SSSAJ Journal of Natural Resources and Life Sciences Education
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Published online 13 February 2009
Published in Soil Sci Soc Am J 73:449-452 (2009)
DOI: 10.2136/sssaj2008.0191
© 2009 Soil Science Society of America
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SOIL PHYSICS

Evaluation of Automotive Varnish as a Coating for Density Measurements of Soil Clods

B. G. de Almeidaa,b, A. P. da Silvaa, S.R. Rainec,* and G.C. Figueiredoa

a Escola Superior de Agric. Luiz de Queiroz, Dep. de Ciência do Solo, Universidade de São Paulo, Piracicaba-SP, Brazil
b Universidade Federal Rural de Pernambuco, Dep. de Agronomia, Recife-PE, Brazil
c National Centre for Engineering in Agriculture, Faculty of Engineering and Surveying, Univ. of Southern Queensland, Toowoomba, Australia

* Corresponding author (raine{at}usq.edu.au).

Saran F-310 resin (Dow Chemical Co, Midland, MI) has been widely used to coat soil clods for density and size measurements; however, the manufacturer has recently stopped producing this resin and supplies are difficult to obtain. Hence, we evaluated the feasibility of using Lazzudur 7502 (Sherwin-Williams, Cleveland, OH) automotive varnish to coat soil clods for density measurement. Preliminary evaluations showed that immersion of clods in the varnish did not affect clod cohesion and that a single immersion in Lazzudur with 30 min of post-immersion drying produced density results not significantly (P < 0.05) different to those obtained using saran. This technique was tested across seven soils and no significant (P < 0.05) difference was found in the density of the clods measured using the two coating methods. This work suggests that automotive varnish can be used as an alternative to saran resin for clod density measurements.






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