Currently I’m letting the soil dry up a bit longer. I plan to just do a calmag feeding on ones showing issues
How come you plucked the leaves off of the plant? Can you provide some more information so we can properly diagnose?
What strain is it?
Is it in Veg or Flower stage?
If in Veg, for how long?
If in Flower stage, For how long?
Indoor or outdoor?
Soil, Soilless or Hydro?
If soil/soilless, what is in your mix?
If soil/soilless, what size pot?
Size of grow space (LxWxH)?
Make and model of grow light?
Temperature in the environment?
Humidity in the environment?
PH of medium or reservoir?
PPM of medium or reservoir?
How often are you watering?
Type and strength of nutrients used?
4Wx4Lx9H 16 plants. Autoflower half 3 weeks (21 days) into veg and other half 4 weeks (28 days). Fox Farm ocean forest soil with a top layer of Happy Frog, all planted in 5 Gal. Potting buckets. All planted at seed. Air temp. Is consistently 66°F - 78°F. I’m using AN Sensi Grow A & B. with supplements being AN B-52 and Turantula currently. On the plants at 4 weeks I’m not feeding tarantula.
plants at 3 weeks I was giving: BlueLab Pen 700PPM Scale (1800 PPM)
2ML per liter of A & B Sensi Grow
2ML per liter of B-52
2ML per liter of Tarantula
plants at 4 weeks I was giving: BlueLab Pen 700PPM Scale (2200 PPM)
4ML per liter A & B Sensi Grow
i feed the plants whenever the medium is completely dry. (using the lift method & checking top 2in of soil)
I have been battling the RH% keeping it consistently at 30%-45% but it’s hard to increase. Also if the Humidifiers run out of water mid-night the humidy will drop to 20-25%..
I see no signs of pests. I keep a sanitary grow, this is operating inside a tent inside a closed garage. I’m running 2 portable AC units 3200 LED watts.
1x 2000 Watt LED Cob by Aglex
2 x 1200 watt LED Cob By Aglex
PPM using blue lab pen on the 700PPM was 2200 PPM for the 4 weeks and 1800 PPM for the 3 weeks. I’ll have to check the strains showing signs but one of the strains showing signs is Girl Scout Cookies Auto.
i have a water chiller for my DWC grow set at 64° but I’m not using that water I’m using reverse osmosis and the temperature is 78°.
My water PH is always between 6.2 - 6.5 always used reverse osmosis.
I have one 6" inline fan pumping air from top to bottom of grow space, I have another 6" inline circulating air. This is a closed circuit grow. I have two 9KBTU Air units pumping into the room one turns on automatically if the temperature rises above 76F. The other is running 24/7. I also have two caged fans by jardin 6" on the corners moving air.
Next week I will be adding CO2 into the grow space. I'm using the same nutrients in my RDWC grown and am not experiencing any problems. nearly the same regiment, I go by the recommendations of AN for feedings.
the only time my humidity drops below 30% or my temp. rises above 80 Fahrenheit is when I have to do work in the tent. Or if the humidifiers run out of water while I am asleep. I am running two humidifiers, I live in Las Vegas N.V. So it is very hot inside garage. 118 Fahrenheit, so the tents heat up fast. Currently for feedings and LST I take one plant out at a time and do the work inside the house.
I suppose it could be a Ca deficiency; early onset. I assume you're growing in soil(?). Then why only 4 of 16 if they're all getting the same of everything?? Before you dump "panic" nutes, check your water pH and soil pH on the regular. Bad pH can really upset nutrient uptake. Your soil might already have what it needs for the grow to thrive, but a possible pH issue will never allow the plants to get what they need from the soil. My well here in WA. is 8.5 so I pH down to about 6.4-6.5 before I water, every watering. My soil sits at a consistent 6.9-7.0 pH. No nutrition issues ever, from seed to take down.
I would seriously inspect all your plants for what may be a pest outbreak. Use a magnifying glass if need be. Look for tiny bugs, eggs or egg cases and pest skin molts; especially under the affected and larger non-affected leaves.
The PH for runoff and for feeding always stays between 6.2 - 6.5, I use PH perfect nutrient line by AN but I still check for my logging. I checked the damaged leaves for any signs of pest and the grow room and other plants. No signs indicating pests. I'm concerned this is a toxicity or deficiency or maybe signs of both.
Keep a close eye on everything we’re touching on. Your pH seems good to me. Keep the nutrients as directed. Don’t make too many sudden changes. If it were my grow, I’d remove every leaf that is showing signs and then carefully watch the remainder for a continuation of the issue on the same plants. Patience could be key here.
I'm about to do a watering, feeding on some I will do a update with each plant. most look absolutely amazing, just a couple responded weird to last feeeding
Your plants look pretty good overall. It seems like your conditions are fine for the most part. Many of the markings you show on the new pics really look like they are from past overwatering imo. Looks like it's from awhile ago though like around a week or two. Sounds like you're watering fine now though from how you explain it ?
I'm not too sure a couple of them still look to be a little sick but the other look like they are bouncing back. I will post some more pictures today. Thank you, I believe it was a Mag deficiency
dont know if im allowed to post links from youtube videos. if not you can delete my post . i just came across a nice video so maybe this will help you even more . https://www.youtube.com/watch?v=KgPvFffsc2I&list=PLBpWI4HLQdwZJxEezrm3R9Q8ES-nVlMuy&index=18&t=0s