Currently growing in RDWC. I have been growing for almost four weeks. I need help in getting my babies healthy. Any advice or comment is sincerely appreciated.
To elaborate: I have my first grow in a DWC setup, four sites, and I have tried to learn as much as possible in growing before I invested and started. First, a little about my stats and status:
This is week 3 since germination, and 11 days post placement in the DWC system. System is recirculating, on a chiller, and holds up to 22 gallons to the bottom of the net pots. They light is at 40% and 18 inches, as per manufacturer recommendations. Nutes - General Hydroponics - Flora micro @ 4.2ml per gallon, flora grow @ 2.8ml per gallon, and flora bloom @ 3ml per gallon. Water - Temp is held at 69 (nice) degrees and is allowed a three degree variation before chiller kicks on. Air - currently humidified to 65% humidity and is a consistent 80 degrees F. four small fans are gently moving area around the 5x5 tent. PH - Has been consistent between 6.2 and 6.0 for the duration of the grow. EC - currently .9 and has been as high as 1.1 PPM - Swings between 310-505
The plants were doing fantastic for quite a while. I moved them into the pots and they took off so fast! the first set of leaves was healthy and developed, and I did a weekly water change, and everything was fine for 48 hours, then I noticed a yellow tinge on the tips of the leaves. I double checked PH, EC, PPM, and light distance and power. I adjust PH down from 6.4 to 6.0. Two days later, a brown spot had developed on one of my plants, all 4 had a little droop to the leaves, and the rapid growth had stopped. The brown spot grew on the leaf (looks like a dead spot) and 3/4 plants now had what looked like bruises on the first set of leaves along with the yellowing. I did some reading and made a couple of assumptions. I was either over watering them (DWC so not enough bubbles and air gap) or the PH was wrong. I assumed it was over watering. I dropped the water level to 2" below the net pots (was at 1/2 inch) and got another air supply for the stones. The next day there had been no improvement, and a little progression of the yellowing and bruising. I also noticed one set of leaves was bending upward, like they were folded origami. I decided to reduce all possible stressors, and did the following:
-Reduced light intensity, increased light distance, reduced the possible temp swing of water to one degree, diluted nutrient solution, after adding CalMag (possible Calcium deficiency suspected by close friend), adjusted PH to 5.8, reduced humidity to 50%, and took photos of the plants.
SInce the changes, it has been 36 hours, and there has been no growth or severe progression in the malady. I dont know what this is, and I have looked at every available resource for diagnosing the issue; however, no one or two things really fits this.
I will post more pictures in the comments if requested or if they didnt make it to the link. I have dozens.
