I’ve had this Meyer lemon for just over a year (potted). Last year was very healthy and got a few lemons off. This year we had some new growth but it suddenly stopped and the leaves started turning yellow and dropping. I did some research and read nitrogen deficiency Could be the cause. I used some Earth Juice to increase the nitrogen. The ph is currently 5.5-6.5. I live in Colorado and the weather has just become warm enough to move the tree outside. I am not sure if it is the fertilizer that is causing the leaves to turn white or what. Any help is appreciated.