I have four citrus plants, but the clementine seems to have a problem. For the longest time, it didn't get any new growth, and most of the old growth seemed fine, but there was a little bit of new growth that was kind of yellow. Now there is a lot of new growth coming, and it all seems a little yellow, not light green like it should be. I fertilize weakly every time I water, and I treat them all the same (I don't water them all at the same time, I just water when it seems dry enough when I stick my finger in the soil). It's still in the pot and soil it came in, but the soil seems kind of gritty. The other three are fine. What could this be?

Most new growth comes out a very light greeen. It will get darker once it starts absorbing some sun

It's more yellow than green, and should have grown by now. The new growth is stunted, also.

Thank you TRI. I hope that's it!