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Title: An assessment of various measures of soil phosphorus and the net accumulation of phosphorus in fertilized soils under pasture
Contributor(s): McLaren, Timothy (author); Simpson, Richard J (author); McLaughlin, Michael J (author); Smernik, Ronald J (author); McBeath, Therese M (author); Guppy, Christopher (author)orcid ; Richardson, Alan E (author)
Publication Date: 2015
DOI: 10.1002/jpln.201400657
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Abstract: Phosphorus fertilizer use efficiency of pastures is often low because P accumulates in soils as sparingly-available forms of inorganic and organic P. The aim of this study was to use sequential chemical fractionation to identify which forms of P have accumulated in soil under permanent pasture from a medium-term (13 y) field experiment. Treatments included an unfertilized pasture (P0), and treatments designed to maintain soil P fertility at near 'optimum' (P1) and 'supra-optimum' (P2) levels for pasture growth; all levels of soil P fertility were continuously grazed with either a moderate or high stocking rate (SR09 and SR18). Summed concentrations of extractable inorganic and organic P, and residual P (i.e., non-extractable P) accounted for 20, 31, and 49% of total soil P (as determined by laboratory X-ray fluorescence), respectively, across all surface (0-10 cm) and subsurface (10-20 cm) soil layers. A large proportion of extractable inorganic and organic P was contained in the NaHCO3 and NaOH soluble fractions across all surface soil layers, and these fractions were also the most important sinks for fertilizer P. The accumulation of organic P appeared to plateau with increasing fertilizer addition, whereas inorganic P continued to increase. The majority of the P that had been applied as fertilizer (70%) was recovered in the surface soil layer (0-10 cm). Approx. 31 and 30% of the added P was recovered in the summed concentrations of extractable inorganic and organic P, respectively, of the surface soil layer at the optimum (P1) agronomic level of soil P fertility.
Publication Type: Journal Article
Source of Publication: Journal of Plant Nutrition and Soil Science, 178(4), p. 543-554
Publisher: Wiley-VCH Verlag GmbH & Co KGaA
Place of Publication: Germany
ISSN: 1436-8730
Field of Research (FOR): 050304 Soil Chemistry (excl. Carbon Sequestration Science)
070306 Crop and Pasture Nutrition
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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