Q.Why Are Some Leaves On My Lemon Tree Light Green
Is there something wrong with my lemon tree?
Certified GKH Gardening Expert
This is common with, both, iron and nitrogen deficiencies. It can also present itself when pH is far out of range, usually, too alkaline.
Be sure to test your soils and feed with fertilizers that are designed for citrus. This will, typically, be a little on the acidic side.
https://www.gardeningknowhow.com/edible/fruits/lemons/learn-about-fertilizer-for-a-lemon-tree.htm
https://www.gardeningknowhow.com/edible/fruits/lemons/growing-lemon-trees-containers.htm
https://www.gardeningknowhow.com/edible/fruits/citrus/growing-citrus-trees-indoors.htm
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