I am sorry for this delayed reply to your gardening question. The spring rush has brought a deluge of questions and we are working hard to catch up!
Go ahead and fertilize the kumquat just don't overdo it. It should bloom in time and then set fruit. The reason for the mealy fruit is most likely that they were overmature and would have been better if harvested a little earlier.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
Q&A Library Searching Tips