Chemical behavior of fluid and granular Mn and Zn fertilisers in alkaline soils

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dc.contributor.authorHettiarachchi, G.
dc.contributor.authorLombi, E.
dc.contributor.authorMcLaughlin, M.
dc.contributor.authorChittleborough, D.
dc.contributor.authorJohnston, C.
dc.date.issued2010
dc.description.abstractThe grain yield benefits of applying micronutrient fluid fertilisers over conventional granular products in calcareous sandy loam soils have been agronomically demonstrated. An understanding of the fundamental mechanisms and reactions occurring following application of these products to soils is critical to improve fertiliser management. We therefore examined the diffusion, solubility, and potential availability of manganese (Mn) and zinc (Zn) from both granular and fluid forms of Mn and Zn fertiliser in an alkaline calcareous and alkaline non-calcareous soil using laboratory incubation experiments in conjunction with an isotopic dilution technique with ⁵⁴Mn and ⁶⁵Zn. Enhanced mobility, solubility, and/or potential availability of Mn and Zn from fluid fertilisers were observed in comparison to Mn or Zn from granular fertilisers in both soils after 5 weeks of incubation. Differential behaviour of fluid and granular fertilisers for Mn and Zn appeared to be independent of their effects on soil pH. Most (~90%) of the Mn in granular fertiliser dissolved and diffused out of the granule but was retained within 4 mm of the point of granular placement, whereas most (~85%) of the Zn in the granular Zn fertiliser source remained in the granule. Our data suggest that the superior agronomic effectiveness of fluid Mn and Zn fertilisers observed in calcareous soils under field conditions may have resulted from the enhanced diffusion (Mn) and/or solubility/availability (Mn, Zn) of these micronutrients in soil when applied in fluid form.
dc.description.statementofresponsibilityG. M. Hettiarachchi, E. Lombi, M. J. McLaughlin, D. J. Chittleborough and C. Johnston
dc.identifier.citationSoil Research, 2010; 48(3):238-247
dc.identifier.doi10.1071/SR09051
dc.identifier.issn0004-9573
dc.identifier.issn1446-568X
dc.identifier.orcidMcLaughlin, M. [0000-0001-6796-4144]
dc.identifier.urihttp://hdl.handle.net/2440/61695
dc.language.isoen
dc.publisherC S I R O Publishing
dc.relation.granthttp://purl.org/au-research/grants/arc/LP0454086
dc.relation.granthttp://purl.org/au-research/grants/arc/LP0454086
dc.rights© CSIRO 2010
dc.source.urihttps://doi.org/10.1071/sr09051
dc.titleChemical behavior of fluid and granular Mn and Zn fertilisers in alkaline soils
dc.typeJournal article
pubs.publication-statusPublished

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