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Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/61695

Type: Journal article
Title: Chemical behavior of fluid and granular Mn and Zn fertilisers in alkaline soils
Author: Hettiarachchi, Ganga Mali
Lombi, Enzo
McLaughlin, Michael John
Chittleborough, David James
Johnston, Caroline
Citation: Australian Journal of Soil Research, 2010; 48(3):238-247
Publisher: C S I R O Publishing
Issue Date: 2010
ISSN: 0004-9573
School/Discipline: School of Earth and Environmental Sciences : Soil and Land Systems
Statement of
Responsibility: 
G. M. Hettiarachchi, E. Lombi, M. J. McLaughlin, D. J. Chittleborough and C. Johnston
Abstract: The 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.
Rights: © CSIRO 2010
RMID: 0020098228
DOI: 10.1071/SR09051
Appears in Collections:Environment Institute Publications
Soil and Land Systems publications
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