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Long-Term Effects of Tillage on Soil Chemical Properties and Grain Yields of a Dryland Winter Wheat–Sorghum/Corn–Fallow Rotation in the Great Plains

^a Dep. of Agron. and Hortic., Univ. of Nebraska–Lincoln, West Central Res. and Ext. Cent., 461 West University Dr., North Platte, NE 69101
^b Dep. of Agron. and Hortic., Univ. of Nebraska–Lincoln, Panhandle Res. and Ext. Cent., 4502 Ave. I, Scottsbluff, NE 69361
^c Dep. of Agron. and Hortic., Univ. of Nebraska–Lincoln, 387 Plant Science, Lincoln, NE 68583. A contribution of the University of Nebraska Agricultural Research Division, Lincoln, NE 68583

View larger version (12K): [in a new window]   Fig. 1. Titration curve for the no-till treatment. Each point is averaged over depth (0–5, 5–10, and 10–15 cm), four replications, and three crop-year strips.