I am placing the link information for this article here with the thought that easier access to articles such as this will encourage reading and open discussion. This is also an open invitation for you to write a precis on this article (or, any other article that you find necessary or interesting)….
Older articles such as this one can be used for comparison with the data in newer articles.
Article: Field-Scale Variability of Soil Properties in Central Iowa Soils pdf
Author: C.A. Cambardella, T.B. Moorman, J.M. Novak, T.B. Parkin, D.I. Karlen, R.F. Turco and A.E. Konopka
Journal: Soil Science Society of America Journal. Vol. 58: pages 1501-1511.
Published in: 1994
My copy was downloaded on November 22, 2014 from http://www.ars.usda.gov/SP2UserFiles/Place/60820000/Manuscripts/1994/Man330.pdf