Abstract
Additions of enzymes involved in organic phosphorus (P) hydrolysis can be used to characterize the hydrolyzability of molybdate-unreactive P (MUP) in soil water extracts. Our aim was to test the feasibility of enzyme additions to soil water suspensions with respect to (1) suitable enzyme preparations and (2) recovery of molybdate-reactive P (MRP). To this end, we compared the substrate specificity of seven commercially available enzyme preparations (acid and alkaline phosphomonoesterase, phytase, and nuclease preparations) and optimized the assay conditions in microplates. We then measured MRP release after the addition of the enzymes to soil water suspensions and filtrates of two Swiss grassland soils (midland and alpine). In some cases, commercial preparations of the same enzyme differed in their specificity, presumably due to contamination with other enzymes, and also in their efficiency in soil suspensions. Addition of EDTA to the buffer was required to decrease sorption of released P in soil suspensions. Enzymatic release of P was consistently equal or higher in soil suspensions than in soil filtrates. However, also more dissolved MUP was present in soil suspensions than in filtrates, since the buffer interacted with the solid phase. Of the total dissolved MUP in soil suspensions, 94 and 61 % were hydrolyzable in midland and alpine soil, respectively. More specifically, 60 and 17 % of MUP were in nucleic acids, 6 and 39 % in simple monoesters, and 28 and 5 % in inositol hexakisphosphate in midland and alpine soil, respectively. Thus, we show that the characterization of hydrolyzable organic P in soil suspensions with hydrolytic enzyme preparations may be useful to better understand the availability of soil organic P to enzymatic hydrolysis, but that it requires soil-specific adaptation for optimum P recovery.
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Acknowledgments
We thank Arne Korsbak from Novozyme (DSM Nutritional Products) and Roland Betz from BASF (Ludwigshafen) for the supply of Phytase I and II, respectively. Olivier Huguenin-Elie (ART Reckenholz) kindly provided access to the Watt field site and Julia Coffin did language corrections on the manuscript. This study was conducted within a project funded by the Swiss National Science Foundation.
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Annaheim, K.E., Rufener, C.B., Frossard, E. et al. Hydrolysis of organic phosphorus in soil water suspensions after addition of phosphatase enzymes. Biol Fertil Soils 49, 1203–1213 (2013). https://doi.org/10.1007/s00374-013-0819-1
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DOI: https://doi.org/10.1007/s00374-013-0819-1