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Boron is a trace element in ash
Plants' needs for the microelement, boron, are relatively small, but it is one of the biogenic elements that is very important for plants because it affects the yield, thanks to the fact that it promotes fertilization.
Ok, that sounds sensible and makes sense, which is why the fields used to be flamed after the harvest. They don't do that here anymore, but I've seen it in Croatia.
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