I am using Vitax Citrus feed for summer which has 25.15.15. The nitrogen is broken down to 4.3% nitric nitrogen, 4.1% ammoniacal nitrogen and 16.6% ureic nitrogen. I use it once a week and water every two or three days in this dry weather. The tiny fruitlets are still dropping off as fast as the new flowers come into bloom :(.
Tricia