I have a couple of plants that are drooping and showing signs of nitrogen deficiency or overwatering. I am not watering until the soil is dry up to my first knuckle. The plants are currently on Day 23 since breaking ground. They were planted in Happy Frog Soil. I have two 12,000lm, 6500K LED lights and a blurple LED light that I’m not really sure does much. Temperature is about 75°F.
I watered on day 15 with DI water (pH=6.3). The next day, the plants started to look droopy so I thought it might be over watering. I didn’t water again until day 19 after the top 3/4" of soil had been dry for a full day. On day 19 I watered with tap water & fed with Big Bloom and Grow Big (pH=6.7). I also put the plants outside for the day because it was sunny and 80°F outside. After this day, the plants started to look pretty good. I removed the bottom yellow leaves, and the leaves were fanned out horizontally. So some combination of the water, food, & sunlight helped rejuvenate them. I put them back inside b/c the temperature dropped back below 60°F. They started drooping again over the next 2 days. According to my knuckle test, the soil was dry enough to water yesterday, but I haven’t watered yet.
Everything that I’ve read suggests that this is nitrogen deficiency or over watering. I’ve fed one plant nutes twice, and it is looking the best. This makes me think my problem is nitrogen deficiency, but I haven’t seen anywhere that says nitrogen deficiency causes the leaves to curl down like they are doing. To me the curling is the sign of overwatering. The leaf stems are also starting to get a red/purple tint to them; what is this a sign of? Another option could be inadequate lighting; does bad lighting cause any of these symptoms?
I have put the tallest plant (see pics) outside for the day to see if sunlight alone helps it bounce back. In the pictures, the front plant is the other one that doesn’t look so great, and the one on the back right is the one that has been fed nutes twice. It even has a bit of yellow on the bottom leaves. Let me know what you guys think, thanks!