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Changes in Long-Term No-Till Corn Growth and Yield under Different Rates of Stover Mulch

^a Carbon Management and Sequestration Center, FAES/OARDC, School of Natural Resources, The Ohio State Univ., 210 Kottman Hall, 2021 Coffey Rd., Columbus, OH 43210-1085
^b Environmental Sci. Div., Oak Ridge National Lab., Oak Ridge, TN 37831
^c USDA-ARS, North Appalachian Experimental Watersheds, P.O. Box 488, Coshocton, OH 43812

View larger version (19K): [in a new window]   Fig. 1. Corn height as a function of days after emergence under six stover treatments for three no-till sites in Ohio including Coshocton, Hoytille, and South Charleston. The six treatments including 0 (T0), 25 (T25), 50 (T50), 75 (T75), 100 (T100), and 200 (T200)% of corn stover correspond to 0, 1.25, 2.50, 3.75, 5.00, and 10.00 Mg ha–1 of stover, respectively. The error bars represent the LSD(0.05) for treatment comparisons.

View larger version (30K): [in a new window]   Fig. 2. Relationship between corn height and six stover rates (0, 1.25, 2.50, 3.75, 5.00, and 10.00 Mg ha–1) at 8 d after emergence and silking stage under three no-till sites in Ohio.

View larger version (28K): [in a new window]   Fig. 3. Variations in soil water content from corn emergence to silking stage for three no-till sites in Ohio. The six treatments including 0 (T0), 25 (T25), 50 (T50), 75 (T75), 100 (T100), and 200 (T200)% of corn stover correspond to 0, 1.25, 2.50, 3.75, 5.00, and 10.00 Mg ha–1 of stover, respectively. The error bars represent the LSD(0.05) for treatment comparisons.

View larger version (28K): [in a new window]   Fig. 4. Variations in soil temperature from corn emergence to silking stage for three no-till sites in Ohio. The six treatments including 0 (T0), 25 (T25), 50 (T50), 75 (T75), 100 (T100), and 200 (T200)% of corn stover correspond to 0, 1.25, 2.50, 3.75, 5.00, and 10.00 Mg ha–1 of stover, respectively. The error bars represent the LSD(0.05) for treatment comparisons.

View larger version (29K): [in a new window]   Fig. 5. Corn height as a function of changes in soil temperature for three no-till sites in Ohio. The six treatments including 0 (T0), 25 (T25), 50 (T50), 75 (T75), 100 (T100), and 200 (T200)% of corn stover correspond to 0, 1.25, 2.50, 3.75, 5.00, and 10.00 Mg ha–1 of stover, respectively.

View larger version (31K): [in a new window]   Fig. 6. Corn height as a function of changes in soil water content for three no-till sites in Ohio. The six treatments including 0 (T0), 25 (T25), 50 (T50), 75 (T75), 100 (T100), and 200 (T200)% of corn stover correspond to 0, 1.25, 2.50, 3.75, 5.00, and 10.00 Mg ha–1 of stover, respectively.

View larger version (19K): [in a new window]   Fig. 7. Corn (A) grain and (B) stover yield under six stover treatments for three no-till sites in Ohio. The error bars represent the LSD0.05 for treatment comparisons. The six rates of stover retention of 0, 1.25, 2.50, 3.75, 5.00, and 10.00 Mg ha–1 correspond to 0 (T0), 25 (T25), 50 (T50), 75 (T75), 100 (T100), and 200 (T200) % of corn stover, respectively.