1. ASAE, 1994. Soil Cone Penetrometer. ASAE S313.2, Standards Engineering Practices Data. American Society of Agricultural Engineers, p. 687.
2. Soil crusts and cotton emergence relationships;Bilbro;Trans. ASAE,1982
3. Subsoil compaction by vehicles with high axle load—extent, persistence and crop response;Honsson;Soil Till. Res.,1994
4. Soil compaction and crop response to wheat/soybean interseeding;Khalilian;Trans. ASAE,1991
5. Kok, H., Taylor, R.K., Lamond, R.E., Kessen, S., 1996. Soil Compaction Problems and Solutions Cooperative Extension Service. Kansas State University, Manhattan, KN.