This plant is 3 weeks old growing in a 4x4 tent under 24/0 400w HPS. The temp is at a steady 77. The top growth leaves have started yellowing on the edges and the bottom older growth seems to be slightly droopy. I'm not over watering. I water around every 3 days when its dry. The plant is in a 2.5 gal pot. The picture of the plant not under HPS was from yesterday. It has gotten significantly worse. The ph is a bit too acidic but I am unsure on how to change it. I water with water with the ph of around 7.2. I don't use any nutes.
Its in its final pot so I cant really mix dolomite lime into the soil. I have checked and no where sells hydrated lime anywhere near me. Will the dolomite lime help at all?
I mean a 24/hr light cycle could explain your issue, it is possible to over dose your plant with too much light. It looks like heat stress and depending on how far your light is from the canopy it could be too much for the little guy. The plant leaves will also curl up when it is too hot and the humidity is too low. Basically the water in the leaves is being pulled forcefully through the veins when you speed up transpiration. Try adding more fans into your grow room. Circulation will help with that issue. Side note you can make soil less acidic by transplanting in a medium that has dolomitic lime mixed in it. This can be bought at most home and garden store (i.e. Home Depot, Lowes)
oh god yes! that sounds like the issue, there isn't enough water in the system. Trying using a humidifier, wet towel, spray bottle, tray of water in the tent. Rule of Thumb: Seedling/Clone = 80-90% Humidity Veg = 70-60% Humidity Flower = 40-60% Humidity I tend to go towards the lower sides of those percentages. Proceed with caution when using a humidifier, without enough circulation any temp under 76 F and above 50% humidity can cause bud mold and ruin the harvest.
The humidity is not the issue... It will help to increase it, however. I have my plants in a constant 30-40% in the low 80s.... My plants LOVE it. and you should see how lush they are. How far is your HPS from the plants? Looks like a temp/light related stress in terms of the leaves folding up like that. Sent via THC injection.
Btw 7.2 is not too acidic. That's way too alkaline (opposite of acidic). The yellowing can be due to nutrient lockout. Start watering with pHd water to 5.5-6.5. Use lemon juice as an acid to lower ph. Test after you've used some and judge what you need. Sent via THC injection.
Okay so your soil is too acidic and you're having nutrient lockout, continue watering with the 7.2 until your runoff gets to about 6.0. Sent via THC injection.
Also I followed some of your grow. I have an auto seedling that looks the same as your strange auto seedling currently.
Don't add lime unless you'd like to increase your acid concentration. You want to add something ALKALINE if anything. Not acidic. Edit: if you're referring to limestone then yes. But not lime. Sent via THC injection.
Yeah I went back and edited that. I was a little confused my bad. lol. Yeah let me see that bugger Sent via THC injection.
It happened to mine because the seed shell got stuck on the top and made it grow weird. My other new seedling is doing fine though And my other new seedling at normal growth Sent from my iPhone using Grasscity Forum mobile app
Did you pull off the shell? That's wild. The first leaves that appeared out of mine had heavy trichomes and were a weird texture. Crazy phenos. Lol Sent via THC injection.
Yeah I pulled the shell off and it didnt start to spread out for like 3 days. That seedling is pretty much fucked since its already stunted and an auto. But I guess I will keep it and see if I can get a few grams from it.