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1273. Chang, C. and C.W. Lindwall. 1989. Long-term minimum tillage practices affect soil physical properties of chernozemic clay loam.. Can. J. Soil Sci. 69:443-449.
2625. Hoag, D., H. Hinman and T. Hoffman. 1984. 1984 costs of alternative tillage systems, Central Whitman Co., WA. WSU Ext. Serv., Ext. Bull. #850.
Compares the cost of conventional and minimum tillage for a summer fallow-winter wheat-spring barley rotation. 15 to 18 inches of annual precip.