I think nitrogen deficiency is unlikely. I think it might be over or under watering. Why do you thinh it is over watering?

Thanks Vladimir. Lately we planted some shrubs nearby which required lot of irrigation. Wondering if that had caused overwatering to the adjacent tangerine?

Pick the fruits to relieve the load off the tree if there ripe to near ripe. You can foliar feed your tree with something like Miracle Gro 24-8-16 or use. Irrigation? Are you in desert country. If your dog possess super powers you might want to stop it from staring at the tree

Steve

thx poncircusguy. will try that.

It certainly could be nitrogen deficiency, how often do you fertilize the tree? Could also have some root problems.