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https://hdl.handle.net/1959.11/5009
Title: | Isotopic tracing of phosphorus uptake in corn from ³³P labelled legume residues and ³²P labelled fertilisers applied to a sandy loam soil | Contributor(s): | Nachimuthu, Gunasekhar (author); Guppy, Christopher (author) ; Kristiansen, Paul (author) ; Lockwood, Peter (author) | Publication Date: | 2009 | DOI: | 10.1007/s11104-008-9730-1 | Handle Link: | https://hdl.handle.net/1959.11/5009 | Abstract: | In low input (e.g. organic) farming systems where soil phosphorus (P) fertilisers such as superphosphate are not used, maintaining sufficient available soil P for plant growth can be a major challenge. The use of P accumulating cover crops may increase P availability for subsequent crops. We hypothesised that P release from organic residues of legumes (faba bean ('Vicia faba') and field peas ('Pisum sativum')) could supply adequate P to meet the needs of a subsequent crop in a low P soil. A pot experiment was conducted to determine the contribution of P by legume green manure to subsequent corn using ³³P labelled legume residues and ³²P labelled inorganic fertiliser (KH₂PO₄). The treatments included two rates of P application, (a) 10 kg P ha⁻¹ as legume root and shoot residues or as inorganic fertiliser with and without a C source, and (b) 38 kg P ha⁻¹as a combination of legume shoot and root residues or a combination of root and inorganic fertiliser and inorganic fertiliser alone. An absolute control (zero P) was also used. Shoot dry matter, P uptake and P source (residues or fertilisers) of total P in corn were measured at harvest. Faba bean and field pea residues alone or in combination with fertilisers contributed up to 10% and 5% of the total P uptake by corn respectively, compared with up to 54% by inorganic fertilisers. Incorporation of field pea and faba bean residues with P concentrations higher than those observed under field conditions, may not always lead to adequate net P release to supply the early growth phase of subsequent crops. | Publication Type: | Journal Article | Source of Publication: | Plant and Soil, 314(1-2), p. 303-310 | Publisher: | Springer Netherlands | Place of Publication: | Netherlands | ISSN: | 1573-5036 0032-079X |
Fields of Research (FoR) 2008: | 050304 Soil Chemistry (excl Carbon Sequestration Science) 070306 Crop and Pasture Nutrition |
Socio-Economic Objective (SEO) 2008: | 820401 Maize | Peer Reviewed: | Yes | HERDC Category Description: | C1 Refereed Article in a Scholarly Journal |
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Appears in Collections: | Journal Article School of Environmental and Rural Science |
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