Hi Waira, seems like it should work. Found this analysis. Basically  0-3-63. I would mix a bunch of ash with boiling water and allow it to  sit and settle for 24 hours and then pour off the liquid. Potassium  compounds are all highly soluble in water. Start with a teaspoon of the  liquid per gallon of water. I think this would allow much better control  of the amount the plants were getting and also help reduce some the  heavy metals that are present vs. sprinkling on the soil. Have a good  one
[TABLE="class: cms_table"]
[TR]
[TD="width: 11%"]Table 1
: Analysis of Coconut Husk Ash. Compound [/TD]
 [TD="width: 11%"]P2O5 
[/TD]
 [TD="width: 11%"]SiO2
[/TD]
 [TD="width: 11%"]SO3 
[/TD]
 [TD="width: 11%"]K2O 
[/TD]
 [TD="width: 11%"]CaO 
[/TD]
 [TD="width: 11%"]TiO2
[/TD]
 [TD="width: 11%"]V2O5 
[/TD]
 [TD="width: 11%"]Cr2O3 
[/TD]
 [/TR]
 [TR]
[TD="width: 11%"]% Composition 
[/TD]
 [TD="width: 11%"]2.6 
[/TD]
 [TD="width: 11%"]17.9 
[/TD]
 [TD="width: 11%"]1.4 
[/TD]
 [TD="width: 11%"]62.43 
[/TD]
 [TD="width: 11%"]8.76 
[/TD]
 [TD="width: 11%"]0.73 
[/TD]
 [TD="width: 11%"]0.007 
[/TD]
 [TD="width: 11%"]0.11 
[/TD]
 [/TR]
 [TR]
[TD="width: 11%"]Compound 
[/TD]
 [TD="width: 11%"]MnO 
[/TD]
 [TD="width: 11%"]Fe2O3 
[/TD]
 [TD="width: 11%"]NiO 
[/TD]
 [TD="width: 11%"]CuO 
[/TD]
 [TD="width: 11%"]BaO 
[/TD]
 [TD="width: 11%"]ZnO 
[/TD]
 [TD="width: 11%"]MoO3 
[/TD]
 [TD="width: 11%"]Re2O7 
[/TD]
 [/TR]
 [TR]
[TD="width: 11%"]% Composition 
[/TD]
 [TD="width: 11%"]0.11 
[/TD]
 [TD="width: 11%"]4.65 
[/TD]
 [TD="width: 11%"]0.087 
[/TD]
 [TD="width: 11%"]0.089 
[/TD]
 [TD="width: 11%"]0.48 
[/TD]
 [TD="width: 11%"]0.12 
[/TD]
 [TD="width: 11%"]0.3 
[/TD]
 [TD="width: 11%"]0.1 [/TD]
[/TR]
[/TABLE]