How much hormone will be retained in the FPJ with skins/rinds usually? We don't want the young trees to be affected by the matured skins FPJ. TQ  

Tq sir for your quick response.
Laying the durian skins is a good idea but most of our trees are still young(< 6 mths old). That's why we want to FPJ most of the skins.
And make use of the drip irrigation injectors to spread. Worried also on blockage of emitters if not filtered properly.
We don't need to make a lot as the usage is small & we can FPJ as we run out. We irrigate water every 2-3 days for now, slow drip for 1-2 hrs every cycle.  

JLF made from durian shells provides optimal nutrition for growing durians. I think it can be diluted 20 times or more and used throughout the growing season.

It would take a lot of bowls and labor to make and use the durian skins that occur so much in JLF. If possible, I think the method of laying under the durian tree can be considered.