Distribution of Phosphorus Forms Depends on Compost Source Material
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Kuupäev
2021
Kättesaadav alates
Ajakirja pealkiri
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Kirjastaja
MDPI
Abstrakt
Composting is a sustainable method for recovering nutrients from various organic wastes,
including food waste. Every input waste has different nutrient contents, in turn, suggesting that every
compost has different fertilizer and/or soil improvement values. The phosphorus (P) concentration
and relative distribution of P forms is related to the original organic material. The relative distribution
of P forms determines how readily plants can absorb P from the compost-amended soil. The aim of
this study was to investigate the content and relative share of P forms in composts made from fish
waste, sewage sludge, green waste, and horse manure. Six forms of P (labile; bound to reducible
metals; bound to non-reducible metals; bound to easily degradable organic material; and bound
to calcium) were determined using sequential extraction method. The results indicated that fish
waste compost had relatively high proportion of labile P, suggesting good biological availability. In
comparison, sewage sludge compost contained the highest overall P concentration per dry weight
unit, while labile P constituted only 6% of summary of P forms. The results indicate that the
evaluation of composts as alternative P sources in agriculture should rely on the relative distribution
of P forms in the compost in addition to the typically recognized value of the total P.
Kirjeldus
Märksõnad
organic fertilizer, sequential fractionation, fish waste, manure, sewage sludge, green waste, circular economy, articles