Determining the particle size range of organomineral fertilisers based on the spreading characteristics of the material

Antille, D. L. and Gallar-Redondo, L. and Godwin, R. J. (2013) Determining the particle size range of organomineral fertilisers based on the spreading characteristics of the material. In: American Society of Agricultural and Biological Engineers Annual International Meeting (ASABE 2013), 21-24 Jul 2013, Kansas City, MO. United States.

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A. The aim of this work was to determine the particle size range of two organomineral fertilisers (OMF) that may enable broadcast application with standard fertiliser spreading equipment using conventional tramlines spacing. A theoretical model was developed which predicts the trajectory of individual fertiliser particles off-the-disc. The drag coefficient was estimated for small time steps (10-6 s) in the trajectory of the particle as a function of the Reynolds number. For the range of initial velocities (from 20 to 40 m s-1) and particle densities (from 1250 to 1500kg m-3) investigated, the model showed that the particle size range for OMF should be between 1.10 and 5.50 mm in diameter. Given the assumptions made in the analysis, this size range is expected to match, approximately, the minimum and maximum landing distances of individual particles of urea (size range: 1.00 to 5.00 mm). It was suggested that OMF should have about 80% of the particles in the range of 2.25 to 4.40mm in diameter. Due to the characteristics of the materials, spreading OMF with spinning discs applicators may be restricted to tramlines spaced at a maximum of 18m apart; especially, when some degree of overlapping is required between two adjacent bouts. The model presented herein requires validation with data obtained from spreading tests.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: © (2013) by the American Society of Agricultural & Biological Engineers. For information about securing permission to reprint or reproduce a technical presentation, please contact ASABE at or 269-932-7004 (2950 Niles Road, St. Joseph, MI 49085-9659 USA). Paper # 131620197
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 08 Jul 2014 01:35
Last Modified: 06 Mar 2017 03:13
Uncontrolled Keywords: biosolids granules; fertiliser particle trajectory; fertiliser spreading; organomineral fertilisers (OMF); particle diameter
Fields of Research : 07 Agricultural and Veterinary Sciences > 0701 Agriculture, Land and Farm Management > 070104 Agricultural Spatial Analysis and Modelling
01 Mathematical Sciences > 0103 Numerical and Computational Mathematics > 010301 Numerical Analysis
07 Agricultural and Veterinary Sciences > 0799 Other Agricultural and Veterinary Sciences > 079902 Fertilisers and Agrochemicals (incl. Application)
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970107 Expanding Knowledge in the Agricultural and Veterinary Sciences
Identification Number or DOI: doi:10.13031/aim.20131620197

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