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1 한경화, "토양 경도 측정방법간 비교연구" 한국토양비료학회 44 (44): 344-346, 2011
2 Kumar A, "Soil cone index in relation to soil texture, moisture content, and bulk density for no-tillage and conventional tillage" 14 : 26-37, 2012
3 Raper RL, "Soil compaction: How to do it, undo it, or avoid doing it" American Society of Agricultural and Biological Engineers 2006
4 Hamza M, "Soil compaction in cropping systems: a review of the nature, causes and possible solutions" 82 : 121-145, 2005
5 Atkinson D, "Root methods: a handbook" Springer 1-32, 2000
6 Chen G., "Root growth and yield of maize as affected by soil compaction and cover crops" 117 : 17-27, 2011
7 한경화, "Relationship between Water Stable Aggregate and Macroporosity in Upland Soils Calculated by Fragmentation Fractal Dimension" 한국토양비료학회 42 (42): 58-64, 2009
8 R foundation, "R version 2. 13. 0., The R foundation for statistical computing"
9 Choi SW, "Prediction of tillage workability by cone index" 25 (25): 195-202, 2000
10 Tekeste MZ, "Optimal spatial sampling schemes for mapping soil strength on a Southeastern US soils"
11 NIAST, "Method of soil and plant analysis" Institute of Agricultural Science and Technology 2000
12 Schoeneberger PJ, "Field book for describing and sampling soils, Version 2.0. Natural Resources Conservation Service" National Soil Survey Center 2002
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16 Raper R, "Agricultural traffic impacts on soil" 42 : 259-280, 2005
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18 Håkansson I, "A method for characterizing the state of compactness of the plough layer" 16 : 105-120, 1990