Nitrogen toxicity / overwatering in coco?

Nitrogen toxicity.

Hi there. Coco had the good condition to hold Water. And your PH Levels seem to bei good. Therefore i think you dona little overwatering... Let them dry for three days and reduce the watering to the half ✌️💚 Best regards

You want at least a 33% dryback (loss of water weight) before 'next' fertigation. IF you aren't getting there, could be the problem. This isn't foie gras. You can't force feed it. Well, you can, but it doesn't turn out well. EC converted to ppm is inconsistent. 1000ppm might be too much on its own too. Elemental ppm would be a more useful metric to track, and per nutrient molecule, not just overall. Overall isn't too helpful on its own. Like temps without RH or PPFD without hours of operation.. very limited use.

You mention in your diary you run 60rh% daytime, with the lights off there is normally around a 10 degree drop in temperature from light alone, when lights go off that 60% can rise to 70%, just make sure to monitor overnight, I don't see any nitrogen toxicity, just looks like the leaves are heavily laden with water, losing pressure, means gas exchange is low, not enough water going out to deal with amount of water going in. During day transpiration happens drawing water from soil, at night respiration happens but no water is drawn from the soil, its all drawn from the air and spat back out, 2nd watering of the day could be making things a little too wet overnight, try dry things down to 50% to encourage respiration overnight, keep temps from dropping too low, keep, day/night change to 10F if possible to prevent undue stress. A difference of 10C18F can significantly impact transpiration rates in plants. Warmer temperatures generally lead to increased transpiration due to faster water evaporation and a greater water-holding capacity of the air a leaf can transpire three times as fast at 30C86°F as it does at 20C68°F according to Biology LibreTexts. Its not the only factor involved, but it certainly helps to scrub up on that stuff. Put the pedal to the metal and take her for a spin, exhaust is too small for the engine, she just fell out of gear for a quick minute. 1 watering in morning PH in coco is normally recommended anywhere from 5.4 to 6.5 pH, although 5.7-6.1 is preferred. a pH exceeding 6.5 can limit the availability of nitrogen when your doing coco, but there seems to be no visible indication nitrogen supply is toxic or deficient, but I am wrong 99% of the time. K is the nutrient responsible for turgor pressure, when you use coco, who knows What is happening? Was it charged? Where is Numbers when needed? He has some tried and true Coco COIR links. not ideal to blanket feed fert, auto or not, it should be monitored with a EC meter for soil to give you a idea of how much salt build up you have, once it gets to a point you need to flush to reset/dilute the coco medium to acceptable level then re apply a balanced fert, I think these autopots are notorious for salt buildup over time so definitely look into monitoring whats going on and keep on top of it. Hope that helps some, great growth for 3 weeks very impressive, keep it up

Hey growmie, looks like overwatering in coco. 5 gal pots with a small plant won’t need 2x a day feeds this early, especially if the coco stays wet all the time. I’d let it dry back a bit between waterings to get more oxygen to the roots. Maybe try feeding/watering around 1.5L per day for now. She’ll perk back up. PPM and pH look fine otherwise.

I think when you increased the ph you went too high and I think your over watering. If you feel the coco you get a fairly good idea if it needs watering. Drop back to ph 6.0 and watch the watering. Best of

Well your problem is over watering 100% you need to let the soil get really dry b4 watering. Why are you watering 2times a day Your better off just letting the soil get really dry and then water till the soil is wet all the way thru Sometimes when the plant is small and doesn’t have a strong root system yet and you get the soil completely wet you could go over a week b4 watering again

Your plant shows clear signs of nitrogen toxicity (dark, clawing leaves), combined with possible overwatering since the coco never dries. Adjust your feeding: lower nutrient strength (reduce ppm) and increase runoff slightly (20-30%) to flush excess nitrogen. Return pH back to around 5.8–6.2, as 6.5 is too high for coco-based substrates. Allow the substrate to dry slightly between waterings to ensure oxygen reaches the roots.