Received: September 10th, 2021 ; Accepted: November 5th, 2021 ; Published: November 19th, 2021 ; Correspondence: [email protected] obtained from biomass combustion could be a valuable product for fertilisation of
soil or/and plant. It is connected with high reaction and potassium, calcium, magnesium content
as well as low content of heavy metals. The analysed phyto-ash was obtained from Szczecin
Power Plant Poland (12.2018–12.2019). The samples of phyto-ash, in the number of 24, were
collected on subsequent dates at two-week intervals to determine the total content of the analysed
elements (P, K, Mg, Ca, As, Cd, Ni, Cr, Pb, Hg). The differentiated percentage share of macroelements both in total form as well as available form in ash from wood biomass and Agro-biomass
is described as: calcium > potassium > magnesium > phosphorus. Phosphorus is characterised by
a very low (10%) and highly variable availability. Ash from biomass is characterised by alkali
pH (13.0). Biomass ash can be treated as a mineral fertiliser used for soil deacidification and as a
substitute for calcium fertilisers. Biomass ash has a high content of potassium and magnesium,
which could qualify this by-product as a source for fertiliser. Mean contents of heavy metals:
lead, cadmium, arsenic and mercury in ash do not exceed the limit values for the mineral
fertilisers. The variable percentage share of Agro-biomass did not result in significant changes in
the amount of available form of macro-elements in ash. The obtained results indicate the
pronounced variability, depending on the season in a year, of the content of available macroelements in biomass ash
