hey every one, I’m new to the form and this is my first ever grow so I would really appreciate any advice/help. My babies are 33 days old rn. I’ve been growing in Fox farm ocean forest soil, ph Is 6.4, temp 75, RH 46-50%, growing auto flowers. I’ve had no problems up until about a week ago I noticed leaves starting to curl and claw at the tips. later started getting these brown spots, drying out, and looking burnt on the tips and edges. I tested the runoff and one was 1800ppm and the other 1200ppm. Thinking that was way to high for veg I flushed them yesterday. I was thinking a possible nitrogen toxicity at first but I’ve fed nothing but straight phd water the whole grow. I’ve been doing a lot of research and potassium And phosphorous deficiencies look very similar but I don’t want to add any if that’s not the problem seeing aa the ppm was already high but It i think its still progressing. I’m gonna have to keep monitoring them. Sorry for the really long post but if anyone more knowledgeable can help I would greatly appreciate it. Thank you.
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Have you given them any other food besides the soil mix? Can you upload a picture so I can see the size of your plants? It will help me determine how much of the food they may have used. I also need to know the size of your pot. Typically plants grown in preloaded soil will have used most of what they need by the 30 day mark. If you have excessively high ppms in your tap water these compounds can build up in the soil over time and cause issues with high readings too.