On 2nd February 2012, I modifying the fertilize program by applying single element fertilizer - Ammonium Sulphate (AS) with approximate 900 to 1200 grams per tree rather than mixture of element fertilizer roughly 600 to 800 grams per tree mention earlier.
This approach, in theory, each plant should have same amount of AS element fertilizer applied relative to mixture of element fertilizer.
So theoretical speaking, the leaf will be softer and easy to harvest in coming harvest cycle.
Forth night later, strong wind and heavy rainfall that causes 40% of the palm tree leaves broken, and some even whole trunk fall down. I believe this is due to access apply of Ammonium Sulphate.
As long as the leave still intact with the plant, its' still fine, photosynthesis still take place, nevertheless it create difficulties on coming harvest. On the other hand, even the palm tree trunk fall down, it will take time to recover back to the norm.