dwarf lemon tree
the trees leaves are falling off. also notice the soil has yellow in some parts. what do I do?

This article will help you find the cause of the dropping leaves:
https://www.gardeningknowhow.com/edible/fruits/lemons/lemon-tree-leaf-drop.htm
I am not sure what could cause the soil to turn yellow- perhaps it's a mold that could be scraped off?
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