So since starting my citrus seedlings approx 8 months ago I used a CRF as I heard it is easier to avoid burning your plants. Specifically I used lutz citrus tabs and have been very happy with them. (I did experience some leaf burning when I sprayed them with SAG citrus spray and have not done that again).

Although I saw no signs of deficiency, I decided to try using FP on 5 (out of my ten) trees because I've noticed that many people on this forum seem to use it with great success and I wondered if my trees could be doing even better. After reading a few of the older posts re proper dosing, I added 2t to a 2.4 gallon watering can along with 3 t of vinegar.

Unfortunately, a few days later there was clear signs of leaf burn on 3 of the trees and one with a lief deformity. Clearly I did something wrong. But the thing is, from the little I read here, I thought I had given a fairly conservative amount and I've definitely heard that people are using FP in conjunction with CRFs. Any thoughts from those with more experience?

(The plants are in promix HP with added perlite and planted in airpots.)