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Crop residue phosphorus: speciation and potential bio-availability.
- Source :
- Plant & Soil; Oct2012, Vol. 359 Issue 1/2, p375-385, 11p
- Publication Year :
- 2012
-
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 P 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0032079X
- Volume :
- 359
- Issue :
- 1/2
- Database :
- Complementary Index
- Journal :
- Plant & Soil
- Publication Type :
- Academic Journal
- Accession number :
- 80032053
- Full Text :
- https://doi.org/10.1007/s11104-012-1216-5