Hi, I have a 15 years old nagami kumquat tree that put out below average size fruits. Part of it is my fault because I didn't water or fertilize it for like 4 years. In 2010, I nourished the tree back to health with dark green leaves and it reaches height of 10 feets and 5 feet all around. It has no sign of disease and maybe the best looking citrus in the neighborhood. The only problem is that it put out smaller fruits. I pretty did everything to make the tree happy. 2 inches of mulch; 6-8 hours of sunlight; fertilize it: urine, vigoro citrus food, azomite, cotton seed meals, compost soup, etc. anybody has luck increasing citrus fruit size? thanks.

It sounds like you are using too many different fertilizers, then you do this you really loose control over whats going on. I would recommend using ONE complete fertilizer something like Osmocote indoor/outdoor 19-6-12 or if you are into organic Espoma citrus tone, supplement with compost tea every month or so. Also you can remove some fruit, this will help boost the size of the remaining fruit. BTW, don't use urine, it can have a negative effect on PH among others things...

cool. thanks....

Also, the more fruit the tree holds the smaller they will be.