I had a similar problem with my avocado plants and I posted a question here
https://www.plantvillage.com/posts/14...
Have a read through the answers that were provided, they were very detailed and helpful and hopefully the advice will aslo help you with your problem which I think is the same as the one I experienced.
This was one of the answers from Pam Dunker:
"Avocado plants in pots are very susceptible to leaf tip burn from either sodium or chloride salts, far more so than many other plants, so other plants receiving water from the same source may not show any signs of stress. Compounding the problem is the fact that in potted plants the water cannot dissipate into surrounding soils as when planted in the ground. Another contributing factor is that most potted plants will never attain the size of outdoor plants and smaller plants - because they are smaller - cannot distribute water soluble nutrients and minerals across more plant material so the presence of salts may appear to cause more widespread damage. Some varieties are more prone to salts than others but all avocados share this sensitivity".
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