Light: Omega black 720W (set to 250W) Environment: 22-24c, 60-70% RH Medium: Coco canna pro, 30% perlite. Nutes: Canna Coco A+B, Rizo, canazym, PH down (phosphoric) Germination method: pre-soak + paper towel, place in medium when root between 1-2cm. Feed history: pre-watered medium with "light-water" with a starting ppm of 100, then added up to a total of 250ppm with A+B + Rizo, PH 5.8, watered until run off, sprayed lightly once a day, then after 4 days watered until run off with 300ppm same mix + canazym. Age: 10-12 days Strains: king Kong, banana purple punch, Tropicana cookies, all autos question: some of the leaves are yellowing and drooping, could this be over watering due to the pot size or could it be due to the light water base and a calmag deficiency, or light? PPFD meter app reads 400-500 but I doubt it's accuracy, there's little information on this light I can find except a single test done at 250W in a non reflective room which measured 480PPFD @ 2foot. My light is hanging around 4 foot above these seedlings. Worried about adding calmag and adding to any protential overwatering problem, the medium feels damp/moist in the first 2 inches, any advice?
Coco should always be saturated and fed to run off daily. Never plain water and never let the coco dry. Your seedlings are very small for 12 days from sprout........they look more like 2 days old. Here are some seedlings in coco at 10 days from sprout for a comparison.
Thanks for the quick reply, the coco is still wet to the touch and has been wet since they went in. I don't think it's underwatering, what else could be the culprit?
I wasn't implying they were underwaterd. I start in solo cups and I start feeding daily to run off around day 3 from sprout.
I think my starting pot is too big for sure, was a bit of a fuck up last minute change of plans when I started them on 2 24W lights (thinking the 250W would be too much) from seed and didn't have the coverage if they were in final pots, I should have put them in solo cups but I just grabbed what I had. Any ideas about the yellowing and wilting, over watering or deficiency or too much light seem to be the top 3 reasons but it's hard to tell. These are actually 10 days from seed, they've been above ground for 6-7 days, but growth has definitely slowed, starting to worry they're going to be irredeemable if I don't do something soon.
I myself, would up the temps to about 82f-84f, bring the light down closer, and get some steady air exchange going. And I would make sure each seedling, is moving, ever so slightly. And when I feed, I would always include Cal/Mag. Id always include a full spectrum feed. From start to finish. Cal/Mag are extremely important elements. Mag is the #1 container grown deficiency, and weed, is a very very heavy user of Magnesium. They are electrolytes, and are responsible for electrical transmission for the plant. same for humans. Youre fucked, if youre Mg depleted. Same for Calcium. It too, is an electrolyte. Cal-Mg, Sodium, Potassium, Phosphorus, Sodium, are all critical, for healthy plants. And humans. Humans can die, and plants will first use up what they have stored, and also die eventually. Cannibalizing themselves. Humans most likely have a heart attack, with extreme electrolyte deficiency. WhileI have reallygood fresh air exchane, Ive used a 1000W HID-either Mortilux Blue, or Hortilux HPS for starting seedlings. I have the Blue at 20 inches, and the HPS, at 24 inches, and let the plants grow towards the lights. Ive had thema close as a 1.5 feet away, and no light stress, on bigger plants. Main thing is air exchange. This is something to think about. Outside, say, at the Equator. Seedlings get blasted from day one, and much of it is at High Altitude, where the UVA/B, is also much higher, than at sea level. While of course plants wont grow at 20,000ft. In the mountains/Andes, in Ecuador, UV reading have been measured to be as high as they are on Mars. You know the UV Index Rating we see on TV Weather?? 1-10 Rating??? At 20,000ft, in Ecuador, UV has been measured at an incredible 42!!!!! So, you can deduce, its still extremely strong, at 6000-8000ft altitude. Then we have the PPM, of CO2, in the Air, and Umol, of the SUN. Preindustrial Revolution, say before 1850. The PPM of CO2 in the air was about 180ppm-190ppm. The SUN, at its brightest, is about 2100umol, though I dont know if anyone has ever measured this at high altitude. Now,,, the PPM, of CO2 in the air, is 421ppm, but the SUN, is still 2100umol. Ok. Weed has been growing since the dawn of man, with 180ppm-421ppm CO2 in the air, and 2100umol worth of SUN. So why is it people seem to have trouble with light stress, but dont come anywhere near 2100umol in their grow room. People using 200-400umol, and plants are having light stress??? My theory? Though Outside, CO2 levels may be considered LOW by some standards. The AMOUNT, Constant, and Infinite supply of fresh air, and CO2, is simply to much for the plants to deplete. And at lights out?? They still need all the fresh air exchange possible. The first thing I think about when I think of light stress, is the fresh air exchange, is not enough for the plant to use all of the light available.
You got nothing to lose, start feeding them at 250 to 300 ppm with 20 percent run off each day and let us see them in a week. They will start to take off.
Here's a picture of a auto that just came up and I started right then with 20 percent run off at 250 ppm and it's in a 1 liter pot, and here's picture 7 days later feeding every day with 20 percent run off that's very important to do.
I do not think it is over watering or the pot size.....My 2 cents.......the girls are too cold. Warm them up a little. Say 27 to 29C. Stay the course and you should be fine in a week or two
Update: Coco was pretty dry after leaving it all night, I ran a 400ppm 6ph calmag amended feed through (with a+b rizo, zym) and got a 300ppm run off. The leaves have all drooped after 2 hours and now I'm starting to get worried for real. I've had suggestions to move the light further away and suggestions to move the light closer, not sure how accurate PPFD meter (reads 400-500, 24+ DLI at 40 inches @ 250W) I have a feeling the seedlings can't take it. I've moved them back under the 2 24W LEDs, I thought they were stretching under these small lights before, but atleast they weren't yellow and sad.
I've got an extractor fan running and 2 clip ons, they're not occilating though, one is pointed at them from a distance, causing slight movement (I rotate the pots periodically), the other is to direct the air in a circle around the tent. Is 80% humidity dangerous? Also struggling to keep temps above 23c without the big light
I run 18/6 and leaves do droop before lights go out, but yours being little ride it out and try to get your temperature at least 78 to 80 Good luck you will get it figured out, you are way over thinking it, warm it up and feed with 20 percent run off every day.
If you got to buy one of those oil filled heaters in your tent, that's what I use on low settings and it will keep your tent warm and they are safe to run and cheap around $50.00
Ok so I said fuck it and they're going under the big light again with full heat, turned the ceramic heater up to full, should get 25-27c in a while, will continue to water to run off once a day with 300-350ppm (with calmag) and see how it goes. If they die, they die, I'll take the lessons and apply it to the next run.