Issue with Centennial Kumquat
 

I have a centennial kumquat and the leaves are curling. I do not see any signs of any pests on the tree. I had added some evergreen soil conditioner to the top of the potting soil for mulch/soil acidifying effect a couple weeks ago. It was being watered daily overhead and I am thinking the over-watering caused this but wanted to confirm it wasn't something else. I am going to be planting this in the ground in the near future but would like to know what the problem with it is first. Any suggestions?

Re: Issue with Centennial Kumquat
 

My guess is over watering as well. I wouldn't change anything until it recover so you can narrow down the issue..