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Title: Isotopic determination of sulfur (S) availability from S coated mono-ammonium phosphate
Contributor(s): McLaren, Tim (author); Guppy, Christopher (author)orcid ; Blair, Graeme (author)
Publication Date: 2010
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Abstract: An evaluation of three novel elemental sulfur (S°) coated mono-ammonium phosphate (MAP) products ((MAP with coarse (75-100μm) S° coating (MAP75), MAP with fine (17-24μm) S° coating (MAP17), and MAP with 1/3 coarse S°, 1/3 fine S°, and 1/3 sulfate coating (MAPM)) was undertaken in an intact core pot trial using red clover ('Trifolium pratense') and compared with single superphosphate (SSP). Sulfur (S) uptake from coated S sources was not significantly different (p<0.05) from SSP after 120 days of growth. Between 34% and 53% plant S was derived from the fertiliser sources. There was no significant difference in % fertiliser recovery between MAPM and SSP at either harvest and at both harvests fertiliser S recovery was in the order MAP < MAP75 < MAP17 < MAPM < SSP. The key finding was that a MAP coated with 1/3 sulfate and 2/3 S° was able to supply clover with the same amount of S, at the same rate, as SSP over 120 days. Under leaching conditions, this availability may result in slower, longer release of S as the coarser fraction slowly meets plant demands and protects added S from leaching.
Publication Type: Conference Publication
Conference Name: 19th World Congress of Soil Science, Brisbane, Australia, 1st - 6th August, 2010
Conference Details: 19th World Congress of Soil Science, Brisbane, Australia, 1st - 6th August, 2010
Source of Publication: Proceedings of the 19th World Congress of Soil Science: Soil Solutions for a Changing World, p. 126-128
Publisher: International Union of Soil Sciences and Australian Society of Soil Science Inc
Place of Publication: Brisbane, Australia
Field of Research (FOR): 070306 Crop and Pasture Nutrition
050304 Soil Chemistry (excl Carbon Sequestration Science)
Peer Reviewed: Yes
HERDC Category Description: E1 Refereed Scholarly Conference Publication
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School of Environmental and Rural Science

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