My pecan started getting brown tips on the leaves at the end of it’s growing season the year before last and it’s progressed to the emerging spring leaves.
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It pecan’t.
Possibly a potassium deficiency. Potash additives could help to address that, but there are a number of products that can increase the available K.
I have ash from my tile fire that we use to warm the house and cook bones from meals in. Will that do?
I also have a detailed reply to Seleni here regarding it’s environment: https://aussie.zone/comment/13041834
That will help, generally wood ash is about 5 percent potassium. Don’t overdo it and try to fix it with one application - you could alter the pH in the immediate root zone in a way the pecan won’t appreciate.