5Cooper A W,Trouse J A C,Dumas W T. Controlled traffic in row crop production[A]. In:Proceedings of 7^th International Congress on Agricultural Engineering[C]. Gatton: Queensland University Gatton Collage, 1995.1-6.
6Chamen W C T, Vermeulen G D, Campbell D J, et al. Reduction of traffic systems: Tillage and traffic in crop production[A]. In: Proceed-ings of the 11^th International Conference of the International Soil and Tillage Research Organization[C]. Edinburgh, 1988. 227-232.
7Raper R L, Reeves D W, Burt E C, et al, Conservation tillage and traffic effects on soil condition[J]. Trans of the ASAE, 1994,37 (3):763-768.
8Lamers J G, Perdok U D, Lumkes L M, et al, Controlled traffic farming systems in the Netherlands[J]. Soil and Tillage Research, 1986,8:65-76.