If you use this recipe they will be supersweet i guess, i never tried the full recipe though.
AGE OF TREE
DOSAGE / GRADE
METHOD / FREQUENCY
1-year-old (2-3 feet)
60 grams (6 tablespoons) of 16-20-0, urea mixture and trace element
Mix 3 parts of 16-20-0 and 1 part urea. Apply after one month from date of planting and repeat application after 2-3 months
2-year-old (4-5 feet)
150 grams of 16-20-0, urea mixture and trace element
Mix 3 part of 16-20-0 and 1 part urea. Apply at the start of rainy season. Repeat after 2-3 months
3-year-old or more
300 grams of 14-14-14, urea mixture and trace element
Mix 3 part of 14-14-14 and 1 part urea. Apply at the start of rainy season and repeat procedure after 2-3 months
Bearing tree
1 to 5 kilos of 14-14-14 (depending on the size of the tree)
Apply at the start of rainy season and after 3 months
Flowering Post Blossom
1/2 kilo of 17-0-17 every 10 kilos estimated fruit
Dosage shall depend on the estimated yield or production of the tree
Two Months Before Ripening
17-0-17 (1 part), 0-0-60 (1 part)
Mix thoroughly 17-0-17 and 0-0-60 and apply 1 kilo for every 10-kilo fruit. Apply more on less fertile soil or 1.5 kilo for every 10 kilos of fruit.
http://www.dizonexoticfruittrees.com/ref/fer02.htm