Q.My Tangerine Tree
My tangerine tree has some yellow leaves. Does that mean too much water, not enough water, or needs fertilizer?

Certified GKH Gardening Expert
Unfortunately, your photos did not come through. I am unable to see the damage.
Unfortunately, also, this can be caused by over/underwatering, over/underfeeding, and lack of light. You will need to test all of these parameters to know, for sure.
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/test-soil-for-pests-and-diseases.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/making-sure-soil-drains-well.htm