Waste products as alternative phosphorus fertilisers part I: inorganic P species affect fertilisation effects depending on soil pH

| Type artikkel: Publisert studie
One of the bottlenecks to efficient phosphorus (P) recycling is limited understanding of the relationships between inorganic P species in waste products and their P fertilisation effects. In this study, we characterised inorganic P species in seven waste products (two biomass ashes, meat bone meal, fish sludge, catering waste and two food waste-based digestate products) and two manure products (dairy and chicken manure) by: (1) Sequential chemical fractionation, (2) X-ray powder diffraction and (3) solid-state 31P MAS-NMR spectroscopy.

Forfattere:

Eva Brod, Anne Falk Øgaard, Eddy Hansen, David Wragg, Trond Knapp Haraldsen og Tore Krogstad

År :

2015

Finansiering:

This work was supported by the research projects CenBio (Bioenergy Innovation Centre, Grant No. 193817) and Innovative utilization of wood ash (Grant No. 215935). Both are co-funded by the Research Council of Norway and research and industry partners.

We then used the characterisation data to explain the results of a bioassay studying the fertilisation effects of waste and manure products after application to a nutrient-deficient model soil that was limed to two pH levels (approximately pH 5.5 and 6.9 at pH level 1 and 2), with ryegrass (Lolium multiflorum) as the experimental crop. The P in waste products was mainly present as a complex mixture of inorganic P species, predominantly Ca phosphates with differing solubility. Fertilisation effects were largely explained by sequential fractionation data, with a positive relationship between apparent P use efficiency and the H2O-soluble inorganic P fraction at pH level 1 (R2 = 0.52) and a negative relationship between apparent P use efficiency and the HCl-soluble inorganic P fraction at pH level 2 (R2 = 0.66). X-ray powder diffraction and solid-state 31P MAS-NMR spectroscopy confirmed the sequential fractionation data, but provided little additional information.

 

Lenke: https://link.springer.com/article/10.1007/s10705-015-9734-1

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