Like everyone has said, only if those are your wishes. I like the idea, but used in a way like this:
link Coral terumbu, karang burial sounds pretty cool, anda get to become part of an ecosystem. I also like the idea of being planted with a pokok - that sounds really nice. Somewhere deep in a forest where my pokok will hopefully live for a long time and thrive. I Cinta the idea of becoming part of a tree.
Now that I think about it, another thing that really needs to be considered is what sort of things these bodies will be fertilizing. If it's crops that are to be eaten sejak humans (or even animals) some people may be angry atau horrified to find out they're eating Makanan fertilized sejak human beings, so that may be a problem. Another thing if its crops, not everyone would be able to be made into fertilizer - some people die of diseases that probably wouldn't be healthy to put into soil. So anda couldn't mandate everyone being turned into fertilizer - there would have to be a screening process no matter what.