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https://hdl.handle.net/2440/127305
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Type: | Journal article |
Title: | Soil phosphorus pools with addition of fertiliser phosphorus in a long-term grazing experiment |
Author: | McLaren, T.I. Smernik, R.J. McLaughlin, M.J. McBeath, T.M. McCaskill, M.R. Robertson, F.A. Simpson, R.J. |
Citation: | Nutrient Cycling in Agroecosystems, 2020; 116(2):151-164 |
Publisher: | Springer Nature |
Issue Date: | 2020 |
ISSN: | 1385-1314 1573-0867 |
Statement of Responsibility: | Timothy I. McLaren, Ronald J. Smernik, Michael J. McLaughlin, Therese M. McBeath, Malcolm R. McCaskill, Fiona A. Robertson, Richard J. Simpson |
Abstract: | Grasslands are a globally important use of land for food and fibre production, which often require the addition of phosphorus (P) fertiliser to maximise plant production. However, a large proportion of the added P can accumulate in pools of poorly available inorganic and organic P in the surface soil layer under grasslands. The aim of this study was to identify the chemical nature of the organic P in soils from a long-term fertiliser by grazing permanent pasture experiment that have received varying additions of phosphatic fertiliser (cumulative P input of 27, 169, 311, 513, 745 and 1035 kg P ha⁻¹) over a period of 37 years. The design of the experiment uniquely provides insight into the response of soil organic P to the addition of fertiliser P on the decadal scale. On average, 46% of the added fertiliser P was recovered as total P in the 0–100 mm soil layer after 37 years of phosphate addition. The content of both inorganic and organic forms of soil P increased with the addition of fertiliser P. The accumulation of organic P increased linearly up to a cumulative P input of 745 kg P ha⁻¹ and plateaued thereafter. The majority of organic P in all treatments was detected as a broad signal in the phosphomonoester region of solution ³¹P nuclear magnetic resonance (NMR) spectra; this also accounted for 79% of the accumulated organic P in fertilised soil. Our results indicate that accumulation of P in the organic portion as complex forms eventually reaches a new equilibrium where no net accumulation would be expected with further addition of phosphate. |
Keywords: | Fertilizer; HLTPE; grasslands; NSP; phosphorus cycling; speciation |
Description: | Published Online 8 November 2019 |
Rights: | © Springer Nature B.V. 2019 |
DOI: | 10.1007/s10705-019-10035-y |
Published version: | http://dx.doi.org/10.1007/s10705-019-10035-y |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest 4 |
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