROG SIP (Sub Irrigated Planter)

This week I added a new controller to handle up to 8 functions. I installed a new heater, my old humidifier and some LED strips to the controller. Targeting a VPD at 1.0 day and night. Trying to keep the nutrient ppm under 900 and ph at 6.0 in the reservoirs. Ordered a second ph pen because I don’t trust my readings. Will be here by Thursday. Friday: Checked the ppm in the reservoirs and it’s at 1,000. Added more RO water with extra nitrogen to bring the ppm level down to 925. Saturday: I installed an updated AC Infinity controller 69 Pro Plus (controls 8 pieces of equipment) which allowed me to add a humidifier, corner LEDs and a heater to the controller. Overall I’m extremely impressed with this AC Infinity equipment. My VPD is within the range I want to achieve (.8-1.1). I programmed it to maintain 78 degrees and 67% humidity during the day, 73 degrees and 63% humidity at night. Charts posted also show the impact of an open tent compared to the closed environment. The heater is constantly pushing fresh air into the tent, so I don’t need to cycle the exhaust fan often. Rewired the tent again and moved the controller later that night. I mounted the controller on the wall. Added Mars Hydro UV/IR lighting to fill out all 8 slots on the controller. Sunday: I checked the ph in the reservoirs (6.8….i had filled it with 6.0 ph) and the ppm (1200 ppm…I had filled it with 900). So evaporation and possibly a mismeasurement of ph. I topped ff reservoirs with slightly stronger nutes and adjusted ph to 5.8 in the reservoirs. Poor magnesium absorption could be driving some leaf yellowing. Effective tomorrow, I’m switching over to Heads Formula which consistently feeds GH Flora series nutes at Micro (6ml/g), Bloom (9ml/g) and cal mag (3ml/g). Turned on the UV/IR lights for 3 minutes every 8 hours. I’m easing the plants up to 5 minutes every 6 hours which will provide the recommended 20 minutes of IR per day. This will help the plants stretch a little more. Monday: checked ph and ppm in reservoirs. 6.1ph and 880ppm. VPD remains stable except when I open the tent. Tuesday: checked ph (6.4) and ppm (880) in reservoirs. Added .5ml of ph down to two reservoirs. Still see slight yellowing between the veins but it’s not getting worse (might be improving). Adjusting ph down to 6.0 target might have solved this. The plants grew by 1-2” last night…..is the infrared light working already? Decided to mix up fresh nutes for the reservoirs following Heads formula. 6ml Micro and 9ml Bloom per gallon of RO water. Added 5 ml of CalMag too. Ending ppm was 1080 which is too high, so I diluted down to 880 with RO water. 6.0 ph. Wednesday: plants grew another .75 inches last night. I topped above the 5th node. Thursday: added RO water with heavy cal mag to reservoirs to increase amount of CalMag available.