Beginner Gardening: New Pomegranate tree turning yellow, dropping leaves..??, 1 by Mutai

Mutai wrote:
Hey! So my pomegranate was getting watered multiple times a week as well, causing many leaves to turn yellow and die. I have now fixed that so my sprinkler will go off once a week in that area.
I have an additional question - even the healthier leaves on the plant are a lighter green than when I got the plant (see pictures) i read somewhere that it could be a nitrogen deficiency. I\'m not sure if I should apply some right now or wait till spring. Any thoughts?

It was planted around late August 2020 and it gets full sun all day. Since my yard only has about 5 inches of top soil before I hit clay, I planted it in this raised mound to give it more room and hopefully better drainage.