If you're positive it's nitrogen burn, flush with 1-2 times the volume of the pot with properly ph'd water. Recovery takes a week or so. Watch the new growth, as the burned leaves won't heal. (old leaves are old news) Adjust your nutrient schedule or dosage.

If you're guessing that it's from nitrogen OD, filling out the form and providing a picture would be a benefit.
Rusty Trichome Reviewed by Rusty Trichome on . nitro toxicity problem help I am in 2days of the 3rd week of flowering, and i am having the nitro toxicity . I am growing in soil, I have a 1000watt hps on it now , and everything was fine till 2 days ago. How do i fix it? by flushing ? I have looked at other posts and cant find the answer i am looking for Help please have a greatful day . Rating: 5