Nitro Toxicity?

The heating mat is no good if there is water trapped anywhere in that pot and root zone temperatures go above approximately 75°F this can negatively affect water uptake and overall plant health.. all you are doing is accelerating bacterial growth. Pots should be elevated, with gentle airflow, keeping a little bit of evaporation, helping out with ET(evapotranspiration). Your plant looks like a great size for the pot, but if there is any soil compaction above a point then no roots will penetrate, if roots cant reach, then daytime transpirtation cannot remove the water via roots, if transpiration doesn't move it, evaporation must do so within a time frame, Water movement follows a path of decreasing water potential, from high potential in moist soil to very low (negative) potential in the dry atmosphere. This flow is often described using an analogy to electrical circuits (Ohm's Law), where flow rate is proportional to the water potential difference divided by the resistance. The major points of resistance, or bottlenecks, are air, plant, or soil. A lack of oxygen in the soil leads to a failure in water uptake by plant roots. Plant roots require oxygen to perform cellular respiration, which generates the energy (ATP) needed for the active transport of water and nutrients into the plant. Often from high RH for too long a period, , You must look for yourself and decide, make the adjustments. Ironically, a plant in waterlogged soil may exhibit symptoms similar to drought, such as wilting, because it is unable to take up the surrounding water. When soil becomes oversaturated (waterlogged), the plant's iron uptake is affected, leading to symptoms of iron deficiency known as iron chlorosis. This condition causes the leaves to lose their vibrant green color and become more yellowish green, a very early indication to me its more oversaturation than true drought, but you will have a much better idea. gluck

So sah eine meiner Pflanzen aus, die ich wegen zwittern aus dem Zelt getan hatte und zu faul war, mich direkt um die Entsorgung zu kümmern, nicht genug Licht und fehlende Nährstoffe, hatte just for fun einfach normales Wasser weiter gegossen um die zu beobachten, bis es mir zu blöd wurde.

I Agree with everyone else it's watering habits. Not enough probably

Wie alle Anderen hier schon bemerkt haben ist das kein N-Tox. Ich tippe auf Überwässerung. Diese Klauen an den Blättern kommen auch daher. Insgesamt kann man sich merken: hängen die Blätter runter und die Stiele sind schlaff = zu wenig Wasser, hängen die Blätter runter und Stiele sind steif = zu viel Wasser. 👽

I don't think that's N toxicity. Most likely it's either environmental or bad watering practices. Water slowly until you get a decent amount of runoff.

No. Why did you think it? I observe only excess/deficit in irrigation or overexposure of light

Not a N-tox. not dark enough. that tip curl is something else. some mottling with it, so maybe climate. direct, strong fan? not enough info... climate, possibly that heating pad under your pot -- if the grow is at a typical temperature, there's no need for the heating mat. just reducing O2 around roots. That woudl cause droop. Did oyu take the picture right when the lights turned on? this is all rhetorical. is the OF and coco brick mixed together? if not you need to irrigate based on a coco layer as it dries out faster. hopefully, it is mixed. Either case, stick to basic watering habits. fully saturate and wait for enough dryback before repeating. if there is a coco layer, assume it's ahead of the OF layer.

Kann es sein dass du falsch gießt? Dadurch wird die Nährstoffaufnahme durcheinander gebracht und behindert. Wie „nur“ Stickstoffüberschuss sieht es für mich nicht aus.