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|Title:||Phosphorus speciation in mature wheat and canola plants as affected by phosphorus supply|
|Citation:||Plant and Soil, 2014; 378(1):125-137|
|Sarah R. Noack, Mike J. McLaughlin, Ronald J. Smernik, Therese M. McBeath, Roger D. Armstrong|
|Abstract:||Background and aims: As plants approach maturity and start to senesce, the primary sink for phosphorus (P) is the seed but it is unclear how plant P status affects the resulting P concentration and speciation in the seed and remaining plant parts of the residues. This study was established to measure how P speciation in different parts of wheat and canola is affected by plant P status. Methods: Wheat and canola grown in the glasshouse were supplied three different P rates (5, 30 and 60 kg P ha−1 equivalent). At physiological maturity, plants were harvested and P speciation was determined for all plant parts (root, stem, leaf, chaff/pod and seed) and rates of P application, using solution 31P nuclear magnetic resonance (NMR) spectroscopy. Results: Phytate was the dominant form of P in seed whereas orthophosphate was the dominant form of P in other plant parts. The distribution of P species varied with P status for canola but not for wheat. The phytate content of wheat chaff increased from 10 to 45 % of total P as the P rate increased. Canola pods did not show a similar trend, with most P present as orthophosphate. Conclusions: Although minor differences were observed in P speciation across the three P application rates and plant parts, the effect of this on P cycling from residues into soil is likely to be relatively minor in comparison to the overall contribution of these residues to soil P pools. This glasshouse experiment shows the dominant P form in crop residues that is returned to soil after harvest is orthophosphate, regardless of plant P status.|
|Keywords:||Phosphorus; Plant P status; Residues; Speciation; Organic P; Inorganic P|
|Rights:||© Springer Science+Business Media Dordrecht 2014|
|Appears in Collections:||Agriculture, Food and Wine publications|
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