Abstract
Background and Aims
Phosphorus (P) mineralisation from crop residues is usually predicted from total P or carbon: phosphorus (C: P) ratios. However, these measures have limited accuracy as they do not take into account the presence of different P species that may be mineralised at different rates. In this study P speciation was determined using solution 31P nuclear magnetic resonance (NMR) spectroscopy to understand the potential fate of residue P in soils.
Methods
Mature above-ground biomass of eight different crops sampled from the field was portioned into stem, chaff and seed.
Results
The main forms of P detected in stem and chaff were orthophosphate (25–75 %), phospholipids (10–40 %) and RNA (5–30 %). Phytate was the dominant P species in seeds, and constituted up to 45 % of total P in chaff but was only detected in minor amounts (<1 %) in stem residue. The majority (65–95 %) of P in stems was water-extractable, and most of this was detected as orthophosphate. However, this includes organic P that may have been hydrolysed during the water extraction.
Conclusions
This study indicates that the majority of residue P in aboveground plant residues has the potential to be delivered to soil in a form readily available to plants and soil microorganisms.
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Abbreviations
- C:
-
Carbon
- N:
-
Nitrogen
- NaOH-EDTA:
-
Sodium hydroxide ethylenediaminetetraacetic acid
- NMR:
-
Nuclear magnetic resonance
- P:
-
Phosphorus
- RNA:
-
Ribonucleic acid
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Acknowledgements
The authors thank the Grains Research and Development Centre (GRDC) for providing funding to support this research (DAV00095) and the University of Adelaide for the James Frederick Sandoz Scholarship.
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Noack, S.R., McLaughlin, M.J., Smernik, R.J. et al. Crop residue phosphorus: speciation and potential bio-availability. Plant Soil 359, 375–385 (2012). https://doi.org/10.1007/s11104-012-1216-5
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DOI: https://doi.org/10.1007/s11104-012-1216-5