Will Lychee fruit at 1,500 feet above Hilo, Hawaii?
I'm no expert; I don't live in Hawaii yet but found information about lychees on this nursery's web site
[quote]Lychee is quite adaptable in its soil requirements but prefers a moist rocky soil. It needs high humidity and abundant rainfall. You can see beautiful fruiting specimens from about sea level in the Hilo area up to about 1,000 feet.[/quote]
Now that tells me that it probably won't fruit or fruit well at 1500 ft.
You might also consider longan. According to the same website they bear up to 2000 ft in the islands. They are simular to lychees but taste a little different (they also have a nice flavor though).
"Longans are usually eaten fresh but are also dried and canned. It is a delicious, juicy fruit with a very sweet and pleasant musky flavor.
It is a large spreading tree, which bears many clusters of golden-brown- skinned fruit at the ends of the branches. The juicy white fruit is about the same size as the lychee with one black shiny seed.
It does well in most areas of Hawaii below 2,000 feet if provided with abundant water."
Sorry to keep on posting but I've found some real good stuff. Here are 2 papers from the University of Hawaii on lychees. Sorry, but I don't know how to make the links clickable on this forum.
I have a four year old abiu tree in Hilo at 1,500 ft. It has abudant flowers twice a year in 2005-2006 but no fruit develops. Cause? I have limed it and fetilyzed it with 10-30-10 regularly.
Maybe test your soil to see if the treatments are appropriate. Could be overdoing one thing (that 30 for the P is pretty high) and/or not putting on enough of another. Don't know how this tree works but with other fruit trees common problems are lack of cross-pollination and lack of suitable pollinators at flowering time. If you are convinced there is a nutrient deficiency that might perhaps cause flowers or developing fruits to abort (again talking about these things generally, not based on something known about this particular tree specifically).
Here is a link that might be useful: Agricultural Diagnostic Service Center Homepage