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https://hdl.handle.net/2440/109631
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Type: | Journal article |
Title: | Phosphorus distribution in soils from Australian dairy and beef rearing pastoral systems |
Author: | Adeloju, S. Webb, B. Smernik, R. |
Citation: | Applied Sciences, 2016; 6(2):1-19 |
Publisher: | MDPI AG |
Issue Date: | 2016 |
ISSN: | 2076-3417 2076-3417 |
Statement of Responsibility: | Samuel B. Adeloju, Benjamin Webb and Ronald Smernik |
Abstract: | The influence of soil type and management practices on P distribution in soils from Australian dairy and beef rearing pastoral systems has been investigated by chemical measurements and phosphorus-31 (31P) nuclear magnetic resonance (NMR) spectroscopy. The amount and forms of P within the soil profile varied with soil type, with the acidic red Ferrosols containing relatively high orthophosphate concentrations, averaging 72.2% compared with 66.8% for Dermosols, under similar management conditions. Soil from Sodosol sites which received less fertiliser P addition had the lowest orthophosphate concentration with only 57.6%. In contrast, relatively high proportions of organic P were found in soil samples from unfertilised Sodosol sites. On average, soil from Sodosol sites contained 37.5% organic P (combined monoester P and diester P), while those from Dermosol and Ferrosol sites contained 31.7% and 25.8%, respectively. Of these, the highest monoester phosphate proportions of 44.6% (site M3) and 46.4% (site M4) were found in Sodosol sites with no recent P inputs, but the highest proportion of diester phosphate (5.7%) was found in an unclassified grey sandy loam Dermosol. The higher organic P concentrations in soil from Sodosol sites may be associated with more regular moisture input from both rainfall and boarder-check (flood) irrigation. The highest level of pyrophosphate (8.5%) was also found in a grey/yellow Sodosol. Overall, the results indicate that P speciation in the Australian soils is strongly influenced by soil type, fertiliser P application rate and timing, and moisture variations. |
Rights: | © 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/). |
DOI: | 10.3390/app6020031 |
Published version: | http://dx.doi.org/10.3390/app6020031 |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest 3 |
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hdl_109631.pdf | Published Version | 1.08 MB | Adobe PDF | View/Open |
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