Q.Avocado Tree Leaves Turning Yellow
Good day, it has been very hot this year; we have had a drought and the leaves of my avocado are turning yellow. It is a young tree about 4 meters high and has not had fruit yet.

Certified GKH Gardening Expert
If the veins in the yellowing leaves are green, you may need to feed the tree with an iron-rich fertilizer. If the leaves are turning completely yellow, the tree may be lacking nitrogen. You may want to test your soil and see if its lacking in either of these elements. Make sure you remove any dead leaves, stems and debris around the plant. You will also want to examine the leaves and stems closely for insects and other possible problems, which are described in this article.
https://www.gardeningknowhow.com/edible/fruits/avocado/avocado-pests-and-diseases.htm