Q.Soil Becoming Really Dry And Hard Citrus Are Big Not Turning Yellow
My citrus trees were normal before, and I don’t know what happened. please help

Certified GKH Gardening Expert
It sounds like your soil is heavy clay based. This will need to be amended. Since the trees are already established, this might be a little more difficult.
Adding good composted mulch and, either, putting earthworms or other creatures that improve soil.
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/improve-soil-with-native-plants.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/how-to-condition-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/plants-that-improve-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/how-to-improve-clay-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/improving-compacted-soil.htm