A question from a fellow grower:
Pure Coco, rinsed to a ph of 5.8, and pre-loaded with the General Hydroponics trio, at the rate for seedlings. The low rate.
Pro-Grow 260 watt LED. Both spectrum’s on, as I am finishing some Auto’s in the same space.
I started with it at 16". It is now 24" I’m trying to dial-in the best height. I will likely never use it for seedlings again, as a t-5 fixture in coming next month, for seedlings and clones. But, I still want to know what’s what with my LED. Never say never.
Temp is 29 C. Humidity runs from 25 to 50-ish.
24 hour light
3 in 1 gal pots, the other in slightly smaller Yogurt containers.
All have 1 1/2" rocks in the bottom of pots to aid in bottom drainage and aeration.
Here is what I am experiencing. 4 out of 6 's initial single, serrated leaves looked crispy on the outsides. Kind of splotchy white, like the chlorophyll was gone. Right after emerging. As emerging. After two days, this material was obviously dead, and I carefully trimmed it back to living tissue. The next set of leaves on all are coming on, and they look lime green, and healthy (with the exception of one with the very outer extremities of the pair white-ish. However, this is not moving in, it is staying the same. ) The Cotyledons are completely normal, and healthy.
Two of the girls look wonderful. As healthy as you please. Herein lies my perplexity. They have all been in the same environment. Identical. The obvious possibilities that came to my mind was 1) over fertilization. Seems unlikely, given that coco has 0 nutes in it. 2) light burn. I suppose there could be enough natural variation in the tissue of the different plants that the same amount of light good for two is to strong for 4. This, somehow, don’t seem correct, though. And the Cotyledons are unaffected. If it were light burn, wouldn’t they at least show some stress, under a magnifying glass? I think they would… 3) Something to do with the seeds themselves. Like the leaves were dried out prior to emerging??
I’m completely stumped here. It is the two perfectly healthy ones that make this almost impossible for me to land on one answer.
One last data point. I had them in the freezer, wrapped in 5 layers of airtight containment. I have kept my seeds in the freezer since Christ was a Corporal. Never once had an issue.
Any comments, criticisms or observations would be great appreciated