Wy is volcano ash as good as ferilizer for cultivation?
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Answers:
It's not really a complete fertilizer; volcanic ash typically contains quite a bit of potassium and some phosphate, but contains no nitrogen. It also contain a wide range of trace minerals; sometimes containing fluorine in toxic quantities.
It can be a valuable addition to soils that are deficient in the minerals it contains, but shouldn't be relied on for complete fertility - and it shouldn't be used in very large amounts.
If you mean why, volcanic ash is made of lots of minerals which break down and become usable for plants. Many areas on the west coast of the US and other areas of the world where there has been volcanic activity are excellent for fruit, nut and olive trees as well as vegetable production.
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