Young/small avocado trees are sensitive to intense sun. They need to be sheltered with shadecloth to filter that. Usually the yellow leaves are reflected from lack of nutrients or too much water. Keep in mind...corrective action takes awhile to show results. Avos love water...just not standing water/brackish conditions.

Thank you very much!

I will reduce the watering.

What type of nutrients do you recommend?

I already gave it regular all purpose plant food. Two days ago.

Think about an Avocado grove. Each tree shades the other at certain times of the day. East facing trees get morning shade until the sun goes high, then they all get sun. As the sun drops to the West, shade begins on the west side of the trees. I'd shade that tree partially. Put up some shade cloth or something. I know you are in the Mid East. Desert like conditions.