Sour Diesel. High frequency fertigation

Carl_Lauberbach Sour Diesel cuttings obtained from Growisland were received on 17.09.2025 and immediately transplanted into biodegradable pots filled with coco substrate. The plants are irrigated once daily, ensuring at least 10 % runoff. The final image displays the analysis of the tap water used. To achieve a calcium-to-magnesium ratio of 3:1, 0.4 mL Mg Mono (Canna) is added per liter of tap water. Subsequently, CalMag Agent is supplemented until an electrical conductivity of 650 µS/cm is reached. A heater and a humidifier are connected to the growth chamber in order to maintain stable environmental conditions.

Carl_Lauberbach Three of the plants developed powdery mildew. The infected leaves were cut off, and the plants were sprayed with a 250 mg/L hypochlorous acid solution. The humidity was reduced to 60%. The plants are still watered once a day with 10% runoff.

Carl_Lauberbach Eight out of nine plants were topped on 26.09.25. One plant was not topped due to an infection: the leaves showing symptoms were removed, which led to strongly impaired growth. To avoid further setback, this plant was left untreated. The cuttings did not originate from the same mother plant, which is reflected in the different phenotypes. Some plants exhibit much denser growth than others. In the small box, the environmental conditions were 25 °C / 21 °C and 55 % / 60 % RH (day/night). The small humidifier was not very sensitive, which caused fluctuations in RH. The plants were transplanted on 30.09.25. For transplantation, the biodegradable pots were sprayed with water twice before removal, as the wet material can be detached easily without causing significant damage to the roots. The plants were then placed into the grow tent and watered to runoff using the irrigation system. The fertigation plan was switched from light to normal nutrient supplementation. Initially, the pump runs twice per day for 5 minutes: the first cycle just before the lights are switched on, the second 9 hours later. The flow rate per dripper is approximately 51 ml/min, resulting in about 500 ml water per plant per day. Since this amount is likely excessive, the pump runtime will be adjusted. The aim is to achieve approximately 10 % runoff. The radiator is set to 22 °C. The heater, humidifier, and exhaust fan are regulated via the AC Infinity Controller (AI) to maintain 26 °C and 60 % RH during the day, and 22 °C and 58 % RH during the night. The lights are dimmed to the lowest setting.

Carl_Lauberbach The central plant was topped on October 4th, 2025. The photoperiod was switched on October 6th, 2025. At this point, the plants had reached a height of 32 cm. The plants are now being watered five times per day, with an initial irrigation pulse of 14 minutes. The following four events occur at 2.5-hour intervals, each with a pulse duration of 6 minutes. Today, the plants will be sprayed with a 250 mg/L hypochlorous acid solution to prevent potential pathogen growth.